Free tool · Scale

CAC & Ad Spend Calculator

Find out if your website traffic is actually making you money. Same formula as the retail version — ad spend is just the online equivalent of rent. It buys you traffic instead of a location. Ballpark numbers below, overwrite with your real ones.

Your numbers

Monthly website trafficballpark: 10,000

Conversion rate2%

Average order value£45

Gross margin45%

Monthly ad spendballpark: £3,000

Monthly platform & toolingShopify, Klaviyo, apps

Monthly staff / agency costsballpark: £2,000

Other monthly fixed costsballpark: £200

What this traffic is actually delivering

Net profit / (loss), per month

£0

Monthly orders—

Monthly revenue—

Monthly gross profit—

Total monthly costs—

Your current CAC (cost per order) —

Maximum sustainable CAC —

Enter your numbers to see the gap.

Before you rely on this for a real decision: conversion rate is the number most worth double-checking — Shopify's own analytics, GA4, and your ad platform's reporting frequently disagree on it, sometimes by a lot. If your real conversion rate is uncertain, treat the max CAC figure as a ballpark too, not a bidding target to set live today.

CAC & Ad Spend Calculator

Your numbers

What this traffic is actually delivering

Want this checked against your real accounts?