Break-even ROAS is the return on ad spend at which ads use up all the profit from the sales they bring. The formula is 1 ÷ your profit margin before ad spend. A product that keeps 40% of its price after product cost, fees and shipping has a break-even ROAS of 1 ÷ 0.40 = 2.5: every $1 of ads must bring $2.50 in sales.
Our free ROAS calculator works out break-even ROAS, break-even ACoS and break-even CPA from your costs. This guide explains the formula, shows why using gross margin gives a dangerously low answer, and works through examples that include marketplace fees, payment processing, shipping and returns.
- Break-even ROAS = 1 ÷ margin before ads (as a decimal).
- Margin before ads = (price − product cost − fees − shipping and packing − other per-order costs) ÷ price.
- Example: $40 price, $25.50 of non-ad costs, 36.25% margin, break-even ROAS 2.76. Using gross margin instead would wrongly say 1.43.
- Break-even ACoS equals your margin before ads (36.25%). Break-even CPA is the profit per order before ads ($14.50).
- Bigger orders lower break-even ROAS, because shipping and fixed fees are spread over more revenue.
What is the break-even ROAS formula?
Break-even ROAS = 1 ÷ profit margin before ad spend. If you prefer to work in money rather than percentages, it's price ÷ profit per order before ads.
Why it works: at a 40% margin, each $1 of sales leaves 40 cents to pay for ads. To cover $1 of ads you need $1 ÷ $0.40 = $2.50 in sales. Above 2.5, the ads leave profit; at exactly 2.5, they pay for themselves and nothing more; below 2.5, every ad sale loses money.
| Margin before ads | Break-even ROAS | Break-even ACoS |
|---|---|---|
| 20% | 5.00 | 20% |
| 25% | 4.00 | 25% |
| 30% | 3.33 | 30% |
| 35% | 2.86 | 35% |
| 40% | 2.50 | 40% |
| 50% | 2.00 | 50% |
| 60% | 1.67 | 60% |
How to calculate break-even ROAS step by step
Add up every cost of one order except advertising, subtract it from the price, divide by the price, then take 1 divided by that.
- Price: what the buyer pays for the item (or your average order value).
- Product cost (COGS): what one unit costs you, including inbound freight.
- Percentage fees: marketplace commission and payment processing, worked out on the price.
- Fixed per-order fees: for example a fixed processing charge or listing fee.
- Shipping and packing you pay for the order.
- Returns allowance if returns are common (see below).
- Margin before ads = (price − all of the above) ÷ price.
- Break-even ROAS = 1 ÷ margin before ads.
Worked example: a $40 product with fees and shipping
The fee rates below are placeholders (15% marketplace fee, 3% + $0.30 processing). Use the current rates from your own platform's fee page.
| Line | Calculation | Amount |
|---|---|---|
| Price | $40.00 | |
| Product cost | $12.00 | |
| Shipping and packing | $6.00 | |
| Marketplace fee (15%) | 40 × 0.15 | $6.00 |
| Processing fee (3% + $0.30) | 40 × 0.03 + 0.30 | $1.50 |
| Costs before ads | $25.50 | |
| Profit before ads | 40.00 − 25.50 | $14.50 |
| Margin before ads | 14.50 ÷ 40.00 | 36.25% |
| Break-even ROAS | 1 ÷ 0.3625 | 2.76 |
So this product needs at least $2.76 of ad-attributed sales for every $1 of ads. At a ROAS of 3.5, $1,000 of ads brings $3,500 in sales, $1,268.75 of profit before ads, and $268.75 after ads. At a ROAS of 2.0, the same spend brings $2,000 in sales, $725 before ads, and a $275 loss.
Gross margin only subtracts product cost: (40 − 12) ÷ 40 = 70%, which gives a break-even ROAS of 1.43. That number ignores $13.50 of fees and shipping per order. A seller who thinks 2.0 is profitable because it beats 1.43 is actually losing money on every ad sale. Always subtract fees and shipping first.
Break-even ACoS and break-even CPA
Break-even ACoS is your margin before ads, and break-even CPA is your profit per order before ads.
Amazon sellers usually work in ACoS (ad spend ÷ ad sales), which is 1 ÷ ROAS. In the example, break-even ACoS = 36.25%: an ACoS above that loses money. Break-even CPA (cost per acquisition, or cost per order from ads) is $14.50, the most you can pay in ads to get one order and still break even. CPA is often easier to watch day to day on Meta or Google, where the platform reports cost per purchase.
