.growth-calculator-wrapper {
max-width: 800px;
margin: 0 auto;
font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
.calculator-box {
background: #f9f9f9;
padding: 25px;
border-radius: 8px;
box-shadow: 0 2px 10px rgba(0,0,0,0.05);
margin-bottom: 30px;
border: 1px solid #eee;
}
.calc-row {
margin-bottom: 15px;
}
.calc-row label {
display: block;
margin-bottom: 5px;
font-weight: 600;
color: #333;
}
.calc-row input {
width: 100%;
padding: 10px;
border: 1px solid #ccc;
border-radius: 4px;
box-sizing: border-box; /* Ensure padding doesn't affect width */
}
.calc-btn {
width: 100%;
padding: 12px;
background-color: #0073aa;
color: white;
border: none;
border-radius: 4px;
font-size: 16px;
font-weight: bold;
cursor: pointer;
transition: background-color 0.3s ease;
}
.calc-btn:hover {
background-color: #005177;
}
#growthResult {
margin-top: 20px;
padding: 15px;
background: #fff;
border: 1px solid #e0e0e0;
border-radius: 4px;
display: none; /* Hidden by default */
}
.result-metric {
margin-bottom: 10px;
font-size: 15px;
color: #555;
display: flex;
justify-content: space-between;
border-bottom: 1px solid #eee;
padding-bottom: 5px;
}
.result-metric span.value {
font-weight: bold;
color: #2c3e50;
}
.result-metric.highlight {
font-size: 18px;
color: #0073aa;
border-bottom: none;
padding-top: 10px;
}
.calculator-content h2 {
margin-top: 30px;
color: #2c3e50;
}
.calculator-content p {
line-height: 1.6;
color: #444;
}
.calculator-content ul {
margin-top: 10px;
padding-left: 20px;
line-height: 1.6;
color: #444;
}
function calculateMonthlyGrowth() {
// 1. Get input values
var startVal = parseFloat(document.getElementById('startValue').value);
var endVal = parseFloat(document.getElementById('endValue').value);
var months = parseFloat(document.getElementById('periodMonths').value);
var resultContainer = document.getElementById('growthResult');
// 2. Validation: Check for NaN, zero starting value, or zero/negative months
if (isNaN(startVal) || isNaN(endVal) || isNaN(months)) {
resultContainer.style.display = 'block';
resultContainer.innerHTML = 'Please fill in all fields with numeric values.';
return;
}
if (startVal <= 0) {
resultContainer.style.display = 'block';
resultContainer.innerHTML = 'Starting Value must be greater than zero to calculate percentage growth.';
return;
}
if (months 0) ? "+" : "";
return sign + num.toFixed(2) + "%";
}
// 5. Display Results
resultContainer.style.display = 'block';
resultContainer.innerHTML =
'
' +
'*CMGR is the most accurate metric for measuring consistent month-over-month compounding growth.';
}
Understanding Monthly Growth Rates
Monitoring your growth rate is crucial for assessing the health and trajectory of a business, website, or investment. This Monthly Growth Rate Calculator helps you determine how much a specific metric—such as revenue, user base, or traffic—has grown over a defined period of months.
While looking at total growth is useful, understanding the average monthly velocity gives you a better indicator of trends and future performance.
Compounded vs. Simple Monthly Growth
This tool provides two different perspectives on monthly growth, though the Compounded Monthly Growth Rate (CMGR) is generally preferred for most business metrics.
- Total Percentage Growth: This is the overall percentage change from your starting point to your ending point, ignoring the time it took to get there.
- Simple Average Monthly Growth: This takes the total percentage growth and divides it evenly by the number of months. It assumes growth was linear (adding the same amount each month), which is rarely true in business.
- Compounded Monthly Growth Rate (CMGR): This is the most accurate measure for things that compound (like a user base growing virally or reinvested revenue). It calculates the consistent month-over-month percentage increase required to get from the starting value to the ending value over the specified time frame.
Example Calculation
Suppose a startup had 1,000 active users at the beginning of January (Starting Value). By the end of June, 6 months later, they grew to 2,500 active users (Ending Value). The time period is 6 months.
Using the calculator above, the results would show:
- Total Growth: +1,500 users
- Total Percentage Growth: +150.00%
- Compounded Monthly Growth Rate (CMGR): +16.50%
Even though the total growth was 150%, the CMGR shows that the company grew its user base by an average of 16.5% every single month compounded to reach that goal.