Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

Rule of 40 Calculator

Check whether a SaaS company's growth rate plus profit margin clears the 40% benchmark that signals a healthy balance of growth and profitability.

Revenue Growth Rate (%)

Profit Margin (%)

Ecommerce

Customer Churn Rate Calculator

Measure the percentage of customers who stopped using your service during a period. Essential for subscription businesses monitoring retention health and forecasting future revenue.

Customers Lost

Total Customers (Start)

Key differences

	Rule of 40 Calculator	Customer Churn Rate Calculator
Category	Business	Ecommerce
Inputs required	2	2
Result	Rule of 40 Score (%)	Churn Rate (%)
What it does	Check whether a SaaS company's growth rate plus profit margin clears the 40% benchmark that signals a healthy balance of growth and profitability.	Measure the percentage of customers who stopped using your service during a period. Essential for subscription businesses monitoring retention health and forecasting future revenue.