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ROAS Calculator (Return on Ad Spend)

Return on Ad Spend = revenue generated ÷ ad spend. The single most important metric for paid acquisition. ROAS of 4.0 means every £1 spent on ads generates £4 in revenue. This calculator handles ROAS, breakeven ROAS (the floor for profitability), and target ROAS (the floor for sustainable growth).

Last verified: 25 April 2026 Source: Industry-standard ROAS definition Next review: 25 October 2026

Actual ROAS —

Performance —

Revenue per £1 of ad spend —

Breakeven ROAS —

Target ROAS for desired profit —

Profit after ad spend —

Verdict —

Healthy campaign — £500 ad spend, £2,000 revenue

£500 spend · £2,000 revenue · 40% gross margin · 15% target profit

ROAS 4.0× — every £1 of ad spend generated £4 of revenue. £2,000 × 40% gross margin = £800 gross profit. Less £500 ad spend = £300 net profit (15% net margin — exactly hitting the target). Breakeven would have required only 2.5× ROAS. Healthy performance.

Loss-making campaign — £1,000 spend, £1,500 revenue

£1,000 spend · £1,500 revenue · 40% gross margin · 15% target

ROAS 1.5× — well below the 2.5× breakeven. Gross profit £600 - ad spend £1,000 = -£400 loss. Every £1 spent on ads generates only £1.50 in revenue, which doesn’t cover the £0.60 of cost of goods on that revenue plus the £1 of ad spend. Either kill the campaign, improve targeting, or improve product margin.

Etsy seller — £200 spend, £1,500 revenue, lower margin

£200 spend · £1,500 revenue · 30% gross margin · 10% target profit

ROAS 7.5× looks excellent on paper, but with 30% gross margin (typical for Etsy resellers/printables), breakeven is 3.33× — much higher than higher-margin businesses. Target ROAS for 10% net is 5× — comfortably exceeded. £1,500 × 30% = £450 gross profit - £200 ads = £250 net. Lower-margin businesses need much higher ROAS to be sustainable.

ROAS — Return on Ad Spend — is the single most important metric for paid acquisition. It tells you whether each pound spent on ads is paying for itself, breaking even, or losing money. The calculator above shows three ROAS views: actual, breakeven, and target.

Three numbers that matter

Actual ROAS = Revenue / Ad spend

Breakeven ROAS = 1 / Gross margin %

Target ROAS = 1 / (Gross margin % - Target net margin %)

For a 40% margin business with a 15% net margin target: - Breakeven ROAS: 1 / 0.40 = 2.5× - Target ROAS: 1 / (0.40 - 0.15) = 4.0× - Anything above 2.5× is profitable; anything above 4.0× hits target net margin

Why margin matters

Same campaign, different businesses:

Business	Gross margin	Breakeven ROAS	Target ROAS (10% net)
Digital product creator	80%	1.25×	1.43×
SaaS reseller	60%	1.67×	2.0×
E-commerce brand	40%	2.5×	3.33×
Etsy reseller	30%	3.33×	5.0×
Low-margin retail	20%	5.0×	10.0×

A 4× ROAS that’s healthy for an e-commerce brand is loss-making for a low-margin reseller. Always check your margin before judging ROAS.

ROAS by ad platform — typical UK seller benchmarks

These are rough industry averages. Your specific results will vary.

Etsy Ads: 3-6× typical for established sellers; 1-3× for new/competitive niches
Pinterest Ads: 2-5× for visual-product retail
Meta Ads (Facebook/Instagram): 2-4× cold audiences; 8-15× retargeting
Google Ads (Search): 4-10× brand keywords; 2-4× non-brand
Amazon Sponsored Products: 4-8× for established listings; 2-4× during launch
TikTok Ads: 2-3× e-commerce; very high variance

These all assume reasonable gross margins. Below 30% margin, most ad platforms struggle to be profitable on cold audiences.

When ROAS misleads

First 30 days of a new campaign — attribution data incomplete
Brand vs prospecting blend — high blended ROAS often hides loss-making prospecting behind profitable brand. Always separate.
Pre-refund revenue — reported revenue doesn’t subtract returns. Deduct refund rate manually for physical products.
Last-click attribution — undervalues upper-funnel campaigns that drive eventual purchases via other channels.
Single-period view — month-to-month ROAS varies with seasonality. Use trailing-90-day for stable comparisons.

Tax: treat ad spend as deductible

UK ad spend is fully deductible against business income — Etsy Ads, Pinterest Ads, Meta Ads, Google Ads, all count. Reduces your taxable profit pound-for-pound. For multi-platform sellers tracking total ad spend, see the side hustle tax calculator for how the deductible-expenses side affects your real after-tax retention.

