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SaaS Metrics Calculator

Plug in a handful of subscription numbers — customers, ARPU, churn, CAC, gross margin — and get the full unit-economics scorecard: MRR, ARR, customer LTV, payback period, LTV:CAC ratio, net revenue retention, and quick ratio with rule-of-thumb verdicts.

Inputs

$
%
Revenue minus cost-of-revenue (hosting, support, payment fees).
%
Logo + dollar churn (customers leaving / shrinking).
%
Upsell, seat growth, plan upgrades (% of MRR).
$
Fully-loaded sales + marketing / new logos.
%
For discounted-LTV; use cost of capital or 10%.

Headline metrics

Unit economics

How these numbers are computed

MRR
customers × ARPU. ARR is simply 12 × MRR.
Net revenue retention (NRR)
(1 − gross churn) + expansion on a monthly basis, annualised by raising to the 12th power.
Average customer lifetime
1 / gross churn months — the expected time before a paying customer cancels at the current churn rate.
LTV (simple)
ARPU × gross margin / gross churn. Multiplies gross-profit per month by the expected lifetime in months.
LTV (discounted)
Same gross-profit stream but discounted at the chosen rate to account for the time value of money — usually 20–30% lower than the simple LTV.
Payback period
CAC / (ARPU × gross margin) months. How long it takes a single new customer's gross profit to repay the CAC spent to acquire them.
LTV : CAC
Ratio of lifetime value to acquisition cost. Healthy SaaS sits at 3× or higher; below 1× the business loses money on every new customer.
Quick ratio
(new MRR + expansion MRR) / (churn MRR + contraction MRR). Bessemer's rough indicator: ≥4 means growth comfortably outruns leak.