GlenCalc

SaaS metrics calculator

A few numbers describe the health of a subscription business: how much recurring revenue it has, how long customers stay, and whether each one is worth more than it costs to win.

Your answer

Monthly recurring revenue$25,000.00
Customer lifetime value$1,333.33
Annual recurring revenue$300,000.00
Average customer lifetime33.3 months
LTV to CAC4.4 : 1
CAC payback7.5 months
  • This simple LTV assumes churn stays constant and ignores expansion revenue.

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How we worked it out

Updated as you change the numbers.

  1. MRR = customers × monthly revenue per customer. ARR = MRR × 12.
  2. Lifetime = 1 ÷ monthly churn. LTV = monthly revenue × gross margin ÷ monthly churn.
  3. LTV to CAC = LTV ÷ CAC.

Method and assumptions

The common subscription formulas: lifetime is one divided by the monthly churn rate, and lifetime value is monthly gross profit per customer multiplied by that lifetime.

Questions

What is LTV at $50 a month, 80% margin and 3% churn?

$1,333.33: $40 of monthly gross profit over an average lifetime of 33.3 months.

Sources

Method and figures checked on October 31, 2026. Every worked answer on this page is covered by an automated test. Found a mistake? Tell us.

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