Calculate your MRR, ARR, growth rate, and SaaS retention metrics (NRR, GRR, quick ratio) in seconds. Free, private, no sign-up.
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Monthly recurring revenue is the clearest measure of a subscription business, and the easiest to overstate. The Parix.ai MRR calculator keeps the definition honest by separating what recurs from what merely arrived.
Only predictable, recurring, contracted revenue.
Include: monthly subscription fees, annual contracts divided by twelve, and recurring add-ons and seat expansions.
Exclude: one-off setup or onboarding fees, professional services and consulting, usage overages that vary month to month, and anything not under contract.
Counting setup fees as MRR is the most common inflation, and it makes growth look better in exactly the months you should be worried.
The total is less useful than the movement behind it.
| Component | What it is |
|---|---|
| New MRR | From customers acquired this month |
| Expansion MRR | Upgrades and seat additions from existing customers |
| Reactivation MRR | Returning churned customers |
| Contraction MRR | Downgrades, negative |
| Churned MRR | Cancellations, negative |
Flat MRR can hide heavy churn offset by heavy acquisition. That is an expensive way to stand still, and the total alone never shows it. The Churn Rate Calculator separates the two.
The metric investors ask about first. NRR = (starting MRR + expansion − contraction − churn) ÷ starting MRR, counting only existing customers.
Above 100% means your existing base grows without any new customers. That is the strongest signal a subscription business can produce, and it is why expansion revenue matters more than most teams treat it.
For a business with stable monthly subscriptions, it is. For one with seasonal usage or heavy annual prepayment, multiplying a single month by twelve projects that month’s conditions across a year — which is fine in a steady business and misleading in a lumpy one.
SaaS founders reporting to a board. Finance teams tightening a definition that has drifted. Anyone preparing numbers an investor will take apart. Pair it with the Rule of 40 Calculator and the LTV Calculator, and our SaaS product team if the model needs building as well as measuring.
Enter your recurring revenue above. Leave the setup fees out and the number will survive contact with an investor.
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