---
title: "Break-even ROAS: set target ROAS from your margin"
author: "Performetic Ekibi"
url: "https://www.performetic.com/en/blog/break-even-roas-calculator-target-roas"
published: "2026-09-20T08:00:00.000Z"
updated: "2026-10-05T00:36:35.264Z"
---

# Break-even ROAS: set target ROAS from your margin

> Break-even ROAS is the ROAS at which ads neither make nor lose money, calculated as 1 / contribution margin. Contribution margin is what remains after product cost, shipping, payment fees, packaging and expected return costs. At a 40% contribution margin, break-even ROAS is 2.5. Your target ROAS is that number plus the profit you want to keep.

## What is break-even ROAS?

Break-even ROAS is the point where your ad spend uses up exactly the contribution you earn from the first order, so you neither make nor lose money. The formula is: break-even ROAS = 1 / contribution margin. With a 40% contribution margin, break-even ROAS is 1 / 0.40 = 2.5. Any campaign running below that loses money on the first purchase.

Plenty of ecommerce brands set their ROAS target based on what competitors claim or what an agency once said. The right target comes from your own cost structure, and it can be worked out with simple arithmetic. This guide walks through it step by step.

## How do you calculate contribution margin?

Break-even ROAS is only as accurate as the contribution margin behind it. The most common mistake is to subtract product cost only and use gross margin. You need every cost that scales with each order:

- **Product cost:** purchase or manufacturing cost.
- **Shipping:** outbound delivery cost (all of it, if you offer free shipping).
- **Payment fees:** card processing or payment gateway fees, plus instalment charges where relevant.
- **Packaging:** boxes, fillers, inserts.
- **Expected return cost:** return rate multiplied by the loss per return (return shipping, handling, unsellable stock).

Fixed costs such as rent, salaries and software subscriptions stay out of contribution margin. They are covered by total contribution.

### Example: contribution margin for one product

Example: a product sells for $120 including 20% VAT, so the net price is $100.

1. Net selling price: $100
2. Subtract product cost of $45, leaving $55
3. Subtract shipping of $6, leaving $49
4. Subtract payment fees (example 3% of the gross $120, so $3.60), leaving $45.40
5. Subtract packaging of $1.40, leaving $44
6. Subtract expected return cost (example 10% return rate, $40 loss per return, so $4), leaving $40

Contribution = $40, contribution margin = 40 / 100 = 40%. Break-even ROAS = 1 / 0.40 = 2.5.

Had you subtracted product cost only, you would have calculated a 55% gross margin and a break-even ROAS of 1.82. Every campaign between 1.82 and 2.5 would have looked profitable while actually losing money.

## Break-even ROAS by margin

The table shows break-even ROAS for common contribution margins, both as a ratio and in the percentage format Google Ads uses.

| Contribution margin | Break-even ROAS (ratio) | Google Ads format | Break-even revenue per $1,000 spend |
|---|---|---|---|
| 20% | 5.00 | 500% | $5,000 |
| 30% | 3.33 | 333% | $3,333 |
| 40% | 2.50 | 250% | $2,500 |
| 50% | 2.00 | 200% | $2,000 |
| 60% | 1.67 | 167% | $1,667 |

Revenue figures in the table are net of VAT. If your pixel sends values including 20% VAT, the break-even ROAS you will see in the platform is multiplied by 1.2: at a 40% margin, 3.0 instead of 2.5.

## How do you set a target ROAS?

Break-even is a floor, not a goal. Decide how much profit you want left after ad spend and use:

**Target ROAS = 1 / (contribution margin - desired profit margin)**

Example: contribution margin is 40% and you want 10% of revenue left after ads. Target ROAS = 1 / (0.40 - 0.10) = 3.33. Check: from $100 of revenue, $40 is contribution, $30 goes to ads, $10 is yours.

