Return on Ad Spend (ROAS) measures the revenue generated for every pound spent on advertising. A ROAS of 4x means you earn £4 in revenue for every £1 spent on ads.
Return on Ad Spend (ROAS) measures the revenue generated for every pound spent on advertising. A ROAS of 4x means you earn £4 in revenue for every £1 spent on ads.
ROAS = Revenue from Ads ÷ Cost of Ads ROAS is the primary metric for evaluating advertising performance in ecommerce. It tells you whether your ad campaigns are generating enough revenue to justify their cost. However, ROAS measures revenue, not profit. A 4x ROAS sounds impressive, but if your margins are only 20%, you are barely breaking even on ad spend. Smart ecommerce operators set ROAS targets based on their margin structure, not arbitrary benchmarks.
ROAS = Revenue from Ads ÷ Cost of Ads You spend £2,000 on Google Shopping ads and generate £8,000 in attributable revenue. Your ROAS is £8,000 ÷ £2,000 = 4x. For every £1 spent, you earned £4 in revenue. Whether this is profitable depends on your margins.
ROAS determines whether scaling ad spend will grow your business or drain it. Without tracking ROAS, you are flying blind on your biggest variable expense. It also helps you allocate budget between channels and campaigns based on performance.
Targeting a ROAS number without knowing what ROAS you need to be profitable
Comparing ROAS across platforms without accounting for different attribution models
Treating ROAS as a profit metric when it only measures revenue efficiency
StoreLyst connects your ad spend to actual profit, not just revenue. You see profit-adjusted ROAS (pROAS) that accounts for COGS and fees, so you know exactly which campaigns are truly profitable.
Learn more about Google Ads →It depends entirely on your margins. A store with 60% gross margins can be profitable at 2x ROAS, while a store with 25% margins needs 5x or higher. Calculate your break-even ROAS first: Break-Even ROAS = 1 ÷ Gross Margin Percentage.
ROAS measures revenue relative to ad spend only. ROI (Return on Investment) measures net profit relative to total investment including all costs. ROAS is a top-line metric; ROI is a bottom-line metric. Both are useful for different decisions.
Different platforms use different attribution models. Google may credit a sale to a click that happened 30 days ago, while Shopify attributes it to the last click. Neither is wrong; they measure differently. Use one consistent source for ROAS decisions.
Improve ad targeting to reach higher-intent audiences, optimise product feeds for relevance, improve landing page conversion rates, increase AOV through upsells, and regularly prune underperforming keywords or audiences. Better creative also drives higher click-through and conversion rates.
Stop calculating in spreadsheets. Get real-time roas tracking for your Shopify store.