Free tool

ROAS Calculator: Calculate Revenue Returned for Every Ad Dollar

Seed Light built this free ROAS calculator to show what each unit of ad spend brings back in attributed revenue. It covers Google, Meta and TikTok, and shows whether the return clears break even.

Enter ad spend and the revenue behind it, and get your return, cost per sale and contribution.

Your ad account numbers

What you spent on ads

One platform, one period. Google, Meta or TikTok.

Revenue attributed to those ads

The conversion value your ad platform reports, on whatever attribution setting it is using.

How many sales that was

Orders, bookings or closed jobs.

Contribution margin before advertising

Out of every 100 in sales, what is left after the variable cost of fulfilling the order and before any advertising.

Your result

Enter your numbers and your result will appear here. The calculation runs in your browser.

Talk through your result

Book a free 15-minute call and we will help you read the numbers and decide what is worth improving first.

We record the result band you reach, not the numbers you enter.

Free to use, with no sign up. The calculation runs in your browser, so the values you enter are not sent to our server or stored.

The maths

How this calculator works

01
Attributed revenue divided by spend
That is ROAS, and it is a multiple rather than a percentage. Four times means four units of attributed revenue for every one you spend on media.
02
Your margin sets the bar
One hundred divided by your margin gives the ROAS you need just to break even. A forty percent margin needs two and a half times before you make anything.
03
Cost per sale keeps you honest
Spend divided by the number of sales. It is the figure that tells you whether a rising ROAS came from real efficiency or from a few unusually large orders.
04
Contribution is the point
Attributed revenue multiplied by your contribution margin, with the media spend taken off. That is estimated contribution after media spend, not company profit, because overheads, fees and tools sit outside it.

A worked example

An online store runs a Meta campaign for a month. Its contribution margin is forty in every hundred, so it needs two and a half times before the campaign contributes anything at all. Example only. Replace these assumptions with your own numbers.

Ad spend: 1 unit
Revenue attributed to the ads: 4 units
ROAS: 4 times
Contribution margin: 40 in 100
Break even ROAS: 2.5 times
Result: Above the entered break even level

See how we run ads

Straight answers

Common questions

Common questions about the calculation and how to use the result.

There is no single good number, because it depends entirely on your margin. A store keeping seventy in each hundred is profitable at one and a half times.

The ad platform may claim revenue using its own attribution rules, while the accounts record completed sales and adjustments. Compare the same date range, remove cancelled or refunded orders and note any sales that cannot be linked to one campaign.

Usually no. Standard ROAS divides attributed sales by media spend only. Include agency fees when assessing total marketing return instead.

ROAS can fall after a budget increase when the earlier spend already reached the people most likely to buy. Review the change against your account figures and setup to see whether the added budget reached a broader audience that returned less revenue per unit of spend.

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