Two trade-offs matter when you set it:

- **Volume versus efficiency:** raising target ROAS usually reduces volume, because the algorithm only enters the auctions it is most confident about.
- **Customer lifetime value:** if repeat purchase is strong, acquisition campaigns can run near or even slightly below break-even. Base that call on your own cohort data, not on hope.

## How do you enter target ROAS in Google Ads and Meta?

### Google Ads

Google Ads target ROAS (tROAS) bidding works on conversion value relative to spend and takes the target as a percentage. A target of 3.33 is entered as 333%. It only works well if conversion values are accurate and consistent.

If you want to move toward profit, Google Ads conversions with cart data lets you add product costs in Merchant Center and report gross profit, so campaigns can be evaluated on profit rather than revenue.

### Meta

Meta's ROAS goal bid strategy aims to keep delivery around the ROAS level you set. Treat your break-even number as the floor: setting a goal below it means buying scale with unprofitable orders. Meta's ROAS also depends on the value your pixel sends, so the same VAT and returns adjustments apply.

### What to watch when you change targets

1. Check your actual ROAS over the last 30 days.
2. Start the target close to that number; a sudden jump can stall delivery.
3. Change targets in small steps and leave time for the algorithm to adjust between changes.
4. After each change, watch both platform ROAS and total revenue in your store backend.

## What if margins differ by product?

A single account-level average hides the difference between products. If a 60% margin accessory and a 20% margin electronics item compete in the same campaign with the same target, the algorithm may favour the electronics item purely on revenue. The fix is to group products by margin. In Google, use Merchant Center custom labels (custom_label) to tag products as high, medium or low margin and run them with separate target ROAS values. In Meta, product sets in your catalogue allow a similar split.

At Performetic, the first thing we do on a new account is build a product-level contribution margin table with the brand, and every target ROAS comes from that table. You can read more on our [performance marketing service page](/en/services/performance-marketing).

## Key takeaways

- Break-even ROAS = 1 / contribution margin.
- Always include shipping, payment fees, packaging and expected returns in contribution margin.
- Target ROAS = 1 / (contribution margin - desired profit margin).
- Google Ads takes target ROAS as a percentage: a 2.5 target is entered as 250%.
- If you send values including VAT, multiply your targets by 1.2.
- Split products with different margins into separate groups with separate targets.

## FAQ

### What is the break-even ROAS formula?

Break-even ROAS = 1 / contribution margin. Contribution margin is the share of the net selling price left after product cost, shipping, payment fees, packaging and expected return costs. At a 25% contribution margin, break-even ROAS is 4, and any campaign below that loses money on the first order.

### Should target ROAS equal break-even ROAS?

No. Break-even ROAS is the floor where ads make neither profit nor loss. Target ROAS adds the profit you want on top: 1 / (contribution margin - desired profit margin). Brands with strong repeat purchase can deliberately accept targets near break-even for acquisition campaigns, based on their cohort data.

### How do I enter target ROAS in Google Ads?

Google Ads takes target ROAS as a percentage, so multiply your ratio by 100: a 2.5 target becomes 250% and 3.33 becomes 333%. Starting close to your actual ROAS and changing it in small steps prevents sudden drops in delivery. Make sure conversion values are being sent accurately before relying on it.

### How do returns affect break-even ROAS?

Multiply your return rate by the average loss per return and add the result to the cost of every order. With a 10% return rate and a $40 loss per return, expected return cost is $4 per order. That lowers contribution margin and raises break-even ROAS, which is why high-return categories need higher targets.

## Sources

- [About Target ROAS bidding (Google Ads Help)](https://support.google.com/google-ads/answer/6268637)
- [About conversions with cart data (Google Ads Help)](https://support.google.com/google-ads/answer/9028254)
- [About Meta bid strategies (Meta Business Help Center)](https://www.facebook.com/business/help/1619591734742116)
- [How to Increase Profit Margin (Shopify)](https://www.shopify.com/blog/profit-margin)