Earned Media Value Calculator

Earned Media Value Calculator & Guide body { font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; background-color: #f8f9fa; color: #333; line-height: 1.6; margin: 0; padding: 0; } .container { max-width: 960px; margin: 20px auto; padding: 20px; background-color: #fff; border-radius: 8px; box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1); } header { background-color: #004a99; color: #fff; padding: 20px 0; text-align: center; border-radius: 8px 8px 0 0; margin-bottom: 20px; } header h1 { margin: 0; font-size: 2.5em; font-weight: 700; } .subtitle { font-size: 1.1em; opacity: 0.9; } #calculator-wrapper { background-color: #ffffff; padding: 30px; border-radius: 8px; box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.05); margin-bottom: 30px; } .loan-calc-container h2 { text-align: center; color: #004a99; margin-bottom: 25px; font-size: 1.8em; } .input-group { margin-bottom: 20px; font-size: 0.95em; } .input-group label { display: block; margin-bottom: 8px; font-weight: 600; color: #555; } .input-group input[type="number"], .input-group input[type="text"], .input-group select { width: calc(100% – 22px); padding: 12px 10px; border: 1px solid #ccc; border-radius: 5px; font-size: 1em; box-sizing: border-box; transition: border-color 0.3s ease; } .input-group input:focus, .input-group select:focus { border-color: #004a99; outline: none; } .input-group .helper-text { font-size: 0.85em; color: #777; margin-top: 5px; display: block; } .input-group .error-message { color: #dc3545; font-size: 0.8em; margin-top: 5px; min-height: 1.2em; /* Prevent layout shifts */ } .button-group { text-align: center; margin-top: 30px; } .button-group button { padding: 10px 25px; margin: 0 10px; border: none; border-radius: 5px; cursor: pointer; font-size: 1em; font-weight: 600; transition: background-color 0.3s ease, transform 0.2s ease; } .calculate-button { background-color: #004a99; color: white; } .calculate-button:hover { background-color: #003366; transform: translateY(-1px); } .reset-button { background-color: #6c757d; color: white; } .reset-button:hover { background-color: #5a6268; transform: translateY(-1px); } #results-wrapper { margin-top: 30px; padding: 25px; background-color: #e9ecef; border-radius: 8px; text-align: center; } #results-wrapper h3 { color: #004a99; margin-bottom: 20px; font-size: 1.5em; } .result-item { margin-bottom: 15px; font-size: 1.1em; } .result-item strong { color: #004a99; } .primary-result { font-size: 2em; font-weight: bold; color: #28a745; background-color: #e0f7fa; padding: 15px 25px; border-radius: 5px; display: inline-block; margin-bottom: 20px; } .formula-explanation { font-size: 0.9em; color: #666; margin-top: 15px; padding-top: 15px; border-top: 1px dashed #ccc; } .chart-container { margin-top: 30px; padding: 25px; background-color: #e9ecef; border-radius: 8px; } .chart-container h3 { text-align: center; color: #004a99; margin-bottom: 20px; font-size: 1.5em; } canvas { display: block; margin: 0 auto; max-width: 100%; height: auto !important; /* Ensure it scales */ } .table-container { margin-top: 30px; padding: 25px; background-color: #e9ecef; border-radius: 8px; } .table-container h3 { text-align: center; color: #004a99; margin-bottom: 20px; font-size: 1.5em; } table { width: 100%; border-collapse: collapse; margin-top: 15px; } th, td { padding: 12px 15px; text-align: left; border-bottom: 1px solid #ddd; } th { background-color: #004a99; color: white; font-weight: bold; } tr:nth-child(even) { background-color: #f2f2f2; } tr:hover { background-color: #ddd; } .copy-button { background-color: #ffc107; color: #212529; padding: 10px 20px; border: none; border-radius: 5px; cursor: pointer; font-size: 1em; transition: background-color 0.3s ease, transform 0.2s ease; margin-left: 10px; } .copy-button:hover { background-color: #e0a800; transform: translateY(-1px); } .article-content { margin-top: 30px; background-color: #fff; padding: 30px; border-radius: 8px; box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1); } .article-content h2 { color: #004a99; border-bottom: 2px solid #004a99; padding-bottom: 5px; margin-top: 30px; margin-bottom: 20px; font-size: 1.8em; } .article-content h3 { color: #004a99; margin-top: 25px; margin-bottom: 15px; font-size: 1.4em; } .article-content p, .article-content ul, .article-content ol { margin-bottom: 15px; font-size: 1em; } .article-content ul, .article-content ol { padding-left: 25px; } .article-content li { margin-bottom: 10px; } .article-content .highlight { background-color: #fff3cd; padding: 10px; border-left: 4px solid #ffc107; margin: 15px 0; } .article-content a { color: #004a99; text-decoration: none; font-weight: 500; } .article-content a:hover { text-decoration: underline; } .faq-item { margin-bottom: 15px; } .faq-item strong { color: #004a99; display: block; margin-bottom: 5px; cursor: pointer; /* Indicate it's clickable */ } .faq-item p { margin-left: 15px; font-size: 0.95em; color: #555; display: none; /* Hidden by default */ } .faq-item.open p { display: block; } .related-tools ul { list-style: none; padding: 0; } .related-tools li { margin-bottom: 15px; background-color: #f1f1f1; padding: 10px 15px; border-radius: 5px; } .related-tools a { font-weight: 600; } .related-tools span { font-size: 0.9em; color: #666; display: block; margin-top: 5px; } .footer { text-align: center; margin-top: 40px; padding: 20px; font-size: 0.9em; color: #777; } @media (max-width: 768px) { .container { margin: 10px; padding: 15px; } header h1 { font-size: 2em; } .button-group button { width: 80%; margin: 10px 0; } .copy-button { width: 80%; margin: 10px 0; } }

