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Churn Rate Calculator

Use this churn rate calculator to compare same period customer churn, revenue churn, retained customers, retained MRR, and retention signals before reviewing MRR, LTV/CAC, runway, and burn.

Planning estimate

Live calculator

Churn rate

Customer churn4.63%

782 customers retained.

Revenue churn6.41%

$59,900.00 MRR retained.

Use the same period

Churn only compares cleanly when the starting base, lost customers, starting MRR, and churned MRR all refer to the same month or cohort.

Planning comparison only. Check estimates, omitted costs, timing, and constraints before making an operating decision.

What it calculates

Churn Rate Calculator uses starting customers, lost customers, starting MRR, and churned MRR to estimate customer churn, revenue churn, retained customers, retained MRR, and same-period retention context.

Formula

Churn rate formula

Customer churn = lost customers / starting customers x 100

Revenue churn uses churned MRR divided by starting MRR for the same period.

How to use

Steps

  1. Enter the starting customer count for the period.
  2. Enter customers lost during that same period.
  3. Enter starting MRR and churned MRR.
  4. Compare customer churn and revenue churn.

Example

Sample calculation

Starting customers820
Lost customers38
Customer churn4.63%
Revenue churn6.41%
Retained customers782
Retained MRR$59,900

Calculator use

Best for

  • Estimating business pricing, margin, retention, runway, dilution, revenue, or profitability before an operating decision.
  • Comparing base, conservative, and optimistic assumptions with the revenue, cost, churn, or payment timing visible.

Before relying on it

Check first

  • Mixing cash flow, accounting profit, bookings, revenue recognition, one-time fees, and recurring revenue.
  • Leaving out taxes, refunds, discounts, churn, payment delays, support cost, contractor cost, or owner time.
  • Using one optimistic case as the operating plan without checking downside assumptions.

Details

What to know before using the result

Customer vs revenue churnCount and dollars can diverge

Customer churn tracks lost customers, or churned customers, as a share of the starting customer base. Revenue churn tracks churned MRR as a share of starting MRR for the same period.

Same period inputsUse one month or cohort

Churn only compares cleanly when starting customers, lost customers, starting MRR, and churned MRR all refer to the same month, billing period, or cohort.

Retention signalRetained base after churn

Retained customers and retained MRR show what remains after churn before new customers, expansion, reactivation, or contraction are added.

Next decisionConnect churn to growth math

After checking churn, review MRR, LTV/CAC, startup runway, burn multiple, and client profitability before changing acquisition, retention, or pricing plans.

Benchmarks

How to read the result

Low churn: Under 2%.

A broad heuristic that may indicate strong retention for many subscription models.

Watch churn: 2% - 5%.

Often worth segmenting by plan, cohort, acquisition source, and tenure.

High churn: 5%+.

Can make growth expensive unless acquisition, pricing, or retention improves.

Calculator accuracy

Methodology and assumptions

Formula, inputs, limitations and review record
Formula

Customer churn = lost customers / starting customers x 100

Inputs used

Starting customers, Lost customers, Starting MRR, Churned MRR

Limitations

Business results depend on contracts, accounting treatment, taxes, payment timing, refunds, collections, and operating assumptions.

Review record

Catalog QA baseline on June 6, 2026. This date marks the catalog-wide automated and editorial QA baseline, not a tool-specific expert review.

Cite this page

Toolkit Shelf. Churn Rate Calculator. https://toolkitshelf.com/tools/churn-rate-calculator

FAQ

Common questions

What is customer churn?

Customer churn is the percentage of starting customers lost during a period.

What is revenue churn?

Revenue churn is the percentage of starting recurring revenue lost to churn during the same period.

Should churn include new customers?

Churn should compare losses against the starting base. New customers belong in growth or net revenue calculations.

What is the difference between churn and retention?

Churn measures the share of customers or recurring revenue lost during a period. Retention looks at the share still active or retained after those losses.