SaaS metrics calculator: MRR, ARR, NRR, churn, and quick ratio
Calculate the SaaS metrics investors actually care about: ending MRR, ARR, net revenue retention (NRR), gross churn rate, and quick ratio. Free, no signup, shareable result.
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How to read this calculation
Ending MRR = Starting MRR + New MRR + Expansion MRR − Churned MRR − Contraction MRR
ARR = Ending MRR × 12
NRR = ((Starting MRR + Expansion − Churn − Contraction) ÷ Starting MRR) × 100
Gross Churn = ((Churned MRR + Contraction MRR) ÷ Starting MRR) × 100
Quick Ratio = (New MRR + Expansion MRR) ÷ (Churned MRR + Contraction MRR)
NRR (Net Revenue Retention) is the single most important SaaS metric. It measures what happens to your existing customer base over a period — does it grow through expansion, or shrink through churn? NRR above 100% means existing customers generate more revenue this year than last year, even before adding new customers. NRR is the closest thing to a single number that predicts SaaS valuation multiples.
Quick ratio measures growth efficiency. It's the ratio of new + expansion MRR to churned + contraction MRR. Above 4 indicates strong, efficient growth; 2-4 is healthy; below 1 means you're losing more than you're gaining. Quick ratio above 4 with positive NRR is the signature of a top-quartile SaaS business.
The fastest NRR lift comes from expansion, not retention. A SaaS business at 95% NRR can reach 115% by adding 20 points of expansion revenue — typically through upsells, seat expansion, or feature add-ons to existing customers. Reaching 115% by reducing churn alone requires cutting churn from 5% to nearly 0% monthly, which is operationally extremely difficult.
Frequently asked questions
The questions SaaS operators most commonly ask about MRR, ARR, NRR, and churn.
What's the difference between gross churn and net revenue retention (NRR)?
Gross churn measures only revenue lost from the existing base — churned customers + contraction. NRR measures the net change to the existing base, including expansion revenue from upsells and seat additions. A business with 10% gross churn and 25% expansion has 115% NRR. Both metrics matter: gross churn tells you about retention, NRR tells you about whether existing customers are a net growth driver.
What's a good NRR for a SaaS business?
Above 100% is healthy. 100-110% is standard mid-market. 110-120% is excellent and investor-grade. 120%+ is best-in-class — Snowflake, Datadog, and other top SaaS run here. SMB-focused SaaS often runs 90-100% NRR due to structurally higher churn; above 95% is the realistic SMB target. NRR is the single best predictor of SaaS valuation multiples.
What is quick ratio and why does it matter?
Quick ratio = (New MRR + Expansion MRR) ÷ (Churned MRR + Contraction MRR). It measures growth efficiency. Above 4 indicates strong, efficient growth; 2-4 is healthy; below 1 means you are losing more than gaining. Quick ratio captures the trade-off between acquisition pace and retention quality in a single number. Businesses with high quick ratio + positive NRR are top-quartile SaaS.
How do I convert annual contracts to MRR?
Divide annual contract value (ACV) by 12. A $24,000 annual contract is $2,000 MRR. For multi-year contracts, normalize to the annual value first: a $60,000 three-year contract is $20,000 ACV and $1,667 MRR. Don't double-count by including upfront payment in MRR — MRR represents recurring monthly revenue, not cash received. This is one of the most common SaaS metric errors.
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