Calculators
SaaS MRR Calculator
Calculate ending MRR, net new MRR, ARR and net and gross revenue retention from monthly MRR movements.
- Runs in your browser
- Nothing uploaded
The tool
Enter your numbers below. Results update as you type, and nothing leaves your browser.
Everything you enter stays on your own machine. Nothing is sent to us or to anyone else, which you can confirm in your browser network tab.
What people use it for
- Building a monthly SaaS metrics report
- Explaining MRR movement to a board
- Checking retention before fundraising
- Comparing months on a like-for-like basis
About this tool
What the SaaS MRR Calculator does
Monthly recurring revenue (MRR) changes through new customers, expansion, contraction and churn. This calculator builds the MRR bridge for a month and derives annual run rate plus net and gross revenue retention, the metrics investors read first.
Formula
- Net new MRR = new + expansion − contraction − churned
- Ending MRR = starting MRR + net new MRR
- NRR = (starting + expansion − contraction − churned) ÷ starting
- GRR = (starting − contraction − churned) ÷ starting
Worked example
Using the starting values in the calculator above:
| Input | Value |
|---|---|
| Starting MRR | $50,000 |
| New MRR | $6,000 |
| Expansion MRR | $2,000 |
| Contraction MRR | $800 |
| Churned MRR | $1,500 |
| Result | Value |
|---|---|
| Ending MRR | $55,700 |
| Net new MRR | $5,700 |
| ARR run rate | $668,400 |
| MRR growth this month | 11.4% |
| Net revenue retention (month) | 99.4% |
| Gross revenue retention (month) | 95.4% |
How to read the result
Net revenue retention above 100% means existing customers grow faster than they leave, so the business grows even with no new sales. That is the single strongest signal of product value in SaaS.
These retention figures are monthly. Annual NRR is usually quoted on a twelve-month cohort, which is not the same as multiplying the monthly figure by twelve.
Related calculators
- ARR Growth Calculator: Project annual recurring revenue at a growth rate and find the growth needed to hit an ARR target on time.
- SaaS Pricing Model Calculator: Compare monthly revenue from flat-rate, per-seat and usage-based pricing for the same customer base.
- Subscription Revenue Forecast Calculator: Forecast subscribers, MRR and cumulative revenue month by month from new sign-ups, churn and price.
- Churn Rate Calculator: Calculate customer churn, annualised churn, average customer lifetime and revenue churn for a period.
Browse every calculator in SaaS and Technology Calculators, or talk to us about web and SaaS development.
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Questions
Questions about this tool
The things clients actually want to know — costs, timelines, ownership and what happens after launch.
Add up the monthly subscription value of every active customer, converting annual plans to a monthly amount and excluding one-off fees.
The revenue kept from existing customers after expansion, contraction and churn, as a percentage of what they paid at the start.
ARR is the annualised version of MRR, normally MRR multiplied by 12.
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