Break-even ROAS is the return on ad spend where you neither make nor lose money on an order. The formula is: Break-even ROAS = Average selling price ÷ Contribution margin per order. Contribution margin is what remains after product cost, shipping, marketplace or payment fees, and a return reserve. Any ROAS above the break-even number produces profit; anything below burns cash — even when reports show a positive return.
This guide walks through the formula step by step, shows a USD worked example, explains why platform-reported ROAS often overstates true incremental ROAS, and links to a free calculator so you can plug in your own numbers.
Why break-even ROAS matters more than target ROAS
Most sellers pick a target ROAS from a benchmark blog or an agency pitch. That is the wrong starting point. Your target ROAS is meaningless unless you know your break-even ROAS, because the difference between the two is the only profit that pays for your team, your rent, and yourself.
A store with a 35% contribution margin breaks even at a 2.86x ROAS. A store with a 15% margin breaks even at 6.67x. The same 4x ROAS is comfortable in the first store and catastrophic in the second.
The formula in one line
Break-even ROAS = Average selling price ÷ Contribution margin per order
Where contribution margin per order = Price − COGS − Shipping absorbed − Payment/marketplace fees − Return reserve.
Step by step
- Start with your average selling price or AOV. For a Shopify store, that is your 30-day AOV; for FBA, your average unit price.
- Subtract product cost (COGS). Include landed cost — freight, duty, and inbound shipping to your warehouse or FBA.
- Subtract the shipping you absorb. If you charge shipping to the customer, only subtract the portion you actually pay above what they cover.
- Subtract marketplace and payment fees. For Shopify Payments, this is roughly 2.9% + $0.30. For Amazon FBA, it is the referral fee plus fulfillment fee. Use current rates from your seller dashboard.
- Subtract a return reserve. A 5–10% reserve is common; higher for apparel and beauty.
- Divide price by the remaining contribution margin. That is your break-even ROAS.
Where sellers get this wrong
- Using gross margin (price minus COGS only) instead of contribution margin. Ads that break even on gross margin still lose money after shipping and fees.
- Forgetting that platform-reported ROAS often includes view-through conversions. Blended ROAS from total revenue over total ad spend is closer to reality.
- Setting one break-even ROAS across a whole catalog. Break-even varies by product because COGS varies. Track by SKU or price band.
- Ignoring seasonality. Q4 CPMs rise; your effective ROAS drops even if targeting is unchanged.
Use the free calculator
Plug your inputs into the Break-Even ROAS Calculator for an immediate estimate. It also shows a suggested target ROAS with a 15% profit buffer.
Example calculation (USD)
Worked example — mid-price DTC skincare brand
| Line | Value |
|---|---|
| AOV | $62.00 |
| COGS | $14.00 |
| Shipping absorbed | $5.50 |
| Payment fee (2.9% + $0.30) | $2.10 |
| Return reserve (7%) | $4.34 |
| Contribution margin | $36.06 |
| Break-even ROAS = $62.00 ÷ $36.06 | ≈ 1.72x |
| Target ROAS with 15% profit buffer | ≈ 1.98x |
If Meta Ads Manager reports a 3.0x ROAS and your blended ROAS is 2.1x, this business is still profitable — but only just, and only for as long as fees and CPMs stay flat.
Common mistakes to avoid
- Confusing ROAS with profit.
- Using only COGS instead of full contribution margin.
- Trusting last-click ROAS as truth.
- Not updating fees when marketplaces change their rate cards.
- Setting a single target ROAS across all price points.
Best practices
- Recalculate break-even ROAS quarterly, or after any pricing/COGS change.
- Report blended ROAS alongside channel-reported ROAS in every weekly review.
- Set target ROAS at 1.15–1.5× break-even, not a benchmark number.
- Segment by product tier — cheap SKUs often need much higher ROAS than premium ones.
Frequently asked questions
Is break-even ROAS the same across platforms?
No. Payment and platform fees differ between Shopify, Amazon, Etsy, eBay, TikTok Shop, and Walmart, so break-even ROAS differs even for the same product.
How does incrementality change break-even?
If only 60% of your reported ad conversions are truly incremental, your effective ROAS is 60% of reported. Divide reported ROAS by your incrementality factor before comparing to break-even.
Should I include fixed costs?
No — those belong in your target ROAS margin. Break-even ROAS only covers variable costs per order.
Where does return rate come from?
Use your rolling 90-day return rate, not the number your platform reports for last week. Apparel and beauty often run 15–30%.