CAC · Break-even Calculator

Ad ROI Calculator

See what each lead costs (CPL) and each paying customer costs (CPA), compare against customer value — then back-calculate the ad spend you need to break even. Rough, but enough to steer by.

Ad budget

Customer value (avg first deposit)

Cost per lead (CPL)$8

Lead → paying rate9%

Show uncertainty band (Monte Carlo, 3000 sims)

Unit economics

CPL per lead

CPA per customer

$89

Customer value

$150

ROAS multiple

1.69×

Value $150 vs CPA $89 — above value = each customer loses money

This budget gets you

Expected revenue$8,438

Leads

625

Paying customers

Gross profit (revenue − spend)$3,438profit

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Rough estimate assuming stable conversion and output scaling ~linearly with spend. Actuals vary with creative, season, auction, and retention. ROAS = customer value ÷ CPA.