Calculators
Churn Rate Calculator: Customers Lost ÷ Start of Period
Churn Rate Calculator — 100% free, unlimited, no sign-up cost.
Churn rate = customers lost during the period ÷ customers at the start of the period × 100. Losing 24 of 600 customers in a month is 4% monthly churn.
Enter how many customers you lost and how many you had at the start of the period. The calculator returns the churn rate as a percentage for that period.
Use the Churn Rate Calculator online at no cost.Common tasks this tool helps with
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Try Churn Rate Calculator free
The Churn Rate formula
Churn Rate = (Customers Lost ÷ Customers at Start of Period) × 100
Measured over a fixed period (usually monthly). Lower is better.
Example
You started the month with 500 customers and lost 20.
(20 ÷ 500) × 100 = 4% monthly churn
Worked example: 24 of 600 customers
A subscription business starts the month with 600 customers and loses 24.
- 24 ÷ 600 × 100 = 4% monthly churn.
- Customers acquired during the month are excluded from the denominator.
- At 4% monthly, roughly 39% of a starting cohort would be gone within a year.
What to do next: Track churn by cohort and by plan to see where losses concentrate, rather than relying on one blended figure.
Why it's free
Churn compounds: a small monthly rate removes a large share of customers over a year. Use the same period and the same definition of 'lost' each time so month-to-month comparisons stay meaningful.
What you get
- A churn rate percentage for the period you entered
Who uses the Churn Rate Calculator
- SaaS and subscription operators
- Marketers measuring retention campaigns
- Founders reporting to investors
How it works
- Enter customers lost during the period
- Enter customers at the start of the same period
- Read the churn rate as a percentage
Frequently asked questions
Is the Churn Rate Calculator free?
Yes. Every one of GrowthGadgetAi's 100+ Marketing Toolkit tools, including the Churn Rate Calculator, is completely free with unlimited use — no credits, no plan requirement and no credit card.
Do I need to create an account to use it?
No. It runs on this page, in your browser, without signing in. Nothing you enter is sent to a server.
How is the Churn Rate Calculator's result calculated?
It's a direct formula, not an AI guess — the Churn Rate Calculator computes your % churn from the numbers you enter, instantly and the same way every time.
How do I use the Churn Rate Calculator?
1) Enter your Customers lost and Customers at start of period. 2) See your % churn instantly, no submit button needed. 3) Use the number in your reporting or planning. The whole process takes about a minute and runs on this page, on desktop or mobile.
What is the formula behind the Churn Rate Calculator?
Churn Rate = (Customers Lost ÷ Customers at Start of Period) × 100. Measured over a fixed period (usually monthly). Lower is better.
Does the churn rate include customers who joined during the month?
Not in this formula. It divides by customers at the start of the period, so new sign-ups are left out of both the numerator and the denominator.
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