Earned Media Value Calculator

Quantify the Value of Organic Brand Mentions and Shares

Calculate Your Earned Media Value (EMV)

Total count of unpaid social media posts, articles, or reviews mentioning your brand.
The typical number of followers or views for each platform where your brand is mentioned.
The percentage of the audience that interacts (likes, comments, shares) with a typical post.
The cost to reach 1000 people through paid advertising (e.g., $10 CPM means $0.01 per person). Enter value per 1000 users.

Your Results

Total Potential Reach: 0
Total Engagements: 0
EMV per Engagement: 0
Estimated Earned Media Value (EMV): $0
Formula Used: EMV = (Total Potential Reach * Engagement Rate * CPM Value) / 1000
*(Note: CPM Value is the cost to reach 1000 people. We divide by 1000 to get the value per person before multiplying by total reach.)*

EMV Breakdown by Reach Component

Key Calculation Components

Component Value Description
Mentions/Shares 0 Total organic brand mentions or social shares.
Avg. Reach/Mention 0 Average audience size per mention.
Engagement Rate 0% Percentage of audience interacting with mentions.
Audience Value (CPM) 0 Estimated cost to reach 1000 people via ads.
Total Potential Reach 0 Sum of audiences across all mentions.
Total Engagements 0 Calculated interactions based on reach and rate.

What is Earned Media Value (EMV)?

Earned Media Value (EMV) is a metric used in marketing and public relations to quantify the value of organic brand mentions and social media shares. Unlike paid media (advertising) or owned media (your own channels), earned media refers to the exposure your brand receives from third-party sources. This includes mentions in news articles, blog posts, social media shout-outs, reviews, and shares by customers or influencers who are not being paid for their endorsement. The earned media value calculator helps businesses estimate this value.

