CAC payback calculator

Months to recover CAC at your gross margin, with LTV:CAC banding.

Free · runs in your browser

Inputs

Sales & marketing spend

Per month

New customers

Same month

ARPA

Revenue per account / mo

Gross margin

Monthly churn

CAC

$150

Spend / new customers

Payback

4.2 mo

CAC / (ARPA × margin)

LTV

$1,200

Margin ARPA × lifetime

LTV : CAC

8.0×

Healthy (≥3×)

Rules of thumb: payback under 12 months and LTV:CAC above 3× are what most SaaS buyers look for.