Is Your Google Ads ROAS Actually Profitable?
A strong ROAS does not automatically mean your advertising is profitable. Use our free calculator to estimate your current return on ad spend, break-even ROAS and maximum sustainable cost per acquisition based on your actual business margins.
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Why ROAS Alone Doesn't Tell the Whole Story
A business generating £5 for every £1 spent on advertising may appear to be performing extremely well. However, profitability depends on factors such as:
- •Gross profit margin
- •Product cost
- •Average order value
- •Delivery costs
- •Transaction fees
- •Returns
- •Operational costs
- •Advertising costs
Merchant Growth's calculator helps businesses understand the relationship between advertising spend and commercial profitability.
What would you like to calculate?
Your Numbers
Your gross profit margin after product cost but before advertising and overheads.
Optional — delivery subsidy, payment fees, packaging, commission, fulfilment.
Optional — allows calculation of a target ROAS rather than just break-even.
Enter spend, revenue, order value and margin to calculate.
Your Results
Fill in your numbers and click Calculate to see your results.
ROAS, Break-Even & Profitability Explained
What Is ROAS?
ROAS (Return on Ad Spend) measures how much revenue you generate for every pound spent on advertising. If you spend £1,000 on Google Ads and generate £4,000 in revenue, your ROAS is 4.0x. It is a useful efficiency metric, but it does not tell you whether your advertising is actually profitable.
What Is Break-Even ROAS?
Break-even ROAS is the ROAS at which your advertising neither makes nor loses money before overheads. It is determined by your gross profit margin. A business with 40% gross margins needs a ROAS of 2.5x to break even, while a business with 20% margins needs a ROAS of 5.0x. This is why two businesses with identical ROAS can have very different profitability.
What Is a Good ROAS?
There is no universal 'good' ROAS because it depends on your margins, business costs, average order value, repeat purchases and customer lifetime value. A 3x ROAS may be highly profitable for a high-margin business and unprofitable for a low-margin one. The right question is whether your ROAS exceeds your break-even ROAS with enough buffer to cover overheads and deliver profit.
What Is CPA?
CPA (Cost Per Acquisition) is how much you pay to acquire one customer or order. For ecommerce, it is calculated as advertising spend ÷ number of orders. Your maximum break-even CPA is the most you can pay before an order becomes unprofitable. Keeping your CPA below this figure is essential for sustainable advertising.
Why Gross Margin Matters
Gross margin is the single biggest factor in advertising profitability. Two businesses with identical ROAS, ad spend and revenue can have completely different profit outcomes. A 50% margin business breaking even at 2.0x ROAS has far more room to invest in growth than a 20% margin business needing 5.0x ROAS just to break even.
ROAS vs Profit
ROAS measures revenue efficiency. Profit measures commercial reality. A business generating £50,000 from £10,000 in ad spend (5x ROAS) may be profitable or loss-making depending on margins and costs. Focusing on ROAS alone can lead to scaling unprofitable campaigns. The most successful ecommerce businesses manage both metrics together.
ROAS & Break-Even FAQs
Important Information
The Merchant Growth ROAS & Break-Even Calculator provides indicative calculations based entirely on the figures entered by the user. Results do not constitute financial advice, accounting advice or a guarantee of advertising performance. Actual profitability can be affected by VAT, returns, discounts, delivery costs, payment fees, operating expenses, customer lifetime value and other business costs not included in the calculation. Businesses should use their own verified financial information when making advertising decisions.