Churn Rate Calculator

Churn Rate Calculator: calculate churn rate for your business. Formula, benchmarks, and practical tips included.

The Churn Rate & Revenue Impact Calculator computes monthly and annual churn percentage, MRR lost to churned customers, net new MRR, customer lifetime (months), and customer LTV from four inputs. A 12-month MRR chart compares your current churn trajectory against a scenario where you reduce churn by 50%, making the revenue upside of retention improvements concrete. Use Profit Margin Calculator for a full SaaS metrics dashboard, or Markup Calculator to model how LTV improvement affects your unit economics.

Pacific Crest's annual SaaS survey found top-quartile SaaS companies have annual churn below 2%, while the median is approximately 8%. Monthly churn above 5% typically signals a product-market fit issue or serious retention problem — at 5% monthly churn, 46% of the customer base churns annually. Research by Price Intelligently found that a 1% reduction in monthly churn increases customer LTV by approximately 14% due to the compound effect on average customer lifetime. Customer success investment typically reduces churn by 2–5 percentage points — a high-ROI lever compared to acquiring new customers.

Enter Customers at start of month — your active customer count at the beginning of the period.
Enter Customers lost (churned) — the number of cancellations during the same period.
Set ARPU (average revenue per user per month) — your average MRR per customer.
Enter New customers acquired during the same period — this feeds the net new MRR calculation.
Read the churn rate indicator (green/amber/red), LTV, MRR lost, and the 12-month projection chart.

Churn rate and LTV formulas

Monthly churn % = (Customers lost ÷ Starting customers) × 100. Annual churn % = (1 − (1 − Monthly churn ÷ 100)^12) × 100 — not simply 12× monthly, because it compounds.

Customer lifetime (months) = 1 ÷ (Monthly churn ÷ 100). LTV = ARPU × Customer lifetime. MRR lost = Churned customers × ARPU. Net new MRR = (New customers − Churned) × ARPU.

Worked example: 500 customers, 25 churned, £49 ARPU, 40 new customers. Monthly churn = 25 ÷ 500 × 100 = 5%. Annual churn = (1 − 0.95^12) × 100 = 46%. MRR lost = 25 × £49 = £1,225. Net new MRR = (40 − 25) × £49 = £735. Customer lifetime = 1 ÷ 0.05 = 20 months. LTV = £49 × 20 = £980.

Reading your churn metrics

Monthly churn, LTV, and MRR impact

The churn traffic light: green (under 2%/month) is healthy for a mature SaaS; amber (2–5%) requires investigation and active retention work; red (over 5%) signals a fundamental problem requiring urgent product and customer success intervention. Note that the annual churn is not monthly × 12 — at 5% monthly churn, annual churn compounds to 46%, not 60%.

LTV is most useful when compared against CAC (Customer Acquisition Cost). Industry wisdom holds that a healthy SaaS business has LTV:CAC > 3:1 and recovers its CAC in under 12 months. If your LTV from this calculator is £980 but your CAC is £500, your LTV:CAC is 1.96:1 — below the target, meaning you're likely spending too much to acquire customers relative to their lifetime value.

Business tips and best practices

Segment churn by cohort, plan type, and acquisition channel — aggregate churn masks where your real problem is. A monthly plan customer may churn 3× faster than an annual subscriber.
Implement a "save" campaign: proactively contact customers who have been inactive for 30+ days before they cancel — saves cost 10–15× less than acquiring a new customer.
Voluntary vs involuntary churn: up to 30% of SaaS churn is involuntary (failed payments) — implement dunning management (retry logic, email reminders) to recover these.
Annual vs monthly plans: annual subscribers churn at approximately 1/5th the rate of monthly subscribers. Offer a discount (2 months free) to migrate customers to annual billing.
Product-led retention: measure feature adoption by cohort — customers who use 3+ core features churn at dramatically lower rates than those who use only 1.
Net Revenue Retention (NRR): if expansion MRR from upsells exceeds churn MRR, your NRR is above 100% — meaning your existing customer base grows even without new customers. This is the gold standard of SaaS health.

Top quartile SaaS annual churn: below 2%. Median: approximately 8%. [Pacific Crest / KeyBanc SaaS Survey]
Monthly churn above 5% implies 46% annual customer churn — at this rate, the company must replace nearly half its customer base every year to stay flat.
1% monthly churn reduction → approximately 14% increase in customer LTV, due to compound effect on average lifetime. [Price Intelligently / ProfitWell]
Involuntary churn accounts for 20–40% of total SaaS churn — recoverable through dunning management and payment retry logic. [Baremetrics data]

Common mistakes to avoid

Multiplying monthly churn by 12 for annual churn — this overestimates: 5% monthly is 46% annual, not 60%.
Measuring only gross churn without net revenue retention — a company with 5% customer churn but 10% expansion from upsells has positive net dollar retention and is growing healthily.
Using the same churn rate across all segments — enterprise customers typically churn at 1–2% annually; SMB customers at 10–20%. Averaging these masks the true risk profile.
Treating churned customers as lost forever — win-back campaigns targeting former customers typically convert at 20–40% — 2–3× the rate of a cold acquisition.

This calculator provides general information only and does not constitute financial, investment, or legal advice. SaaS metrics definitions and benchmarks vary by data source and business model. Always validate metrics with your own financial statements and consult a qualified accountant for financial reporting purposes.