Churn Rate Calculator
Monthly churn, retention rate, annual churn, and average customer lifetime
Free churn rate calculator. Enter customers at start/end of month and new customers to compute monthly churn %, retention rate, annual churn, and average customer lifetime.
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What is a Churn Rate Calculator?
Churn rate is the percentage of customers who leave your business during a given period. It is the single most important metric for subscription businesses — a 1% increase in monthly churn can reduce LTV by 20–30%, requiring proportionally higher CAC spending just to maintain the same revenue.
The formula is: Churned customers = Customers at start + New customers added − Customers at end. Churn Rate = Churned ÷ Start customers × 100. This accounts for new customers acquired during the period, preventing the common mistake of dividing churned customers by end-period count (which underestimates churn when you're growing).
Annual churn is not simply monthly churn × 12. The compounding formula is: Annual Churn = 1 − (1 − Monthly Churn)^12. At 5% monthly churn, annual churn is 46%, not 60%. This distinction matters for LTV calculations — the monthly churn-based formula (LTV = ARPU × Gross Margin / Monthly Churn) gives the correct annualised lifetime.
Why use this Churn Rate Calculator
Built for Indians, by Indians. Every number, every formula, every slab — tuned to FY 2026-27 reality.
Correct churn formula
Accounts for new customers added during the period — avoids the common under-estimation mistake.
Annual churn
Computes annual churn using the compounding formula, not the inaccurate × 12 shortcut.
Average lifetime
Average customer lifetime in months (1 ÷ monthly churn) — feeds directly into LTV calculation.
Retention visual
Donut chart shows retained vs churned customers at a glance.
Using the Churn Rate Calculator in 4 steps
No onboarding, no signup. Answer three fields and the numbers update live.
Enter customers at start of month
Total active paying customers at the first day of the month being measured.
Enter new customers added
New customers who started paying during the month. Do not include trial users or free plan users.
Enter customers at end of month
Total active paying customers at the last day of the same month.
Read the results
Monthly churn, retention rate, annual churn (compounded), and average customer lifetime update instantly.
Tips to get the most out of it
Track churn by cohort (month of acquisition), not just aggregate monthly churn. Aggregate churn can look stable while early-month cohorts churn fast — a sign of onboarding problems.
Distinguish logo churn (number of customers lost) from revenue churn (MRR lost). Large customers churning matters more than small ones. Net revenue churn = (churned MRR − expansion MRR) ÷ starting MRR.
Voluntary vs involuntary churn: involuntary churn (failed payments) accounts for 20–40% of SaaS churn. Use dunning flows (payment retry + email sequences) to recover these automatically.
The first 30 days of a customer's life are the highest-risk. A strong onboarding sequence that drives product adoption within the first week dramatically reduces 30-day churn.
NPS (Net Promoter Score) is a leading indicator of churn — detractors (0–6 NPS score) churn at 3–4× the rate of promoters. Survey monthly; act on detractor responses within 24 hours.
Real-world scenarios
How Indians actually use this calculator — concrete inputs, concrete outcomes.
B2B SaaS product
Start: 1,000. New: 80. End: 1,020. Churned: 60. Monthly churn: 6%. Annual: 51.9%. Avg lifetime: 16.7 months. Needs work — target below 3%.
D2C subscription box
Start: 500. New: 40. End: 490. Churned: 50. Monthly churn: 10%. Annual: 71.8%. Avg lifetime: 10 months. High — investigate unboxing experience and repurchase cadence.
HR software best-in-class
Start: 2,000. New: 60. End: 2,052. Churned: 8. Monthly churn: 0.4%. Annual: 4.7%. Avg lifetime: 250 months. World-class retention — scale aggressively.
Frequently Asked Questions
Still have a question? Our team replies within a business day.
Best-in-class SaaS (India or global): < 1% monthly (< 12% annual). Good: 1–3% monthly. Concerning: 3–5%. Poor: > 5% monthly. SMB-focused SaaS typically sees higher churn (5–8%) than enterprise (1–3%) due to business closures and budget sensitivity.
Yes. Negative net revenue churn occurs when expansion MRR (upgrades, add-ons, seat growth) from existing customers exceeds churned MRR. This is the hallmark of product-led growth — your existing customer base grows in revenue even as some customers leave.
First-month churn indicates an onboarding or expectation mismatch. The product did not deliver the promised value fast enough. Common fixes: in-app guided tours, activation milestones, proactive customer success outreach within 48 hours of signup.
LTV = ARPU × Gross Margin ÷ Monthly Churn. Halving churn doubles LTV. A 5% → 2.5% churn improvement doubles LTV, which means you can spend 2× on customer acquisition while maintaining the same LTV:CAC ratio.
No — only count paying customers. Free-to-paid conversion is a separate activation metric. Churn measures loss of revenue-generating customers. Mixing free and paid inflates numerator (because free churn is high) and distorts the business picture.
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