Common mistakes

Treating any ROAS above 1.0 as profitable. Wrong. Breakeven ROAS is 1 / gross_margin. A 30% margin business needs 3.33× ROAS to break even, not 1.0×. Anything below breakeven is loss-making — every additional pound of ad spend deepens the loss. Many beginners panic-buy ads at 1.5× ROAS thinking they’re profitable when they’re hemorrhaging money.
Confusing gross margin with net margin. Breakeven ROAS uses GROSS margin (revenue minus COGS, before fixed costs and ads). Net margin (after everything) is much lower. A business with 40% gross margin might have 5% net margin after rent, salaries, software, etc. ROAS only needs to cover ad spend at the gross-margin level — fixed costs are separate.
Not accounting for attribution lag. Reported ROAS in Meta/Google/Etsy Ads typically attributes a click within a 7-30 day window. Actual customer purchases may happen weeks later. First-month ROAS often understates true performance by 20-40%. Mature campaigns need 60-90 days of data before you can trust the ROAS number.
Optimising for ROAS at the expense of volume. A campaign with 8× ROAS but only £100/month in spend is less valuable than 4× ROAS at £5,000/month. First buys profit; second buys profit AND scale. As you increase spend, ROAS typically declines (saturation). The right level is where marginal ROAS = breakeven, not where average ROAS is highest.
Forgetting that ROAS doesn’t include refunds. Reported revenue is usually pre-refund. If your refund rate is 10%, deduct that from gross revenue before calculating ROAS. £2,000 reported - £200 refunds = £1,800 net revenue / £500 spend = 3.6× ROAS, not 4.0×.
Not adjusting target ROAS for product lifecycle. New product launch: accept lower ROAS for trial volume. Mature product: demand higher ROAS for sustainable spend. Holiday season: ad costs rise, so target ROAS may need to drop. Don’t lock yourself into one target across all conditions.

What this calculator doesn't cover

Doesn’t model attribution windows or last-click bias. ROAS as reported by ad platforms varies based on attribution model — first-click, last-click, time-decay, data-driven. Use the same model consistently when comparing campaigns.
Doesn’t include refunds, chargebacks, or returns. Net those out manually before entering revenue.
Doesn’t model lifetime value (LTV). High-LTV products can justify lower-ROAS acquisition because each customer brings repeat revenue. Use a separate LTV calculation for subscription or repeat-purchase businesses.
Doesn’t account for organic-traffic cannibalisation — ads sometimes capture buyers who would have bought organically. True incremental ROAS is harder to measure than reported ROAS.
Doesn’t model cost of fulfilment beyond cost of goods (e.g. customer support, packaging labour). Treat ‘gross margin’ as your fully-loaded margin including all variable costs.
Single-campaign focused. For multi-campaign portfolio analysis (separating brand from non-brand, prospecting from retargeting), run each separately and compare.

Frequently asked questions

What's a good ROAS?

Depends entirely on your gross margin. 40% margin: breakeven 2.5×, target 4-6×. 30% margin: breakeven 3.33×, target 5-8×. 60% margin (digital products, software): breakeven 1.67×, target 3-5×. ‘Good ROAS’ is a meaningless number without margin context — always compute breakeven first using the calculator above.

Why does ROAS decline as I increase spend?

Saturation. Your most-likely buyers see your ads first; later impressions reach lower-intent audiences who convert less often. Marginal ROAS (the return on the LAST pound spent) falls below average ROAS as you scale. The right scaling point is where marginal ROAS equals breakeven, not where average ROAS is maximised. This is why scaling beyond £X/month often hurts profitability even if total profit grows.

Should I use ROAS or CPA?

ROAS for revenue businesses (e-commerce, retail). CPA (cost per acquisition) for fixed-value or lead-gen businesses (subscriptions, B2B leads). Both measure efficiency from different angles. ROAS = revenue/spend; CPA = spend/conversions. Mature accounts track both — ROAS for revenue health, CPA for unit economics.

How does ROAS work on Etsy Ads?

Etsy Ads reports the ‘Etsy Ads conversion rate’ and revenue generated. ROAS = (revenue from Etsy Ads) ÷ (Etsy Ads spend). Etsy attribution window is shorter than Meta/Google (typically 30 days). For Etsy specifically: aim for 4×+ ROAS minimum because Etsy takes another ~14% in fees on top of ad spend (effectively shrinking your margin further).

Is brand ROAS different from prospecting ROAS?

Yes. Brand campaigns (people searching for your brand name) typically have very high ROAS (10×+) because they’re capturing demand you’ve already created. Prospecting (cold audiences) typically has much lower ROAS (1.5-3×) because you’re paying to introduce yourself. Don’t blend them — measure separately. High blended ROAS often hides loss-making prospecting behind profitable brand.

How do refunds affect ROAS?

Significantly. Reported ROAS is usually pre-refund. If 10% of orders refund: 4.0× reported ROAS = 3.6× actual. For physical products with returns, deduct refund rate from revenue before calculating. Subscription products with churn need a different framework (LTV) since ‘revenue’ depends on retention.

What's the difference between ROAS and ROI?

ROAS = revenue/ad spend. ROI = (profit - cost) / cost = profit/cost. ROAS doesn’t account for cost of goods; ROI does. A 4× ROAS might be a 60% ROI (after COGS and ads) or a -20% ROI (loss-making) depending on margin. ROAS is the right metric for ad-platform optimisation; ROI is the right metric for business profitability.

About this calculator. Maintained by Jordan — a UK seller and creator who actually uses these platforms (Etsy, eBay, Vinted, DistroKid). Built to be accurate, mobile-fast, and honest about its limits. Spot a bug? Email hello@payoutmath.co.uk.