Return on ad spend ROAS

Why it matters

ROAS is the quickest read on whether an ad campaign is earning its keep. It's the number Google Ads and Meta optimise toward when you bid for value, and the one most founders check first on a Monday.

But ROAS measures revenue, not profit. A 3× ROAS is healthy for a brand with fat margins and a loss for one that keeps 25% of each sale after product, shipping and returns. Before you celebrate a number, work out your break-even ROAS: 1 divided by your margin. At a 40% margin, anything under 2.5× loses money.

How to improve it

• Fix the page before the ad. A slow product page or a checkout with surprise shipping costs drags ROAS down whatever the creative does.
• Raise the order value. Bundles, a free-shipping threshold and a sensible upsell lift revenue per order without buying a single extra click.
• Feed the platforms better signals. Server-side tracking with the Meta Conversions API and enhanced conversions in Google Ads give the algorithms real purchases to learn from.
• Refresh creative on a rhythm, before the audience tires of it, not after.

Common mistakes

• Trusting the platform's number alone. Each platform counts the sales it can claim, so their totals often add up to more than your store sold. Check against your own records.
• Chasing ROAS into a corner. Retargeting people who were about to buy anyway shows a beautiful ROAS and almost no new customers. Watch CAC alongside it.
• Reading it too early. Campaigns need time and conversions to settle; judging day three is judging noise.
• Ignoring repeat purchases. For subscriptions, schools and clinics, the first order is the smallest part of what a customer is worth.