EcommercePPCCalculators

How to use the three together

1. 01Start with break-even ROAS. This is the floor. Any campaign below this is losing money on every order, regardless of what the dashboard says.
2. 02Then run POAS. This converts headline ROAS into profit per pound spent. It tells you whether your "good" campaigns are actually contributing margin, or just covering variable cost.
3. 03Finally, run CSS savings. If you spend on Google Shopping or Performance Max, switching to a CSS partner gives you ~20% more bidding power immediately. This is the only lever that moves both ROAS and POAS upward at the same time without changing strategy.

All three pull from the same dataset: our Q1 2026 benchmarks of 75+ UK ecommerce accounts. Definitions for every metric used live in the PPC glossary.

Who these are built for

Founders, finance leads and in-house performance teams running £10k/month or more on Google Ads who suspect the dashboard ROAS is hiding the real story. None of them require account access, sign-up, or a sales call. Plug in numbers, get the answer.

If you want the same calculation done against your real account data - with COGS, returns and shipping reconciled to your P&L - that is what a profit audit covers.