ROAS Calculator
Return on ad spend.
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About ROAS Calculator
The ROAS Calculator works out your return on ad spend in seconds. Enter the revenue your ads generated and how much you spent, and it shows ROAS as a clean multiple (like 4.0x) alongside your ACOS percentage. Add an optional profit margin to also see your actual profit after ad spend and the break-even ROAS you need to hit.
It is completely free with no sign-up, and everything runs entirely in your browser. Your revenue, spend, and margin numbers never leave your device and are never uploaded to a server, so you can check campaign math privately whenever you need it.
Frequently asked questions
- What is ROAS and how is it calculated?
- ROAS (return on ad spend) measures how much revenue you earn for every dollar spent on advertising. It is calculated as revenue divided by ad spend. For example, $4,000 in revenue from $1,000 in ad spend is a ROAS of 4.0x, meaning you made four dollars back for each dollar spent.
- What is the difference between ROAS and ACOS?
- They are two sides of the same coin. ROAS is revenue divided by ad spend, shown as a multiple like 4.0x. ACOS (advertising cost of sales) is ad spend divided by revenue, shown as a percentage. A 4.0x ROAS equals a 25% ACOS. Amazon sellers tend to use ACOS, while most other advertisers track ROAS.
- How do I calculate break-even ROAS?
- Break-even ROAS is 1 divided by your profit margin (as a decimal), or 100 divided by your margin percentage. If your profit margin is 40%, your break-even ROAS is 2.5x — meaning you must earn at least $2.50 in revenue per ad dollar just to cover the product cost plus the ad spend. Enter your margin in this calculator to see it automatically.
- Is this ROAS calculator free to use?
- Yes, it is 100% free with no account, sign-up, or limits. Use it as often as you like.
- Is my data uploaded or stored anywhere?
- No. The calculator runs entirely in your browser, so your revenue, ad spend, and margin figures never leave your device and are never sent to or stored on any server. Nothing is uploaded.
- What is a good ROAS for my campaigns?
- It depends on your profit margin, not a universal number. A 3x–4x ROAS is a common baseline for e-commerce, but a business with thin margins may need a much higher ROAS to profit, while a high-margin business can profit at a lower one. The most reliable target is any ROAS above your break-even ROAS, which this tool calculates when you enter your margin.