Essentially, EMV attempts to put a dollar figure on the positive buzz and visibility generated by word-of-mouth, social sharing, and organic press coverage. It's a crucial metric for understanding the effectiveness of PR campaigns, influencer marketing (even unpaid collaborations), and overall brand reputation management. By estimating what it would cost to achieve similar exposure through paid advertising, marketers can gauge the true impact of their earned media efforts.

Who should use it?

  • Marketing & PR Teams: To measure the success of campaigns and justify budgets.
  • Brand Managers: To understand brand perception and organic reach.
  • Social Media Managers: To track the impact of community engagement and viral content.
  • Content Creators & Influencers: To demonstrate the value of their organic reach to potential brand partners.
  • Small Business Owners: To assess the effectiveness of their efforts in generating organic buzz without direct ad spend.

Common Misconceptions:

  • EMV is Direct Revenue: EMV is an estimation of exposure value, not direct sales. While valuable exposure can lead to sales, EMV doesn't directly measure conversion rates.
  • EMV is Always Accurate: EMV calculations rely on assumptions (like CPM value and engagement rates) which can vary greatly. It's a benchmark, not an exact science.
  • High EMV Guarantees Success: Positive mentions are valuable, but the sentiment of the mention matters. A high EMV from negative press is not a positive outcome.

{primary_keyword} Formula and Mathematical Explanation

The core idea behind calculating Earned Media Value (EMV) is to determine how much it would cost to achieve a similar level of exposure and engagement through paid advertising channels. While various methodologies exist, a common and straightforward approach utilizes a Cost Per Mille (CPM) basis. CPM represents the cost an advertiser pays for one thousand views or impressions of an advertisement. The formula can be broken down:

1. Calculate Total Potential Reach: This is the sum of the audiences exposed to your brand through each earned media mention.

Total Potential Reach = Number of Mentions/Shares × Average Audience Reach per Mention

2. Calculate Total Engagements: This estimates how many people interacted with the content mentioning your brand.

Total Engagements = Total Potential Reach × (Average Engagement Rate / 100)

3. Calculate EMV: This is the estimated cost to reach the total audience via paid ads, adjusted for engagement. The CPM value is usually given per 1000 people, so we need to convert it to a per-person value.

EMV = (Total Potential Reach × CPM Value) / 1000

Alternatively, some models factor in engagement rate more directly, but the CPM approach is widely adopted for its simplicity.

Variable Explanations

Variable Meaning Unit Typical Range
Number of Mentions/Shares Total count of organic brand mentions or social shares. Count 1 to 10,000+
Average Audience Reach per Mention The typical number of followers or views for each platform/source mentioning the brand. Count 10 to 1,000,000+
Average Engagement Rate (%) The percentage of the audience that interacts (likes, comments, shares) with a typical post or mention. Percentage (%) 0.5% to 10%+ (highly variable by platform and content)
Estimated Value of Audience (CPM Basis) The cost to reach 1000 people through paid advertising on comparable platforms. Represents the perceived value of an audience member. Currency (e.g., $) per 1000 people $5 to $50+ (varies widely by industry, platform, targeting)
Total Potential Reach The aggregate audience size across all earned mentions. Count Calculated
Total Engagements The total number of interactions generated from the earned media mentions. Count Calculated
Earned Media Value (EMV) The estimated monetary value of the earned media exposure, based on paid media benchmarks. Currency (e.g., $) Calculated

Practical Examples (Real-World Use Cases)

Example 1: Successful Product Launch Buzz

A new sustainable fashion brand, "EcoThreads," launches a new line. They engage with micro-influencers and encourage user-generated content.

  • Inputs:
    • Number of Organic Mentions/Shares: 150
    • Average Audience Reach per Mention: 3,000
    • Average Engagement Rate (%): 4.5%
    • Estimated Value of Audience (CPM Basis): $15 (meaning $15 per 1000 people)
  • Calculations:
    • Total Potential Reach = 150 * 3,000 = 450,000
    • Total Engagements = 450,000 * (4.5 / 100) = 20,250
    • EMV = (450,000 * $15) / 1000 = $6,750
  • Interpretation: The organic buzz generated by EcoThreads' launch, through influencer and user content, is estimated to be worth $6,750 in equivalent paid advertising value. This highlights the effectiveness of their influencer outreach and UGC campaign.

