Churn rate calculator
The short answer
This churn rate calculator divides customers lost by the customers at the start of the month. The same form is a customer churn calculator for revenue: gross revenue churn is churned MRR plus contraction, divided by MRR at the start. Annual churn is 1 minus (1 minus the monthly rate) to the 12th power, not the monthly rate times 12. The fields open on EXAMPLE inputs from a fictional month, not a live business.
How to use the churn rate calculator
The fields open on EXAMPLE inputs from the sample month in how to calculate churn rate. Customers at the start are 10. Customers lost are 2. Customers at the end are 22, and new customers are 14. That pair is the same 2: 10 plus 14 minus 22. MRR at the start is $400. Churned MRR is $120. Contraction is $30. Those inputs are example data for a fictional product. Replace them.
If you type customers lost, that count is used. Clear it, and the form derives lost customers from the end count plus new customers. A blank new-customer field counts as zero only on that path. A blank contraction is zero. A blank churned MRR is not zero.
The churn rate formula on the customer line is customers lost divided by customers at the start. The same month, one row per customer, is in the Churn rate template (CSV).
Customer churn calculator vs revenue churn
How to calculate customer churn: divide the customers you lost by the customers you had at the start. The customer churn formula on the EXAMPLE inputs is 2 divided by 10, which is 20.0%.
Gross revenue churn uses dollars. The formula for churn rate on revenue is churned MRR plus contraction, divided by MRR at the start. On the EXAMPLE inputs that is $120 plus $30, divided by $400, which is 37.5%. The $30 downgrade is not a lost customer, so it stays out of the 20.0%.
To calculate customer churn, the logo line does not see the plan price. One $90 cancellation and one $30 cancellation are two logos and $120 of MRR. That is why 20.0% and 37.5% can both be right on one month. New MRR stays out of both denominators. The monthly price itself is the MRR calculator. What that starting group still pays after expansion is the NRR calculator.
Monthly to annual churn
A monthly rate repeated for a year is not that rate times 12. Each month the loss applies to whoever is still there. The annual rate is 1 minus (1 minus the monthly rate) to the 12th power.
On the EXAMPLE customer rate, 20.0% times 12 is 240.0%. That number is larger than the whole group. Compounding gives 93.1%. The same power on the 37.5% gross revenue rate gives 99.6%. ChartMogul's article from April 27, 2022, checked November 3, 2026, prints this compounding formula. It assumes the monthly rate stays the same for twelve months. A year of real rows can disagree with that.
What counts as a churned customer
A churned customer, on this form, is a paying customer from the start count who is gone by the end. Someone who joins and leaves inside the month was never in that start count. The guide leaves two such logos out of the EXAMPLE 2. ChartMogul's customer churn page, updated September 8, 2026 and checked November 3, 2026, subtracts people who joined and churned in the same period.
A trial is not a paying customer. That page says to leave free trials out. A downgrade is still a customer, so it is contraction, not a lost logo. A subscription that is only past due is still a customer until it is canceled or marked unpaid. The notes you send while the card is failing are in the dunning email sequence.
What to do with the number
Write down which count you used for customers lost, then use that same count next month. Customer churn tells you how many logos left. Gross revenue churn tells you how much MRR left, including downgrades. The annualized figure is the year you would get if this month repeated. It is not a forecast.
Read the revenue rate next to what one active user pays you. That division, on a different sample, is the ARPU calculator. This page does not print a target rate. The 20.0% and 37.5% are the EXAMPLE inputs. Lost MRR lowers the revenue that offsets costs. What that does to the months of cash left is the monthly burn and runway calculator.
The other calculators are on the tools page.
FAQ
What is a good churn rate?
This page does not give one. ChartMogul’s customer churn page, updated September 8, 2026, says there is no single average churn rate. The rate varies by company stage, category, and price point. The 20.0% and 37.5% on this form are EXAMPLE inputs from a fictional month, not a benchmark.
How do I annualize monthly churn?
Take 1 minus (1 minus the monthly rate) to the 12th power. On the EXAMPLE fields the customer rate is 20.0%, and that power is 93.1%. Multiplying 20.0% by 12 is 240.0%, which is not the annual rate. ChartMogul’s churn article prints the compounding formula. It assumes this month’s rate repeats for twelve months.
Do downgrades count as churn?
Not as a lost customer. The person is still a customer, so customer churn ignores the downgrade. Gross revenue churn includes it as contraction. ChartMogul’s revenue churn page adds churn and contraction, then divides by MRR at the start. On the EXAMPLE fields the $30 contraction is inside the 37.5% and outside the 20.0%.
Should trials count?
No. Count paying customers. ChartMogul’s customer churn page says to leave free trials out, and free plans too. The churn rate guide uses the same rule. A past-due subscription stays in until it is canceled or marked unpaid. The email while the card fails is the dunning sequence.
Customer churn vs logo churn?
Same count, two names. ChartMogul’s customer churn page says customer churn rate is also called logo churn: paying customers lost, divided by paying customers at the start. Revenue churn weights the loss by MRR instead of counting each logo as one.