Churn Rate Calculator

How to use the churn rate calculator

1. Period you are measuring: pick a month, a quarter or a year. Monthly is the usual choice for a subscription product with monthly plans.
2. Customers at the start of the period: count the paying customers you had on day one. Do not add anyone who signed up later.
3. Customers lost during the period: of those starting customers, count the ones who cancelled or did not renew.
4. Recurring revenue at the start and recurring revenue lost (optional): enter your monthly recurring revenue on day one and the amount you lost to cancellations and downgrades. This gives you revenue churn as well as customer churn.

The result updates as you type. It shows your churn rate for the period, your retention rate, what that churn adds up to over a full year and how long an average customer stays.

The churn rate formula

There is more than one way to define churn rate. This calculator uses the most common one: customers lost divided by customers at the start of the period. New customers who join during the period are not counted in either number, so sign-ups cannot hide the customers you lost.

The yearly figure compounds, because each month you lose a share of the customers who are still left, not a share of the original group. The lifetime figure assumes churn stays constant.

A worked example

Say you run a small subscription app. You start the month with 500 paying customers and $25,000 in monthly recurring revenue. During the month, 25 of those customers cancel, and cancellations and downgrades together cost you $1,000 of recurring revenue.

Revenue churn here is lower than customer churn. That tells you the customers who left were paying less than average. Now change one input: if you lose 15 customers instead of 25, monthly churn drops to 3%, yearly churn to 30.6% and average lifetime rises to 33.3 months. A two-point drop in churn adds more than a year to how long a customer stays.

How to read your churn rate

Churn tells you whether people keep finding your product worth paying for. It is one of the clearest signs of product-market fit: if customers stay, you have built something they need.

• Compare like with like. Monthly churn on monthly plans and yearly churn on annual plans are different numbers. Do not mix them.
• Watch the trend, not one month. With a small customer base, two cancellations can swing the rate. Look at three or more months together.
• Link it to lifetime value. Lower churn means a longer customer lifetime, which raises customer lifetime value. Put your churn rate into the LTV calculator to see the effect.
• Check it against what you pay to win a customer. If customers leave before they have paid back your customer acquisition cost, growth costs you money.

How to lower churn

• Ask the people who left. A short call or a one-question cancellation form tells you more than any dashboard. The same customer interview skills you use to test an idea work here.
• Sell to the right customer. Churn often starts at the sale. If you sign up people who do not really have the problem you solve, they leave when they notice the product is not for them.
• Get new customers to a first result quickly. People who see the product work in their first days are more likely to stay.
• Fix failed payments. Some churn is not a decision at all, only an expired card. Retry the payment and email the customer.
• Offer an annual plan. Customers on yearly billing decide once a year instead of twelve times.

If you are still at the idea stage, you can lower future churn before you build anything by checking that the problem is real and frequent. See how to validate a startup idea. In Fonda, you talk to real customers in the Validate phase before you get a Verdict, and the Scale phase has a Key metrics step.

What the calculator leaves out

• New customers. Anyone who joined during the period is ignored, including people who joined and left inside it.
• Net revenue churn. The revenue figure is gross churn. It does not subtract upgrade revenue from existing customers, so it can never be negative. Use the MRR calculator to see upgrades and downgrades together.
• Cohorts. Customers who joined last month usually churn faster than customers who have stayed for a year. One blended rate hides that.
• Changing churn. The yearly and lifetime figures assume this period's rate repeats every period. For a young product it rarely does.
• Reasons. The calculator counts who left, not why. Only your customers can tell you that.