Example 2: Positive Restaurant Review

A popular local restaurant, "The Gilded Spoon," is featured in a positive blog post and receives numerous social shares from diners.

  • Inputs:
    • Number of Organic Mentions/Shares: 50 (including the blog post and subsequent shares)
    • Average Audience Reach per Mention: 8,000 (higher due to the blog's reach and popular foodie accounts sharing)
    • Average Engagement Rate (%): 5%
    • Estimated Value of Audience (CPM Basis): $12
  • Calculations:
    • Total Potential Reach = 50 * 8,000 = 400,000
    • Total Engagements = 400,000 * (5 / 100) = 20,000
    • EMV = (400,000 * $12) / 1000 = $4,800
  • Interpretation: The positive blog feature and diner shares provided "The Gilded Spoon" with approximately $4,800 worth of valuable exposure. This suggests the content was highly shareable and reached a significant audience interested in dining out.

How to Use This Earned Media Value Calculator

Our free earned media value calculator is designed for simplicity and speed. Follow these steps to get your EMV estimate:

  1. Gather Your Data: Before using the calculator, you'll need the following key pieces of information:
    • Number of Organic Mentions/Shares: Count how many times your brand was mentioned organically across all relevant platforms (social media, blogs, news, forums) within a specific timeframe.
    • Average Audience Reach per Mention: Estimate the average number of people who saw each mention. For social media, this is often the average follower count of the accounts mentioning you. For blogs or news sites, it's the average unique visitors or page views.
    • Average Engagement Rate (%): Find the typical engagement rate for the platforms where you're being mentioned. This is (Total Likes + Comments + Shares) / Reach * 100. If this data is hard to find per mention, use the average engagement rate of the platform or the accounts mentioning you.
    • Estimated Value of Audience (CPM Basis): Determine what it would cost to reach 1000 people through paid ads on similar platforms. A common benchmark is $10 CPM, meaning $10 for 1000 impressions. Enter this value (e.g., 10). The calculator will convert this to a per-person value internally.
  2. Input Your Data: Enter the collected numbers into the corresponding fields in the calculator. Ensure you input whole numbers for counts and percentages for the engagement rate.
  3. Calculate: Click the "Calculate EMV" button. The calculator will instantly process your inputs.
  4. Review Results:
    • Primary Result: The large, highlighted number is your estimated Earned Media Value (EMV) in dollars.
    • Intermediate Values: See the Total Potential Reach, Total Engagements, and EMV per Engagement. These help understand how the final EMV was derived.
    • Chart & Table: Visualize the breakdown of your EMV components and review the key figures in a structured table.
  5. Interpret & Decide: Use the EMV figure to understand the strength of your organic visibility. A higher EMV suggests your brand is generating significant buzz that would be costly to replicate through advertising. Use this insight to refine your content marketing strategy and PR efforts.
  6. Copy Results: Use the "Copy Results" button to easily share your findings or save them for reporting.
  7. Reset: Click "Reset" to clear all fields and start over with new data.

Key Factors That Affect Earned Media Value Results

While the EMV calculator provides a quantitative estimate, several qualitative and contextual factors significantly influence the *true* value of earned media:

