Please enter valid non-zero numbers. Duration must be greater than 0.
Daily Growth Rate (Compounded):0.00%
Total Percentage Growth:0.00%
Absolute Total Growth:0
Avg. Daily Increase (Linear):0
function calculateGrowthRate() {
var startVal = document.getElementById('initialValue').value;
var endVal = document.getElementById('finalValue').value;
var days = document.getElementById('timePeriod').value;
var errorMsg = document.getElementById('errorMsg');
var resultBox = document.getElementById('resultBox');
// Parse inputs
var start = parseFloat(startVal);
var end = parseFloat(endVal);
var duration = parseFloat(days);
// Validation
if (isNaN(start) || isNaN(end) || isNaN(duration) || duration <= 0 || start === 0) {
errorMsg.style.display = 'block';
resultBox.style.display = 'none';
return;
}
errorMsg.style.display = 'none';
// 1. Calculate Compound Daily Growth Rate (CDGR)
// Formula: ((End / Start)^(1 / Days)) – 1
var ratio = end / start;
var exponent = 1 / duration;
var dailyRateDecimal = Math.pow(ratio, exponent) – 1;
var dailyRatePercent = dailyRateDecimal * 100;
// 2. Calculate Total Percentage Growth
var totalPercent = ((end – start) / start) * 100;
// 3. Calculate Absolute Growth
var absoluteGrowth = end – start;
// 4. Calculate Linear Average (Simple Division)
var linearAvg = absoluteGrowth / duration;
// Display Results
document.getElementById('dailyRateResult').innerHTML = dailyRatePercent.toFixed(2) + '%';
document.getElementById('totalPercentResult').innerHTML = totalPercent.toFixed(2) + '%';
document.getElementById('absoluteGrowthResult').innerHTML = absoluteGrowth.toLocaleString();
document.getElementById('linearDailyResult').innerHTML = linearAvg.toLocaleString(undefined, {minimumFractionDigits: 2, maximumFractionDigits: 2});
resultBox.style.display = 'block';
}
What is Daily Growth Rate?
The daily growth rate is a metric used to measure the speed at which a specific variable—such as revenue, user count, bacteria population, or investment value—increases over a 24-hour period. It helps analysts, marketers, and scientists understand the momentum of a trend by breaking down total growth into daily increments.
There are generally two ways to look at daily growth:
Compound Daily Growth Rate (CDGR): This assumes that growth compounds every day. This is the most accurate metric for viral loops, financial interest, or biological growth.
Linear Average Growth: This simply takes the total growth and divides it by the number of days. This is useful for fixed production schedules or simple additive tasks.
Formulas Used
1. Compound Daily Growth Rate
This formula calculates the constant percentage rate required to get from the starting value to the ending value over the specific number of days.
This measures the overall change relative to the start.
Total Growth (%) = [ (Current Value – Initial Value) / Initial Value ] × 100
Example Calculation
Imagine you launched a new mobile app. On Day 1, you had 1,000 users. By Day 30, you had 5,000 users.
To find the daily compounding growth rate:
Ratio: 5,000 / 1,000 = 5
Exponent: 1 / 30 (days) ≈ 0.0333
Calculation: 5^0.0333 ≈ 1.055
Subtract 1: 1.055 – 1 = 0.055
Percentage: 0.055 × 100 = 5.5% per day
This means your user base grew by approximately 5.5% every single day to reach 5,000 users in a month.
Why Monitor Daily Growth?
Tracking this metric is crucial for several reasons:
Early Trend Detection: A declining daily rate often precedes a plateau in total numbers.
Campaign Analysis: If you run a 7-day ad campaign, knowing the specific daily uplift helps calculate ROI.
Viral Coefficients: In social media and tech, maintaining a daily growth rate above a certain threshold (e.g., 1%) is often the target for "viral" status.
Common Use Cases
Startups: Tracking Daily Active Users (DAU) growth.
Finance: Calculating daily interest accumulation.
Biology: Measuring cell culture expansion.
Inventory: Estimating daily consumption or stockpile accumulation rates.