Know the metrics behind your SaaS growth.
Turn one month of revenue, customer, and acquisition data into the core metrics bootstrapped founders use to understand retention and unit economics.
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One month of inputs
Use customers at the start of the month so churn and ARPU share the same baseline.
REVENUE
$5,000
MRR
$60,000
ARR
$42
ARPU / month
RETENTION
UNIT ECONOMICS
Benchmarks vary by market and stage. LTV uses ARPU × gross margin ÷ monthly churn; CAC uses acquisition spend ÷ new customers.
SaaS metrics included
This calculator covers recurring revenue, average revenue per customer, customer churn, customer acquisition cost, estimated lifetime value, LTV:CAC, and CAC payback. Together they show whether growth is being retained and how efficiently new customers are acquired.
Retention metrics
Customer churn measures the share of starting customers lost during the month. Annualized churn compounds that monthly rate over 12 months; it is not monthly churn multiplied by 12.
Unit economics
CAC measures acquisition spend per new customer. LTV estimates gross-margin contribution across the expected customer lifetime implied by monthly churn.
How to read LTV:CAC and payback
A 3× LTV:CAC ratio and a payback period within 12 months are common planning references, not universal rules. Bootstrapped founders should compare the snapshot with their cash position, sales cycle, customer concentration, and the reliability of the churn sample.
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