MRR & ARR Growth Calculator
Month-over-month growth, compound monthly growth rate, ARR, net new MRR and doubling time from a series of MRR figures or their new, expansion and churn parts.
How fast recurring revenue is really growing once the month-to-month noise is compounded away, what the run-rate is, and where a straight extrapolation would land.
Example: MRR of 10,000, 10,800, 11,500 and 12,650 grows 8.15 % a month compounded (26.5 % over the four months), an ARR of 151,800, doubling in 8.8 months if the rate held.
Compound the rate.
Then distrust the projection.
Month-over-month versus compound growth, what ARR means, and why the projection is labelled an extrapolation.
MRR, its parts, and ARR
Monthly recurring revenue is the subscription revenue normalised to one month. Enter the total for each month, or let the page build it from movements — new MRR from new customers, expansion and contraction from existing ones, and MRR churned with lost customers — so that each month is the previous total plus net new MRR. ARR is simply twelve times the latest MRR: the annual run-rate if nothing changed, not a forecast.
Growth rates
Month-over-month growth is each month over the previous one, and jumps around. The compound monthly growth rate (CMGR) is the single constant rate that would take the first month to the last, (last ÷ first)^(1/(n−1)) − 1; it is the number to quote because it is unaffected by the noise in between. The doubling time follows from it as ln 2 ÷ ln(1 + CMGR). The plain average of the monthly rates is shown too, and differs from the CMGR when growth is uneven.
The projection
The projection multiplies the latest MRR by (1 + CMGR) for each month ahead — a straight line on a log scale. It carries no seasonality, no change in churn, no sales capacity limit and no market size, and high early rates never hold, which is why very high rates are flagged. Use it to see what the current pace implies, not as a plan. Nothing leaves the browser; the same four anonymous usage counts as the rest of the site apply.
SOURCES
- MRR, ARR, net new MRR and compound monthly growth rate as commonly defined in SaaS metrics guides (e.g. David Skok’s "SaaS Metrics 2.0") — definitions only; no benchmark adopted
Last reviewed 19 September 2026. How results are checked: How we verify.