MRR Calculator | Monthly & Annual Recurring Revenue
Calculate MRR, ARR and SaaS growth metrics instantly. Free calculator for SaaS founders and finance teams.
Last updated: March 2026
MRR & ARR Calculator
Calculate Monthly Recurring Revenue, Annual Recurring Revenue and MRR movement metrics
What is MRR (Monthly Recurring Revenue)?
Monthly Recurring Revenue (MRR) is the lifeblood metric of any subscription or SaaS business. It represents the total predictable, normalised revenue generated every month from active subscriptions. Unlike one-time sales, MRR recurs — making it the single most important indicator of a company's financial health and growth trajectory.
The formula is elegantly simple: MRR = Number of Active Subscribers × Average Revenue Per Account (ARPA). If you have 400 customers each paying £150 per month, your MRR is £60,000. If some customers are on annual plans, normalise them: a £1,800/year contract contributes £150 MRR.
MRR vs ARR: Which Should You Use?
Annual Recurring Revenue (ARR) is simply MRR multiplied by 12. Both measure the same underlying business health — the difference is the lens through which you look:
| Metric | Best Used For | Typical Users |
|---|---|---|
| MRR | Monthly growth tracking, churn monitoring, cohort analysis | Early-stage, high-growth SaaS (pre-Series B) |
| ARR | Investor reporting, annual planning, valuation multiples | Series A+, enterprise SaaS, VC reporting |
Neither MRR nor ARR is the same as GAAP revenue. A customer who pays £12,000 upfront for an annual plan contributes £1,000 MRR but the full £12,000 is received as cash today. MRR/ARR represent run-rate revenue, not cash received.
The Five Components of MRR
Understanding MRR movement requires breaking it into five components:
- New MRR — Revenue from brand-new customers acquired this month
- Expansion MRR — Revenue from existing customers upgrading to higher tiers or purchasing add-ons
- Contraction MRR — Revenue lost from existing customers downgrading to lower tiers
- Churned MRR — Revenue lost from customers who cancelled entirely
- Reactivation MRR — Revenue from previously churned customers returning
Net New MRR = New MRR + Expansion MRR + Reactivation MRR − Contraction MRR − Churned MRR. Ending MRR = Starting MRR + Net New MRR.
SaaS Quick Ratio Explained
The Quick Ratio measures growth efficiency — how many pounds of MRR you gain for every pound you lose. It was popularised by Mamoon Hamid at Kleiner Perkins as a simple VC benchmark:
| Quick Ratio | Assessment | Meaning |
|---|---|---|
| > 4 | Excellent | Strong growth, efficient churn management |
| 2 – 4 | Good | Healthy growth, watch churn trends |
| 1 – 2 | Concerning | Growth barely outpaces churn |
| < 1 | Danger | Shrinking business — churn exceeds growth |
MRR Benchmarks by Company Stage
| Stage | Typical MRR | ARR | Monthly Growth Rate |
|---|---|---|---|
| Pre-seed / Idea | £0 – £5K | < £60K | N/A |
| Seed | £5K – £50K | £60K – £600K | 10–15% MoM |
| Series A | £50K – £300K | £600K – £3.6M | 5–10% MoM |
| Series B | £300K – £1M+ | £3.6M – £12M+ | 3–5% MoM |
| Growth | £1M+ | £12M+ | 100–150%+ YoY |
MRR vs Revenue: Why SaaS Companies Use MRR
GAAP revenue recognition rules require spreading subscription revenue over the service period, which can create misleading spikes when customers pay annually upfront. MRR smooths this out, giving a cleaner view of run-rate performance. Investors and operators use MRR because it:
- Removes seasonality from annual contract timing
- Enables apples-to-apples comparison across different billing frequencies
- Ties directly to unit economics (CAC payback, LTV:CAC)
- Forms the basis for SaaS company valuation (ARR multiples, typically 5–15× ARR for high-growth companies)