Input accuracy
Are you using real, current numbers — not rough guesses that flatter the result?
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MRR Growth Calculator
Break MRR growth into new, expansion, churned and contraction components, with a compounded 12-month projection. Free.
Benchmark fit
Is your result healthy for your specific business model, not just positive?
Sensitivity
Which single input, if wrong, would change the result most?
Time horizon
Does this hold up over 12 months, or only at today's volume?
Next decision
What should change in the business because of this number?
A headline MRR number tells you almost nothing. Flat growth can conceal heavy churn being masked by heavy acquisition, which is a far more fragile position than the total suggests.
This calculator breaks growth into its components and shows how much of your new business churn immediately consumed — usually the most revealing number on the page.
Free calculator
MRR growth calculator
Break monthly recurring revenue growth into its components, and see how much of your new business churn is quietly consuming.
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Results
Net new MRR£2.0k/mo
Ending MRR£52.0k/mo
Monthly growth rate4.0%
Churn as share of new business80.0%
Projected MRR in 12 months£80.1k/mo
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The components that matter
New MRR comes from new customers. Expansion comes from existing customers upgrading. Contraction is downgrades from customers who stayed, and churned MRR is cancellations. Net new MRR is what is left after all four.
Two businesses can show identical net growth with completely different underlying health — one winning steadily, the other running hard to replace what it keeps losing.
Churn as a share of new business
This is the diagnostic figure. If you gained £10,000 and lost £8,000, then 80% of your acquisition effort went to standing still. Acquisition can disguise that for a while, but the cost of growth rises relentlessly while it continues.
Why the projection compounds
The twelve-month projection compounds your current growth rate rather than multiplying it, because growth applies to a base that is itself growing. It assumes the current rate holds, which it rarely does — treat it as a trajectory, not a forecast.
How this calculator works
- Enter starting MRR for the month.
- Enter new, expansion, churned and contraction MRR separately.
- The calculator returns net new MRR, ending MRR, growth rate and a compounded 12-month projection.
- It also shows churn and contraction as a share of what you gained.
Direct answer — MRR Growth Calculator
Break MRR growth into new, expansion, churned and contraction components, with a compounded 12-month projection. Free.
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Frequently asked questions
What is a good monthly MRR growth rate?
Early-stage SaaS often targets 10–15% monthly, though that becomes progressively harder as the base grows. What matters more is the composition — growth driven by expansion is far more durable than growth driven purely by acquisition.
Should one-off fees be included in MRR?
No. Setup fees and professional services do not recur, and including them destroys the predictability that makes MRR useful in the first place.
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