Quick answer
Churn Rate Calculator: what it calculates
Churn Rate Calculator calculates churn rate from starting customers, lost customers and starting mrr. The core method is Customer churn = lost customers / starting customers x 100.
Business Calculators
Churn Rate Calculator
Use this churn rate calculator to compare customer churn, revenue churn, retained customers, and retained MRR over the same period.
Reviewed May 25, 2026EstimateFormula shown
ResultChurn rate
InputsStarting customers, Lost customers, Starting MRR, Churned MRR
FormulaChurn rate formula
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.
Formula
Churn rate formula
Customer churn = lost customers / starting customers x 100Revenue churn uses churned MRR divided by starting MRR for the same period.
How to use
Steps
- Enter the starting customer count for the period.
- Enter customers lost during that same period.
- Enter starting MRR and churned MRR.
- Compare customer churn and revenue churn.
Example
Sample calculation
Starting customers820
Lost customers38
Customer churn4.63%
Calculator use
Best for
- Use this churn rate calculator to compare customer churn, revenue churn, retained customers, and retained MRR over the same period.
- Checking churn rate formula with the formula and assumptions visible.
- Comparing the result with the sample calculation and benchmark table before using it elsewhere.
- Pricing, runway, cash flow, or work assumptions before an operating decision.
Before relying on it
Check first
- Using the churn rate without confirming that starting customers, lost customers and starting mrr describe the same real-world case.
- Ignoring that revenue churn uses churned MRR divided by starting MRR for the same period.
- Relying on the number without checking whether the visible assumptions match the real-world task.
- Mixing cash and accounting profit, or monthly recurring items and one-time items.
Benchmarks
How to read the result
The calculator is a decision aid, not a fixed rule. Use the output to compare scenarios and document your assumptions. Benchmark ranges are broad planning heuristics unless this page names a specific source for the range.
Low churnUnder 2%
A broad heuristic that may indicate strong retention for many subscription models.
Watch churn2% - 5%
Often worth segmenting by plan, cohort, acquisition source, and tenure.
High churn5%+
Can make growth expensive unless acquisition, pricing, or retention improves.
Calculator accuracy
Methodology and assumptions
The formula, inputs, example, and limitations are shown so the result is checkable, not just a number in a box.
Formula
Customer churn = lost customers / starting customers x 100
Inputs used
Starting customers, Lost customers, Starting MRR, Churned MRR
Limitations
Results are estimates for quick planning and should be checked before important financial, legal, tax, health, or business decisions.
Last reviewed
May 25, 2026
Cite this page
Toolkit Shelf. Churn Rate Calculator. Retrieved May 25, 2026, from 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.
Can this replace accounting or legal advice?
No. Business calculators are scenario tools. Contracts, taxes, payment timing, accounting treatment, refunds, and legal requirements can change decisions.
What should I do after using a business calculator?
Save the assumptions, compare a conservative scenario, and review the result with actual books, contracts, or an advisor before making a high-stakes decision.
Why might another calculator show a different result?
Different calculators may use different rounding, assumptions, default rates, formulas, or input timing. Compare the visible formula and inputs before relying on the number.