  1. Sentiment Analysis: The EMV calculation doesn't differentiate between positive, neutral, or negative mentions. A high EMV derived from negative press can be detrimental. Positive sentiment exponentially increases the value of the exposure.
  2. Platform Relevance: A mention on a highly authoritative industry blog or a mainstream news outlet carries more weight than a mention on a small, niche forum, even if the reach numbers are similar. The audience quality matters.
  3. Influencer Authority & Trust: Mentions from highly respected or trusted figures (micro or macro-influencers) often yield higher engagement and conversion potential, making the earned media more valuable than a similar reach from a less credible source.
  4. Content Quality & Context: Was the mention organic and authentic, or did it feel forced? Was the content itself engaging and well-produced? High-quality, naturally integrated mentions are more impactful.
  5. Call to Action (CTA): Did the earned media include a link, a specific offer, or encourage a specific action? Mentions with clear CTAs can drive more direct results and increase their effective value beyond simple reach.
  6. Demographics Alignment: Does the audience reached by the earned media align with your target customer demographic? Exposure to an irrelevant audience has a lower practical value, even if the reach numbers are high.
  7. Shareability & Virality Potential: Some content naturally encourages more sharing. A mention that gets amplified through multiple rounds of sharing by new audiences can drastically increase its EMV, exceeding initial reach estimates.
  8. Competitive Landscape: The value of a CPM benchmark can shift based on your industry. If your competitors spend heavily on ads, the CPM might be higher, thus increasing your calculated EMV. Conversely, in a low-ad-spend industry, the benchmark might be lower.

Frequently Asked Questions (FAQ)

What is the most common way to calculate EMV?

The most common method involves using a Cost Per Mille (CPM) benchmark. You estimate the cost to reach 1,000 people via paid ads and apply that to the total reach generated by earned media mentions. Variations exist, but the CPM approach is widely accepted for its simplicity.

Is EMV the same as ROI?

No. Return on Investment (ROI) measures the profitability of a specific campaign or investment (Revenue – Cost) / Cost. EMV measures the *estimated value of exposure* based on paid media benchmarks. While high EMV can contribute to positive ROI, they are distinct metrics.

How do I find the "Estimated Value of Audience (CPM Basis)"?

You can estimate this by looking at the average CPM rates for advertising on platforms relevant to your industry (e.g., Facebook Ads, Google Ads, LinkedIn Ads). Many advertising platforms provide average CPM ranges. If unsure, use a conservative industry average (e.g., $10-$20 CPM).

Should I include paid influencer posts in EMV?

No. EMV specifically measures *earned* media – exposure you receive organically without direct payment. Paid influencer posts fall under paid media.

What timeframe should I use for calculating EMV?

Choose a relevant timeframe for your analysis, such as a specific campaign duration (e.g., a product launch week), a month, or a quarter. Consistency in your chosen timeframe is key for comparative analysis.

How accurate is the EMV calculation?

EMV is an estimation. Its accuracy depends heavily on the quality of your input data (especially average reach and engagement rates) and the relevance of the CPM benchmark used. It serves as a valuable benchmark rather than a precise financial figure.

Can EMV be negative?

The standard EMV calculation, based on reach and CPM, cannot be negative. However, if you were to incorporate a sentiment score where negative mentions have a penalty, you could theoretically arrive at a negative adjusted value. But typically, EMV represents a positive potential value.

What if a mention has very high reach but low engagement?

This is where context matters. While the calculator uses averages, a high-reach, low-engagement mention might indicate the content wasn't compelling to the audience, or the audience is less likely to interact. You might adjust your average engagement rate downwards for future calculations if this becomes a trend, or investigate the content strategy behind such mentions.

