Kossin Labs / Free tools

Free MRR growth calculator

Project your MRR month by month from new revenue, churn and expansion, and see the ceiling where churn cancels out growth. Everything runs in your browser. Nothing is saved or sent.

Your numbers

Starting MRR ($) New MRR added per month ($) Monthly revenue churn (%) Monthly expansion (% of MRR, optional) Months to project (1 to 60)

These are made-up example numbers. Replace them with yours.

MRR at the end

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ARR at the end

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Growth over the period

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MRR lost to churn

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MRR ceiling

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How it works

Each month, MRR loses the churn percentage, gains the expansion percentage, then adds your new MRR: end = start × (1 − churn + expansion) + new. The ceiling is new MRR ÷ (churn − expansion). With $1,000 of new MRR a month and 2% net churn, MRR levels off near $50,000 however long you wait. It assumes steady rates, so treat it as a quick check, not a forecast.

More detail: how to calculate MRR and how to calculate churn. For what a customer is worth, use the LTV:CAC calculator.