SaaS Churn Cost Calculator

How to use this calculator

1. Enter your MRR — the monthly recurring revenue of the SaaS you're evaluating (or your own).
2. Enter the monthly churn rate — if evaluating a target, use the REAL rate you compute from the raw CSV, not the seller's reported rate. See how the Churn Divergence Detector separates logo churn from revenue churn.
3. Enter CAC (optional) — customer acquisition cost. The calculator uses it to estimate the cost of replacing churned customers on top of the revenue loss.
4. Click Calculate — see the annual dollar impact and how your rate compares to SaaS benchmarks.

Why churn cost matters in SaaS acquisitions

Buyers often price a SaaS at a multiple of revenue without stress-testing the churn number behind that revenue. A business reporting 2% monthly churn may actually be losing 5%+ when computed from raw data — the 7 tricks sellers use to hide churn. The gap between reported and real churn rate can be 4× or more, and the annual dollar impact of that gap is directly negotiation-relevant.

For a deeper buyer-side analysis, the full ChurnLens product scores revenue concentration, annual-plan decay, zombie MRR, and revenue quality from raw subscription CSVs.

Benchmarks: what's a "good" churn rate?

The median SaaS monthly gross churn rate is approximately 2.4% (Recurly 2025, SaaS Capital). Best-in-class is under 1% monthly. The bottom quartile exceeds 5%. But the number that actually matters in a SaaS acquisition is annual revenue churn — which is typically higher than logo churn and is the gap the Churn Divergence Detector surfaces. See full benchmarks at SaaS Churn Rate Benchmarks 2026.