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

Customer Churn Rate Calculator

Calculate the percentage of customers who stopped doing business with you over a given period. Use it monthly or quarterly to track retention health and forecast revenue risk.

Customers Lost

Total Customers

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Marketing

Marketing ROI Calculator

Calculate marketing ROI as the percentage return generated by marketing spend over the cost of that spend. Use it for executive-level marketing performance reporting, channel allocation decisions, and justifying marketing budget against business outcomes.

Revenue from Marketing ($)

Marketing Investment ($)

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Key differences

	Customer Churn Rate Calculator	Marketing ROI Calculator
Category	Marketing	Marketing
Inputs required	2	2
Result	Churn Rate (%)	Marketing ROI (%)
What it does	Calculate the percentage of customers who stopped doing business with you over a given period. Use it monthly or quarterly to track retention health and forecast revenue risk.	Calculate marketing ROI as the percentage return generated by marketing spend over the cost of that spend. Use it for executive-level marketing performance reporting, channel allocation decisions, and justifying marketing budget against business outcomes.