© 2023 Your Company Name. All rights reserved.
var chartInstance = null; // Global variable to hold chart instance function getElement(id) { return document.getElementById(id); } function validateInput(value, id, min, max, name) { var errorElement = getElement(id + 'Error'); if (value === null || value === ") { errorElement.textContent = name + ' cannot be empty.'; return false; } var numberValue = parseFloat(value); if (isNaN(numberValue)) { errorElement.textContent = name + ' must be a valid number.'; return false; } if (min !== null && numberValue max) { errorElement.textContent = name + ' cannot be greater than ' + max + '.'; return false; } errorElement.textContent = "; // Clear error message return true; } function formatCurrency(value) { if (isNaN(value) || value === null) return "$0"; return "$" + value.toFixed(2).replace(/\d(?=(\d{3})+\.)/g, '$&,'); } function formatNumber(value) { if (isNaN(value) || value === null) return "0"; return value.toLocaleString(); } function calculateEMV() { // Clear previous errors var errors = document.querySelectorAll('.error-message'); for (var i = 0; i 0) ? emv / totalEngagements : 0; // Update Results Display getElement('totalReach').textContent = formatNumber(totalReach); getElement('totalEngagements').textContent = formatNumber(totalEngagements); getElement('emvPerEngagement').textContent = formatCurrency(emvPerEngagement); getElement('emvResult').textContent = formatCurrency(emv); // Update Table getElement('tableMentions').textContent = formatNumber(mentions); getElement('tableAvgReach').textContent = formatNumber(averageReach); getElement('tableEngagementRate').textContent = engagementRate.toFixed(1) + '%'; getElement('tableAdValue').textContent = formatCurrency(adValuePerThousand) + ' / 1000'; getElement('tableTotalReach').textContent = formatNumber(totalReach); getElement('tableTotalEngagements').textContent = formatNumber(totalEngagements); // Update Chart updateChart(totalReach, totalEngagements, emv); } function updateChart(totalReach, totalEngagements, emv) { var ctx = getElement('emvChart').getContext('2d'); // Clear previous chart if it exists if (chartInstance) { chartInstance.destroy(); } // Prepare data for the chart // We'll visualize components contributing to EMV. // Let's assume EMV is directly proportional to Total Reach and CPM value. // Engagement rate influences the *quality* of reach but the core value driver here is reach * value. // For visualization, let's show Total Reach vs. Total Engagements and perhaps relate EMV to Total Reach. var chartData = { labels: ['Total Potential Reach', 'Total Engagements', 'Estimated EMV'], datasets: [{ label: 'Audience Metrics', data: [totalReach, totalEngagements], backgroundColor: [ 'rgba(0, 74, 153, 0.6)', // Primary blue for Reach 'rgba(40, 167, 69, 0.6)' // Success green for Engagements ], borderColor: [ 'rgba(0, 74, 153, 1)', 'rgba(40, 167, 69, 1)' ], borderWidth: 1 }, // Add a second dataset to represent EMV, maybe as a line overlay or bar if scale permits // For simplicity, let's make EMV a separate bar dataset if scales are similar, or use a secondary y-axis // Given potential scale differences, let's use a simple bar chart showing EMV as a value { label: 'Earned Media Value ($)', data: [0, 0, emv], // Position EMV at the third label backgroundColor: 'rgba(255, 193, 7, 0.6)', // Warning yellow for EMV borderColor: 'rgba(255, 193, 7, 1)', borderWidth: 1 }] }; // Configuration for the chart var options = { responsive: true, maintainAspectRatio: false, // Allows control over height via CSS scales: { y: { beginAtZero: true, title: { display: true, text: 'Count / Value' } } }, plugins: { title: { display: true, text: 'Key Metrics Breakdown', font: { size: 16 } }, legend: { position: 'top', } } }; // Create the chart chartInstance = new Chart(ctx, { type: 'bar', // Use 'bar' type for multiple datasets easily data: chartData, options: options }); } function