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Subscription Revenue (MRR) Calculator

Business & documents · Done in 3 steps

Stays on your deviceFree · No sign-up
  1. 1Enter your numbers
  2. 2
  3. 3
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About

Project MRR and ARR month by month from new customers, growth, churn and expansion, with LTV, LTV:CAC, CAC payback and a chart.

How to use it

  1. 1Enter customers today, average revenue per customer and new customers per month.
  2. 2Set acquisition growth, monthly churn and expansion.
  3. 3Add CAC and gross margin to get LTV, LTV:CAC and payback.
  4. 4Hover the chart for any month, and download the monthly table as CSV.
You give
Starting customers, ARPA, new customers, growth, churn, expansion, CAC, gross margin and horizon.
You get
MRR/ARR projection chart, monthly table (CSV) and unit-economics stats.
Good to know
A simple cohort-free model: churn and expansion apply evenly to all customers, and there is no seasonality. Use it to compare scenarios, not as an accounting forecast.
Privacy
Processed on your device. Nothing is uploaded, stored or logged.
Last tested
2026-10-28

FAQ

How is LTV calculated?

LTV = ARPA × gross margin ÷ monthly churn. With $49 ARPA, 80% margin and 3% churn, LTV ≈ $1,307. It's undefined at 0% churn, which is why the tool warns you.

What is a good LTV:CAC ratio?

Around 3:1 or better is the common rule of thumb for subscription businesses, with CAC paid back in under 12 months. Below 1:1 you lose money on every customer.

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