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SaaS Metrics Calculator: MRR, ARR, Churn, NRR, ARPU & CAC Payback

Calculate every SaaS metric investors ask for from one month of data. Enter starting MRR, new, expansion, contraction and churned MRR, customer counts and costs to get a full metrics table with benchmarks.

QUICK ANSWERARR = MRR × 12. Net revenue retention (NRR) = (starting MRR + expansion − contraction − churn) ÷ starting MRR. Logo churn = customers lost ÷ customers at start. SaaS quick ratio = (new + expansion MRR) ÷ (contraction + churned MRR). Good SaaS companies show NRR above 100%, logo churn below 2% a month and payback under 12–18 months.

Ending MRR = Start + New + Expansion − Contraction − Churn
NRR = (Start + Expansion − Contraction − Churn) ÷ Start
Quick ratio = (New + Expansion) ÷ (Contraction + Churn)
Rule of 40 = Growth % + Profit margin %

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What the SaaS Metrics Calculator does

✅ MRR bridge and ARR
✅ NRR and GRR (monthly and annualised)
✅ Logo churn and ARPU
✅ CAC payback and quick ratio
✅ Rule of 40 and benchmarks

How to use the SaaS Metrics Calculator

STEP 1
Enter your numbers
Type the figures you know. Every field starts with a realistic example so you can see how it works.
STEP 2
Read the result instantly
Results, tables and the plain-English explanation update as you type. No submit button, no login.
STEP 3
Test scenarios
Change one assumption at a time (valuation, growth, dilution, exit) to see what really moves the outcome.
STEP 4
Share or save
Copy the summary, send it on WhatsApp or print to PDF for your co-founders, board or investment committee.

The SaaS metrics that matter most at each stage

At seed, investors focus on MRR growth and early retention signals. By Series A they want NRR, logo churn, CAC payback and burn multiple over several quarters. Later, Rule of 40 balances growth against profitability.

Annualising a single month’s NRR is noisy; use trailing 12-month cohorts when you have them.

Frequently asked questions

How do you calculate net revenue retention?

Take revenue from customers you had at the start of the period, add expansion, subtract contraction and churn, then divide by starting revenue. Exclude revenue from new customers.

What is a good churn rate for SaaS?

For SMB SaaS, under 2–3% monthly logo churn is good; for mid-market and enterprise, annual churn under 10% is common.

What is the SaaS quick ratio?

New plus expansion MRR divided by contracted plus churned MRR. Above 4 is excellent; below 1 means the business is shrinking.

Is this tool free? Do I need to sign up?

Yes. It is completely free, needs no login and has no usage limit. FastFee builds payment collection software; these startup and investor tools are free resources for founders, angels and fund managers.

Is my data private?

Yes. Everything you type stays in your own browser on this device (local storage). Nothing is uploaded to FastFee. Export or print a copy if you need to keep it.

Use it together with

CAC & LTV Calculator →CAC, LTV, LTV:CAC ratio and payback months from spend, churn and margin.Burn Multiple Calculator →Net burn ÷ net new ARR with ratings from amazing to bad and capital efficiency.Revenue Quality Score →Score revenue on recurring share, contract length, concentration, margin, retention and DSO.

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