resetCalculator() { getElement('mentions').value = '100'; getElement('averageReach').value = '5000'; getElement('engagementRate').value = '3'; getElement('adValue').value = '10'; // Clear errors var errors = document.querySelectorAll('.error-message'); for (var i = 0; i < errors.length; i++) { errors[i].textContent = ''; } calculateEMV(); // Recalculate with default values } function copyResults() { var totalReach = getElement('totalReach').textContent; var totalEngagements = getElement('totalEngagements').textContent; var emvPerEngagement = getElement('emvPerEngagement').textContent; var emvResult = getElement('emvResult').textContent; var mentions = getElement('mentions').value; var averageReach = getElement('averageReach').value; var engagementRate = getElement('engagementRate').value; var adValue = getElement('adValue').value; var copyText = "Earned Media Value (EMV) Results:\n\n" + "Inputs:\n" + "- Organic Mentions/Shares: " + mentions + "\n" + "- Avg. Audience Reach: " + averageReach + "\n" + "- Engagement Rate: " + engagementRate + "%\n" + "- Audience Value (CPM): $" + adValue + "/1000\n\n" + "Key Metrics:\n" + "- Total Potential Reach: " + totalReach + "\n" + "- Total Engagements: " + totalEngagements + "\n" + "- EMV per Engagement: " + emvPerEngagement + "\n\n" + "Estimated Earned Media Value (EMV): " + emvResult + "\n\n" + "Formula: EMV = (Total Potential Reach * CPM Value) / 1000"; // Use navigator.clipboard for modern browsers if (navigator.clipboard && window.isSecureContext) { navigator.clipboard.writeText(copyText).then(function() { alert('Results copied to clipboard!'); }).catch(function(err) { console.error('Failed to copy: ', err); fallbackCopyTextToClipboard(copyText); }); } else { fallbackCopyTextToClipboard(copyText); } } function fallbackCopyTextToClipboard(text) { var textArea = document.createElement("textarea"); textArea.value = text; textArea.style.position = "fixed"; // Avoid scrolling to bottom textArea.style.left = "-9999px"; textArea.style.top = "-9999px"; document.body.appendChild(textArea); textArea.focus(); textArea.select(); try { var successful = document.execCommand('copy'); var msg = successful ? 'successful' : 'unsuccessful'; alert('Results copied to clipboard! (' + msg + ')'); } catch (err) { console.error('Fallback: Oops, unable to copy', err); alert('Failed to copy results. Please copy them manually.'); } document.body.removeChild(textArea); } // Function to toggle FAQ answers function toggleFaq(element) { var parent = element.parentNode; if (parent.classList.contains('open')) { parent.classList.remove('open'); } else { parent.classList.add('open'); } } // Initial calculation on page load window.onload = function() { // Ensure the canvas element exists before trying to get context var canvas = getElement('emvChart'); if (canvas) { // Initialize chart with default values (zeros) updateChart(0, 0, 0); } calculateEMV(); // Calculate with default input values }; // Chart.js library inclusion (replace with actual script tag if using CDN) // For a self-contained file, you'd typically include the library directly. // Since we are restricted to ONLY HTML, we'll assume Chart.js is available // or the user will include it. For a truly self-contained solution without // external libraries, SVG or native Canvas API would be needed, which is complex. // Let's simulate it for now assuming Chart.js is available. // To make this fully runnable, you'd need: // // Add this script tag AFTER the closing tag or BEFORE the closing tag if possible. // However, the prompt strictly forbids external libraries *in the output*. // So, we'll use pure JS for canvas drawing if possible or state limitation. // Re-evaluating: The prompt states "No external chart libraries". // This implies I *must* use native canvas or SVG. // Native Canvas API drawing is quite verbose. Let's attempt a simple bar chart with it. // Removing Chart.js dependency and implementing basic