ROAS Calculator – Return on Ad Spend
Calculate your return on ad spend (ROAS) from revenue and advertising cost, estimate profit after advertising, and test how different revenue levels change your ROAS.
Written by the CalcBundle Research & Editorial Team · Reviewed by the Quality Review Team · Transparent formulas · results are estimates, not advice. · Updated
Return on ad spend
Enter an advertising spend greater than zero.
What is a ROAS calculator?
A ROAS (return on ad spend) calculator shows how much revenue your advertising generates for every dollar spent. It is the headline metric most e-commerce and performance marketers watch — but it measures revenue, not profit, so it is only half the picture.
How is ROAS calculated?
- ROAS = Revenue attributed to ads ÷ Advertising spend
A $2,000 campaign that drives $8,000 in sales has a ROAS of 4.0x, or 400%. Enter a gross margin (or product cost) and the calculator also estimates your profit after advertising.
ROAS vs ROI vs profit
ROAS compares revenue to ad spend. ROI compares profit to what you invested, so it accounts for product costs, fees and overhead. Two campaigns with an identical 4x ROAS can have very different profitability depending on margins. Always read ROAS alongside your profit margin and contribution margin.
Why a high ROAS is not always enough
Because ROAS ignores the cost of the product, a 5x ROAS on a product with a 20% margin can still be unprofitable after fees and overhead. That is why the break-even ROAS calculator is essential — it tells you the minimum ROAS you need just to cover your variable costs.
Blended ROAS vs channel ROAS
One of the most useful distinctions in performance marketing is between the ROAS a single channel reports and the blended figure across your whole business. Each ad platform tends to claim credit for conversions using its own attribution, so if you simply add up the revenue Meta, Google and every other channel report, you often get a total larger than your actual sales — the same order counted more than once. Blended ROAS (also called MER) sidesteps this by dividing your real total revenue by your total marketing spend. It cannot be inflated by attribution, which makes it the honest scoreboard: if channel ROAS looks strong but blended ROAS is weak, attribution is flattering your individual campaigns.
Worked example
Ad spend of $2,000 generating $8,000 of attributed revenue is a 4.0x ROAS. At a 50% gross margin that $8,000 carries $4,000 of gross profit, so after subtracting the $2,000 of ad spend you are left with roughly $2,000 of profit — genuinely profitable. Now run the same 4.0x ROAS on a product with a 20% margin: the $8,000 of revenue holds only $1,600 of gross profit, less than the $2,000 spent to generate it, so the campaign loses money despite an identical, healthy- looking ROAS. That contrast is the entire reason ROAS must always be read alongside margin.
Related calculators
Find your minimum ROAS with the break-even ROAS calculator, set a profitable price with the product pricing calculator, and see full unit economics in the e-commerce profit calculator.
Frequently asked questions
What is ROAS?
ROAS (return on ad spend) is the revenue generated for every unit of currency spent on advertising. A ROAS of 4x means $4 of attributed revenue for every $1 of ad spend.
How is ROAS calculated?
ROAS = revenue attributed to ads ÷ advertising spend. For example, $8,000 revenue from $2,000 of ad spend is a 4x ROAS (or 400%).
What is a good ROAS?
There is no universal number. A profitable ROAS depends on your margins, fees and overhead. A business with thin margins needs a much higher ROAS than one with high margins. Use the break-even ROAS calculator to find your own threshold.
What is the difference between ROAS and ROI?
ROAS compares revenue to ad spend only. ROI (return on investment) compares profit to total investment, accounting for product costs, fees and overhead. ROAS can look great while ROI is negative.
Why doesn't a high ROAS always mean high profit?
ROAS ignores the cost of goods, payment and marketplace fees, shipping and fixed overhead. A high ROAS on a low-margin product can still lose money once all costs are included.
What is the difference between ROAS and MER?
ROAS is usually measured per campaign or channel using attributed revenue, so it can double-count and is sensitive to how attribution is set up. MER — marketing efficiency ratio, or blended ROAS — is total revenue divided by total marketing spend across everything. MER is harder to game because it uses real top-line revenue rather than platform-reported conversions, which is why many operators watch blended MER as the truth check on their individual channel ROAS figures.
How does attribution affect ROAS?
Enormously, because ROAS is only as trustworthy as the revenue attributed to the ads. Different attribution windows and models — last-click, first-click, view-through — can assign the same sale to different channels, so each platform often claims credit for revenue another also claims. This is why the ROAS reported inside an ad platform frequently overstates true incremental return, and why comparing it against blended results and actual profit matters before you scale spend based on it.
Should I optimise for ROAS or for profit?
Profit, always — ROAS is only a proxy for it. Chasing a very high ROAS often means being too conservative, capping spend on campaigns that could profitably scale, while a lower ROAS on high volume can generate far more total profit. The goal is to spend up to the point where the last dollar of ad spend still earns more than it costs, which is a profit question. Use ROAS as a fast daily gauge, but let profit and your break-even ROAS set the actual targets.
Related calculators
Break-Even ROAS
Find the minimum ROAS that covers your costs, from your contribution margin.
E-commerce Profit
Calculate net profit, margin, break-even price and maximum ad spend for a product.
Product Pricing
Find a profitable selling price from costs, fees, ads and target margin.
E-commerce CAC
Calculate e-commerce customer acquisition cost, CAC % of AOV and LTV:CAC.
E-commerce LTV
Estimate e-commerce customer lifetime value from AOV and repeat purchases.
Disclaimer. This calculator provides estimates for informational purposes only. Results are based on the information you enter and the assumptions used by the calculator. Actual financial, tax, business valuation, lending, marketplace or investment outcomes may differ. Consider consulting a qualified professional for decisions involving significant amounts of money. ROAS is a revenue-based advertising metric and does not by itself measure overall business profitability.