How do shipping, fees and returns change break-even ROAS?
Every cost you add lowers your margin before ads and raises break-even ROAS. Here is the same $40 product under different conditions.
| Scenario | Margin before ads | Break-even ROAS |
|---|---|---|
| Gross margin only (wrong) | 70.0% | 1.43 |
| All fees and $6 shipping (base case) | 36.25% | 2.76 |
| Base case + $1.00 returns allowance per order | 33.75% | 2.96 |
| Buyer pays $6 shipping (fees charged on $46) | 42.2% | 2.37 |
| Two-item order: $80, $24 product, $7 shipping | 42.9% | 2.33 |
- Returns: if some orders come back and can't be resold, spread that loss across all orders. One simple way: return rate × (product cost + shipping you lose) as a per-order allowance.
- Buyer-paid shipping: shipping charged to the buyer counts as revenue, and some marketplaces take their percentage on it too. In the example that raises margin to 42.2% and drops break-even to 2.37.
- Bigger orders: a second item adds revenue but only a little shipping and no extra fixed fee, so break-even falls from 2.76 to 2.33. That's why raising average order value makes ads easier to run profitably.
- Discounts: a sale price cuts margin hard. A 20% discount on the $40 product leaves $32 of price but most costs unchanged; recalculate break-even for every promotion (see how to calculate discount percentage).
When ROAS is close to break-even, fresh creative is often the cheapest fix. Turn a product photo into a short UGC-style video ad with an AI creator, captions and a hook-first script.
Make a video ad7 days free · 50 credits · No credit cardHow do I find my target ROAS for profit?
Target ROAS = 1 ÷ (margin before ads − the profit margin you want to keep after ads).
Break-even is the floor, not the goal. If the $40 product has a 36.25% margin before ads and you want to keep 15% of revenue as profit after ads, target ROAS = 1 ÷ (0.3625 − 0.15) = 1 ÷ 0.2125 = 4.71. For a 10% profit target, it's 1 ÷ 0.2625 = 3.81. If your target is as high as your margin before ads, no ROAS can reach it, and the fix is in pricing or costs, not ads. For a full table by margin, see what is a good ROAS.
Common break-even ROAS mistakes
| Mistake | Effect | Fix |
|---|---|---|
| Using gross margin | Break-even looks far too low | Subtract fees, shipping and packing too |
| Ignoring fixed per-order fees | Small orders look more profitable than they are | Add them per order |
| One margin for the whole shop | Thin-margin products hide behind good ones | Work out break-even per product or product group |
| Forgetting discounts | Promotions run below break-even | Recalculate at the sale price |
| Comparing with platform ROAS only | Attribution can overstate results | Also check total sales ÷ total ad spend |
For the cost side, how to calculate profit margin has a full per-unit breakdown, and our free profit margin calculator takes product, shipping, ad and other costs plus percentage and fixed fees. To measure the ROAS you're comparing against, see how to calculate ROAS.
Frequently asked questions
How do you calculate break-even ROAS?
Divide 1 by your profit margin before ad spend, written as a decimal. A product with a 40% margin after product cost, fees and shipping has a break-even ROAS of 1 ÷ 0.40 = 2.5.
What is a break-even ROAS of 2?
A break-even ROAS of 2 means you keep 50% of each sale before advertising, so each $1 of ads must bring $2 in sales to pay for itself. A ROAS above 2 is profitable and below 2 loses money.
Should break-even ROAS include shipping?
Yes. Any shipping and packing you pay is a cost of the order and lowers your margin before ads. If the buyer pays shipping, count it as revenue and still count your label cost.
What is the difference between break-even ROAS and target ROAS?
Break-even ROAS is where ads leave zero profit: 1 ÷ margin. Target ROAS adds the profit you want: 1 ÷ (margin − target profit margin). Target ROAS is always higher than break-even.
How do I calculate break-even ACoS?
Break-even ACoS equals your profit margin before ad spend. If you keep 30% of each sale before ads, an ACoS of 30% breaks even, and lower is profitable.
Why is my break-even ROAS so high?
Usually because the margin before ads is thin, often from high shipping, marketplace fees or a low price. Raising order value with bundles, cutting shipping cost or raising price lowers it more than ad tweaks can.
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