Marketing
How do you calculate ROAS from ad spend?
Return on ad spend and ROI percentage.
Quick answer
ROAS = revenue ÷ ad spend. €4,200 revenue on €1,000 spend: 4,200 ÷ 1,000 = 4.2×. ROI % = (ROAS − 1) × 100: 4.2× means 320% ROI on ad spend alone.
ROAS
4.2×
- ROI
- 320 %
- Gross profit
- $3,200.00
How it works
ROAS ignores product margins. A 4× ROAS on 20% margin products is profitable; on 15% margin it may break even after COGS. Subtract cost of goods and shipping before declaring a winner — blended account ROAS can hide unprofitable SKUs.
Review creative and offer tests on weekly calls — a sharp webcam 1080p helps stakeholders read landing pages you screen-share. Map promo windows in a weekly planner so Q4 spend does not chase last year's ROAS blindly. Meta-heavy shops benefit from a facebook ads book when platform attribution and bank deposits disagree.
A high ROAS does not prove the advertising created the sale. Campaigns aimed at people who already know you — brand search, retargeting recent visitors, the abandoned-cart audience — collect credit for purchases that were largely going to happen anyway, which is why those line items always look the best and why turning them off rarely costs what the dashboard implies. The number that answers the real question is incremental: run a holdout, or simply pause a channel for a fortnight and watch total revenue rather than that channel's. If the total does not move, its ROAS was measuring attribution, not demand.
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Frequently asked questions
Break-even ROAS?+
Break-even ROAS = 1 ÷ profit margin. 25% margin needs ROAS ≥ 4×. Include variable costs (payment fees, returns) in margin — Shopify’s 3% fee alone shifts the threshold.
ROAS vs ROI?+
ROAS compares revenue to ad spend only. ROI compares net profit to total investment (ads + creative + tools + salary). A 5× ROAS campaign can still be negative ROI if margins are thin.
Optimise for ROAS or conversions?+
ROAS when prices vary; conversion volume when all sales are equal value. New accounts often need conversion volume first to exit learning phase, then switch to value-based bidding.
Why does platform ROAS differ from shop analytics?+
Attribution windows, cross-device gaps, refunds not subtracted, view-through credit. Trust your bank account and cohort LTV over dashboards — reconcile weekly with UTM-tagged orders.
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