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Unit Economics Calculator

Eight numbers in, the whole acquisition model out. ARPA, LTV, CAC both ways, the ratio, and how many months each customer takes to pay for themselves.

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Your numbers

Pre-filled with a plausible $4.2M ARR business. Replace with yours; everything recalculates as you type. Nothing leaves your browser.

Current ARRCustomersGross margin %subscription gross margin, typically 70-85% for B2B SaaSAnnual revenue churn %gross ARR churn over the trailing 12 monthsS&M spend, fully loaded (TTM)programs + salaries + commissions + toolsS&M spend, programs only (TTM)optional: campaign and program spend without people costsNew customers (TTM)New ARR (TTM)

ARPA

$23,333

new cohort lands at $27,778 (above the installed base)

ARR / customers

LTV

$151.7K

8.3-year expected lifetime at 12% churn

ARPA x (1 / churn) x gross margin

CAC, fully loaded

$35,556

marginal CAC $12,222: people costs are 2.9x of program spend

fully loaded S&M (TTM) / new customers (TTM)

LTV : CAC

4.3x

healthy from 3x; below 1x the model loses money

LTV / fully loaded CAC

CAC payback

20 months

strong under 12 months, acceptable to 24

CAC / (new-cohort ARPA x gross margin / 12)

Expected lifetime

8.3 years

1 / annual churn rate

Board-ready efficiency metrics? ARR & Board Reporting →

Next step

Unit economics tell you whether to grow. At Pace builds the operating rhythm that decides how.

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METRIC DEFINITIONS: ARPA · LTV · CAC · LTV:CAC RATIO · CAC PAYBACK