SaaS Churn Calculator

Customer churn — logo churn — is the share of customers you lose in a period. Because new signups inflate the end count, the correct formula removes them before comparing.

Inputs

Customers at period start

Customers at period end

New customers during period

Results

Churn rate

6.0%

Customers lost: 24
Retention rate: 94.0%
Annualized churn (compounded): 51.0%

For monthly churn under ~3%, annualized churn is roughly 12× the monthly rate; above that, compounding matters and this calculator uses the exact formula.

Formula

Churn = (Start + New − End) ÷ Start

FAQ

What's a good monthly churn rate?

For B2B SaaS, roughly 1–2% monthly is common and healthy; B2C and SMB-focused products often run higher. Compare within your segment.

Why not just (start − end) ÷ start?

That understates churn whenever you add customers, because new signups mask losses. Removing new customers isolates actual losses.