Canvas drawing. function drawCanvasChart(canvasId, dataLabels, dataValues, dataColors, title) { var canvas = getElement(canvasId); if (!canvas || !canvas.getContext) { console.error("Canvas not supported or element not found."); return; } var ctx = canvas.getContext('2d'); ctx.clearRect(0, 0, canvas.width, canvas.height); // Clear previous drawing var chartWidth = canvas.width; var chartHeight = canvas.height; var barWidth = (chartWidth * 0.8) / dataLabels.length * 0.6; // 80% for bars, 60% width of available slots var padding = chartWidth * 0.1; // 10% padding on each side var barSpacing = (chartWidth * 0.2) / (dataLabels.length > 1 ? dataLabels.length – 1 : 1); // Space between bars // Find max value for scaling var maxValue = 0; for (var i = 0; i maxValue) { maxValue = dataValues[i]; } } if (maxValue === 0) maxValue = 1; // Prevent division by zero var scaleY = (chartHeight * 0.8) / maxValue; // Scale factor for y-axis // Draw Title ctx.fillStyle = '#004a99'; ctx.font = 'bold 16px Segoe UI, Tahoma, Geneva, Verdana, sans-serif'; ctx.textAlign = 'center'; ctx.fillText(title, chartWidth / 2, 30); // Draw Bars and Labels ctx.font = '12px Segoe UI, Tahoma, Geneva, Verdana, sans-serif'; ctx.textAlign = 'center'; var startX = padding + barWidth / 2; for (var i = 0; i < dataLabels.length; i++) { var barHeight = dataValues[i] * scaleY; var x = startX + i * (barWidth + barSpacing); var y = chartHeight – 40 – barHeight; // 40px for bottom label/axis space // Draw bar ctx.fillStyle = dataColors[i] || 'rgba(0, 123, 255, 0.6)'; ctx.fillRect(x – barWidth / 2, y, barWidth, barHeight); // Draw value label above bar ctx.fillStyle = '#333'; ctx.font = '11px Segoe UI, Tahoma, Geneva, Verdana, sans-serif'; ctx.fillText(formatNumber(dataValues[i]), x, y – 5); // Draw category label below bar ctx.fillStyle = '#555'; ctx.font = '11px Segoe UI, Tahoma, Geneva, Verdana, sans-serif'; ctx.fillText(dataLabels[i], x, chartHeight – 15); } // Draw Y-axis line (optional simple line) ctx.strokeStyle = '#ccc'; ctx.lineWidth = 1; ctx.beginPath(); ctx.moveTo(padding, chartHeight – 40); ctx.lineTo(padding, 10); // Top edge of chart area ctx.stroke(); // Draw Y-axis ticks and labels (simplified) var tickCount = 5; for(var j=0; j <= tickCount; j++){ var value = Math.round(maxValue * (j / tickCount)); var yPos = chartHeight – 40 – (value * scaleY); ctx.fillStyle = '#888'; ctx.font = '10px Segoe UI, Tahoma, Geneva, Verdana, sans-serif'; ctx.textAlign = 'right'; ctx.fillText(formatNumber(value), padding – 5, yPos + 4); // Align text baseline slightly ctx.strokeStyle = '#ddd'; ctx.lineWidth = 1; ctx.beginPath(); ctx.moveTo(padding – 5, yPos); ctx.lineTo(padding, yPos); ctx.stroke(); } } // Override updateChart to use the native canvas drawing function function updateChart(totalReach, totalEngagements, emv) { var canvasId = 'emvChart'; var labels = ['Total Potential Reach', 'Total Engagements', 'Estimated EMV']; var values = [totalReach, totalEngagements, emv]; var colors = [ 'rgba(0, 74, 153, 0.7)', // Primary blue for Reach 'rgba(40, 167, 69, 0.7)', // Success green for Engagements 'rgba(255, 193, 7, 0.7)' // Warning yellow for EMV ]; var title = 'EMV Components Breakdown'; // Set canvas dimensions dynamically if needed, or use CSS. // For simplicity, let's assume fixed dimensions in HTML/CSS and rely on aspect ratio. // Ensure canvas has a style or width/height attribute set. // Example: drawCanvasChart(canvasId, labels, values, colors, title); } // Adjust canvas height based on container dynamically (optional, can be done via CSS) // Example: document.getElementById('emvChart').style.height = '300px'; <!– –> // Ensure canvas has dimensions set for the JS drawing to work correctly // This should ideally be in the HTML, but we can set it here too if needed. var canvas = getElement('emvChart'); if (canvas) { canvas.width = 600; // Set explicit width canvas.height = 300; // Set explicit height }

Leave a Comment