ROAS Calculator: Measure Return on Ad Spend and Break-Even Point

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This ROAS calculator divides the revenue your ads produced by what you spent on them, then compares the result with your break-even point based on profit margin. It is for ecommerce owners, PPC managers and agencies running Google Ads, Meta, Amazon or any other paid channel. Enter revenue, spend and margin to see your ROAS, your break-even ROAS and the profit left after ad costs.

The numbers update as you type. A clear message tells you whether the campaign is profitable at your margin or losing money, so you can act before the next budget cycle.

What ROAS Shows About Your Ads

Return on ad spend tells you how much revenue each unit of ad budget brings back. It is one of the quickest ways to compare campaigns, ad sets and channels.

ROAS = revenue ÷ ad spend

The formula is simple: divide revenue attributed to ads by the cost of those ads. If a campaign spent 3,000 and produced 15,000 in sales, ROAS is 15,000 ÷ 3,000 = 5. Every 1 spent brought back 5 in revenue. The calculator uses the revenue and spend you enter, so it works with any currency and any channel. What counts as “revenue from ads” depends on your attribution settings, which is why the same campaign can show different ROAS in different tools.

Ratio vs percentage

ROAS is written either as a ratio or a percentage. A ROAS of 5 can appear as 5x, 5:1 or 500%. They all mean the same thing. Google Ads often uses a percentage for target ROAS bidding, while many ecommerce teams and Meta reports talk in ratios. The calculator shows both, so you can match whichever format your platform or client uses. Be careful when entering targets in ad platforms: typing 5 where the field expects a percentage means 5%, not 500%.

How to Use the ROAS Calculator

You need three numbers from your ad account and your own finance data.

Step 1: Enter ad spend

Enter the total cost of the ads for the period you are measuring. Use the platform’s reported cost and, if you want a stricter view, add agency fees or creative costs tied to the campaign. Keep the date range the same as the revenue figure.

Step 2: Enter attributed revenue

Enter the revenue credited to those ads. In Google Ads this is usually conversion value. In Meta it is purchase conversion value. For Amazon Ads, use attributed sales. Choose your currency so the profit figure displays correctly.

Step 3: Add profit margin

Enter your profit margin as a percentage of revenue, before ad costs. Use contribution margin if you can: revenue minus product cost, shipping, payment fees and other variable costs. Gross margin works as a first estimate but makes break-even ROAS look easier to hit than it is.

Step 4: Read ROAS and break-even

The highlighted ROAS shows your return as a ratio, with the percentage beneath it. Break-even ROAS shows the minimum return needed to cover ad costs at your margin. Profit after ads shows what is left once you subtract spend from the margin earned. If ROAS is below break-even, the message warns that the ads are losing money.

Break-Even ROAS from Your Margins

ROAS on its own does not tell you if you made money. A ROAS of 3 is great for a high-margin product and a loss for a low-margin one.

The 1 ÷ margin formula

Break-even ROAS is 1 divided by your profit margin as a decimal. At a 35% margin it is 1 ÷ 0.35, about 2.86. At 50% it is 2. At 20% it is 5. Below that number, every sale driven by ads costs more in ad spend than it earns in margin. The calculator works this out from the margin you enter, so you can see instantly how margin changes the bar you need to clear. Products with thin margins need far higher ROAS to stay profitable.

Setting a profitable target

Break-even is the floor, not the goal. Add the profit you want on top of it. One way is to decide what share of revenue you are willing to spend on ads, then set target ROAS as 1 divided by that share. If you can afford 20% of revenue on ads, target ROAS is 5. Also factor in repeat purchases: if customers buy again, a lower first-order ROAS may still pay off over time. Use the Customer Acquisition Cost Calculator to see what each new customer costs.

ROAS vs ROI vs ACoS

These three metrics are often mixed up, but each answers a different question.

What each metric includes

ROAS compares revenue with ad spend only. ROI compares profit with total investment, so it includes product costs, fees, tools and staff time. A campaign can show a healthy ROAS and a negative ROI if margins are thin. ACoS, used mainly in Amazon Ads, is ad spend divided by attributed sales, shown as a percentage. It is the inverse of ROAS: a ROAS of 4 equals an ACoS of 25%. To get ACoS from this tool’s result, divide 100 by the ROAS figure.

When to report which

Use ROAS to compare campaigns and steer bids day to day. Use ROI to judge whether advertising as a whole is worth the money, and calculate it with the Marketing ROI Calculator. Use ACoS when working inside Amazon Seller Central, where it is the default.

Attribution Limits Behind Your ROAS

ROAS is only as reliable as the revenue number behind it.

Platform over-reporting

Each ad platform credits itself for conversions it touched. If a customer clicks a Google ad and later a Meta ad, both may claim the full sale. Adding platform-reported revenue together often gives a total higher than your actual sales. View-through conversions and long attribution windows make this worse. Compare platform figures against your store or CRM data regularly.

Blended ROAS (MER)

Blended ROAS, often called MER (marketing efficiency ratio), divides total revenue by total ad spend across all channels. It ignores attribution and shows whether overall advertising grows the business. Track MER alongside channel ROAS for a reality check.

ROAS Mistakes That Hide Losses

These errors make campaigns look better than they are.

Ignoring product costs

High ROAS on a low-margin product can still lose money. Always compare ROAS with break-even ROAS, not with a generic target.

Comparing different attribution windows

A 7-day click window and a 1-day click window give different revenue. Compare campaigns only with matching settings.

Chasing ROAS over volume

Cutting spend to the best keywords raises ROAS but can shrink total profit. Watch absolute profit too, not just the ratio.

Set a ROAS Target You Can Scale On

Enter your spend, revenue and margin above to see whether your ads are really making money, then set a target ROAS that leaves room for profit. Plan budgets with the Google Ads Budget Calculator, check click costs with the CPC Calculator, or improve landing pages using the Conversion Rate Calculator. Explore every free tool on FHSEO Hub.

ROAS Calculator: Measure Return on Ad Spend and Break-Even Point FAQs

Calculate ROAS by dividing the revenue generated by your ads by the amount you spent on those ads. For example, 15,000 in revenue from 3,000 in ad spend gives a ROAS of 5, also written as 5:1 or 500%. Use the same date range and attribution settings for both numbers.

A good ROAS is any ROAS comfortably above your break-even point, which depends on your profit margin. A business with a 50% margin breaks even at 2, while one with a 20% margin needs 5. Work out your own break-even first, then add the profit you need on top.

Break-even ROAS is the return on ad spend at which ad costs exactly equal the profit margin earned from ad-driven sales. Calculate it as 1 divided by your margin as a decimal. At a 25% margin, break-even ROAS is 4. Anything lower means the ads lose money.

ROAS measures revenue earned per unit of ad spend, while ROI measures profit earned relative to total investment. ROAS ignores product costs, fees and overheads, so a campaign can have a strong ROAS and a negative ROI. Use ROAS to manage campaigns and ROI to judge overall profitability.

ACoS is the inverse of ROAS expressed as a percentage. ACoS equals ad spend divided by sales, so a ROAS of 4 means an ACoS of 25%, and a ROAS of 5 means 20%. Amazon Ads reports ACoS by default, while most other platforms report ROAS or conversion value per cost.