What is ROAS Calculator?
ROAS (return on ad spend) measures how much revenue each advertising dollar produced: revenue divided by ad spend. It is the fastest read on a campaign, but on its own it says nothing about profit, because revenue is not margin. A 4× ROAS on a product with a 60% gross margin is excellent; the same 4× on a 15% margin product loses money. This calculator therefore reports ROAS, ACoS (the same ratio expressed as a percentage of revenue from the advertiser's side) and, crucially, the gross margin and profit left after ads, with a verdict against your break-even ROAS.
Common Uses for ROAS Calculator
- Check yesterday's campaign before increasing the budget
- Set a target ROAS that reflects your actual product margin
- Compare ROAS across products, channels or creative sets
- Explain to a client why a 3× ROAS is running at a loss
- Decide when to pause a scaling test
Break-even ROAS = 100 ÷ gross margin %
A 25% margin needs 4× ROAS to break even, 35% needs 2.86×, 50% needs 2×, 60% needs 1.67×. Below that line every extra order increases your loss, which is why fast growth at a 1.5× ROAS is a way to run out of cash faster, not a growth strategy.
Profit after ads, not profit on paper
Gross profit = revenue × margin. Profit after ads = gross profit − ad spend. On $4,800 revenue at 35% margin you start with $1,680 of gross profit and hand $1,200 to the ad platform, keeping $480 — a 10% net margin on revenue and a 40% return on ad spend. That is the number to compare with your overhead.
Watch ACoS drift when you scale
Reach-driven expansion usually pushes ACoS up as you leave the highest-intent audiences. Re-run this calculator at your projected spend and revenue before each budget increase, and stop where profit after ads stops growing.