What is break-even ROAS?
ROAS (return on ad spend) is the revenue your ads bring in for every dollar spent. A ROAS of 3x means $3 of sales for each $1 of ads. Revenue isn’t profit, though. Once you subtract product cost, shipping and platform fees, a 3x ROAS can still lose money.
Break-even ROAS is the point where the profit from ad-driven sales exactly pays for the ads. It depends only on your margin:
Break-even ROAS = 1 ÷ Profit margin before ads
Profit margin = (Price − Product cost − Shipping − Fees) ÷ Price
To aim for real profit rather than zero, subtract your target margin first:
Target ROAS = 1 ÷ (Profit margin − Target profit margin)
Worked example
You sell a $50 product on Shopify. It costs $15 to make and $6 to ship. Shopify Payments takes 2.9% + $0.30, so $1.75. Profit before ads is $50 − $15 − $6 − $1.75 = $27.25, a 54.5% margin.
- Break-even ROAS = 1 ÷ 0.545 = 1.83x. Break-even ACoS = 54.5%.
- For a 15% profit after ads: 1 ÷ (0.545 − 0.15) = 2.53x target ROAS.
- Your maximum cost per acquisition (CPA) is $27.25 per order. Pay more than that to win a customer and you lose money on the first order.
ROAS vs ACoS
| ROAS | ACoS | Profitable if margin before ads is above… |
|---|---|---|
| 2x | 50% | 50% |
| 3x | 33.3% | 33.3% |
| 4x | 25% | 25% |
| 5x | 20% | 20% |
Amazon reports ACoS (ad spend ÷ sales). Google and Meta report ROAS (sales ÷ ad spend). They’re the same number flipped: ACoS = 1 ÷ ROAS. Your break-even ACoS equals your margin before ads. Get that margin for an Amazon product from our Amazon FBA calculator.
Using your target ROAS in ad platforms
- Google Ads: enter the target ROAS as a percentage in a tROAS bid strategy. 2.53x is 253%. Make sure purchase conversions send the real order value.
- Meta Ads: use the minimum ROAS (ROAS goal) bid strategy and set it at or above your target ROAS.
- Amazon PPC: set keyword bids so campaign ACoS stays under your target ACoS. Allow higher ACoS only on launch or brand-defense campaigns.
All of these depend on accurate conversion values. If GA4 or your pixel double-counts or misses purchases, your reported ROAS is wrong. Check tracking before you change bids.
Frequently asked questions
What is break-even ROAS?
The ROAS where ad-driven sales cover the ad cost and nothing more. It equals 1 divided by your profit margin before ads. Below it, every sale from ads loses money.
How do I calculate break-even ROAS?
Work out profit per order before ads, divide by the price to get your margin, then divide 1 by that margin. A 40% margin gives a break-even ROAS of 2.5x.
What is the difference between ROAS and ACoS?
ROAS is revenue ÷ ad spend. ACoS is ad spend ÷ revenue. A 4x ROAS equals a 25% ACoS.
What is a good ROAS?
One above your break-even ROAS, with room for your profit target. A 3x ROAS is great for a 60% margin product and loss-making for a 25% margin product.