RetainFlow · Free tools
MRR Growth & Runway Calculator
See exactly how churn is shortening your runway — month by month.
Revenue from new customers per month
Total monthly expenses
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What if 2% of your churn was recoverable revenue?
Failed payments cause 20–40% of SaaS churn. RetainFlow recovers it automatically.
Calculate Your Recovery →Guide
How to calculate SaaS runway with churn
Cash, burn, and MRR trajectory—how this projection thinks about breakeven and runway.
Runway building blocks
SaaS runway calculator style models combine cash, burn, and inflows. Here we emphasise how MRR growth and churn move the line toward breakeven.
What the simulation does
Our simulation adds net new MRR each month and subtracts churn on the prior balance—a simple mrr growth calculator view for bootstrapped planning.
Use it alongside other metrics
Pair this with unit economics and fundraising timing; bootstrapped saas metrics rarely fit one formula, but directionally slowing churn extends runway more than small burn cuts alone.