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SaaS Metrics Calculator

Enter your revenue, acquisition or cash figures to see LTV, CAC payback, burn and runway. Use any section on its own. Nothing is uploaded.

Work out ARPA, ARR, customer lifetime, LTV, CAC, LTV:CAC, CAC payback, gross and net burn and runway in any currency (₹ INR by default), from MRR, customers, churn, gross margin, sales and marketing spend, cash and expenses.

Each result says what it means, with the common rule of thumb where there is one, and no verdict. LTV is the simple constant-churn formula, with no expansion revenue or cohorts, and runway is an estimate.

Revenue

Acquisition

Cash

Use a dot for decimals (120000.50); commas and spaces are read as thousands separators. Percentages are typed as percentages: 3 means 3%.

How to use the SaaS Metrics Calculator

  1. Pick your currency, then fill in whichever sections you need. Each one works on its own.
  2. Revenue: enter MRR and paying customers, or type ARPA directly, then monthly churn. Check the gross margin.
  3. Acquisition: enter CAC, or sales and marketing spend with the new customers won in the same period.
  4. Cash: enter cash in the bank and monthly expenses. Revenue uses your MRR unless you type a different figure.
  5. Read each result with its one-line meaning. Anything that can't be worked out says why, or what to add.

Frequently asked questions

How are ARPA, ARR and customer lifetime worked out?

ARPA = MRR ÷ paying customers, unless you type ARPA yourself, which then replaces that sum. ARR = MRR × 12. Customer lifetime = 1 ÷ monthly churn, so 4% churn means 25 months.

How is LTV worked out?

LTV = ARPA × gross margin ÷ monthly churn. It is the simple constant-churn formula: it assumes churn stays the same and leaves out expansion revenue and cohorts, so it is a rough guide. At 0% churn it is not defined, because the sum divides by zero, and the page says so.

How are CAC and CAC payback worked out?

Type CAC directly, or give sales and marketing spend and the new customers won in the same period: CAC = spend ÷ new customers. A CAC you type is used instead of that sum. Payback in months = CAC ÷ (ARPA × gross margin).

What LTV:CAC and payback should I aim for?

3:1 or better is a common target for LTV:CAC, and under 12 months is a common target for payback. They are rules of thumb that vary with the market and the stage of the company, so the page shows them as context and gives no verdict.

What is the difference between gross burn and net burn?

Gross burn is your monthly expenses. Net burn is expenses less monthly revenue. Leave revenue blank to use MRR, or type a different figure if your cash coming in is not the same as your MRR.

How is runway worked out?

Runway in months = cash ÷ net burn, and the month it runs out is counted from today. It is an estimate that assumes burn stays the same. If revenue covers expenses, the page says you are not burning cash instead of showing a runway.

Can I fill in only one section?

Yes. Revenue, Acquisition and Cash each work on their own. A result that needs something you have not entered says what to add. LTV:CAC and payback need both Revenue and Acquisition.

Why is gross margin 80% by default?

80% is only a starting point, often used for software. Change it to your own margin: it affects LTV, LTV:CAC and payback.

How do I type amounts like 1,20,000 or 120,000.50?

Both work. Use a dot for decimals (120000.50); commas and spaces are read as thousands separators. That means 1.234,56 written the European way is not read correctly, so type 1234.56 instead.

Is anything I type sent anywhere?

No. Everything is calculated in your browser. Only your currency and gross margin are remembered, in this browser; Clear removes them. MRR, customers, cash and the rest are not stored.

Fun facts about SaaS metrics