ROAS (Return on Ad Spend) is the most widely used metric for evaluating paid advertising in ecommerce. But a good ROAS for one business can be a loss-making ROAS for another. Here is everything you need to know.
Calculate your ROAS and break-even point with the ROAS Calculator.
What Is ROAS?
ROAS = Revenue from Ads / Ad Spend
If you spend £500 on Google Ads and generate £2,000 in revenue from those ads, your ROAS is 4x (or 400%).
ROAS measures revenue efficiency but tells you nothing about profitability on its own. A 10x ROAS is excellent if your margin is 40%. A 10x ROAS could still be unprofitable if your margin is 5%.
The Break-Even ROAS Formula
Break-Even ROAS = 1 / Gross Margin (as a decimal)
Your gross margin here means the margin after all costs except advertising.
Examples:
- 40% gross margin: break-even ROAS = 1 / 0.40 = 2.5x
- 25% gross margin: break-even ROAS = 1 / 0.25 = 4x
- 15% gross margin: break-even ROAS = 1 / 0.15 = 6.7x
A business with thin margins needs very high ROAS to be profitable. This is why low-margin products are hard to scale with paid ads.
ROAS vs ROI: What Is the Difference?
ROAS = Revenue / Ad Spend (measures revenue efficiency) ROI on Ad Spend = (Profit from Ads - Ad Spend) / Ad Spend (measures profit efficiency)
ROAS is simpler but can mislead. ROI on ad spend is more revealing. If your ROAS is 4x but your profit margin is only 20%, your ROI on ad spend is 60% (not 300%). The ROAS Calculator shows both metrics.
Platform-Specific ROAS Benchmarks
Different platforms and industries have different average ROAS levels:
| Platform | Average Ecommerce ROAS |
|---|---|
| Google Shopping | 3-5x |
| Facebook/Meta Ads | 2-4x |
| Amazon PPC | 3-6x |
| TikTok Ads | 1.5-3x |
These are averages. Your break-even ROAS is what matters, not industry averages.
How to Improve ROAS
- Raise average order value — higher AOV means more revenue per click without changing ad costs
- Improve conversion rate — better product pages, faster site speed, stronger social proof
- Tighten audience targeting — reduce spend on audiences that browse but do not buy
- Improve product margin — negotiate better supplier costs or shift to higher-margin products
- Add retargeting — customers who have already visited convert at much higher rates and lower CPA
Common ROAS Mistakes
- Reporting ROAS without including all ad costs — some sellers only count media spend and forget agency fees, creative production, and tools
- Using overall ROAS to evaluate individual campaigns — a 4x overall ROAS can hide one losing campaign dragging down a winning one
- Optimising for ROAS instead of profit — a campaign at 6x ROAS on a low-margin product may generate less actual profit than a 3x ROAS campaign on a high-margin product
- Ignoring attribution windows — different platforms attribute conversions differently; compare like for like
Model your advertising profitability before scaling any campaign with the ROAS Calculator.