Break-Even ROAS Calculator: Formula With Shipping, Fees and Returns

What is break-even ROAS, and why is 1 ÷ margin not enough?

Break-even ROAS is the return on ad spend at which advertising cost wipes out the profit on an order exactly; below it, every ad-driven sale loses money. The formula you see everywhere, break-even ROAS = 1 ÷ profit margin, is the right idea, but most people feed it a margin that leaves out real costs.

The issue is what the ad platform counts as revenue. The conversion value behind your ROAS is usually the order or basket total. It does not subtract the card processing fee, the shipping label you pay for on a "free shipping" order, the marketplace commission, or the orders that come back two weeks later. In the UK and EU it may also include VAT that you pass on to the tax authority. If you need a refresher on reading ROAS itself, see our guide to ROAS; this article is only about finding the threshold with your real costs.

What is the break-even ROAS formula?

Work out the contribution profit on one order before ad spend, then divide the value the ad platform records for that order by that profit. Build it in five steps:

1. Platform value (P) The order value sent to Google Ads or Meta as the conversion value. In the US this is often the pre-tax subtotal; in the UK and EU, where shelf prices include VAT, it is often the VAT-inclusive price.
2. Net revenue (N) Revenue after removing any VAT or sales tax included in P. If P already excludes tax, N = P.
3. Product profit N minus landed product cost (C). A returned order loses this profit, so multiply by (1 − return rate r).
4. Variable costs Payment or marketplace fees, outbound shipping and packaging (S), plus return shipping on the share of orders that come back.
5. Break-even ROAS P ÷ contribution profit.

In one line: Contribution = (1 − r) × (N − C) − fees − S − r × return shipping, and Break-even ROAS = P ÷ Contribution. This assumes returned items go back into sellable stock and that payment fees are not refunded on returns; if your processor refunds them, multiply the fee term by (1 − r) as well. Put every per-order cost into S: packaging, pick-and-pack labour, free-shipping subsidies. Leave out fixed costs such as rent, salaries and software subscriptions; they belong in your overall P&L, not in a per-order threshold.

Enter your own numbers in the calculator below to see your threshold straight away.

Worked example: what is the break-even ROAS on an $80 product?

With the assumptions below, break-even ROAS comes out at 2.38, so any ROAS under 2.38 on this product loses money. The figures are illustrative; swap in your own.

• Selling price sent to the platform (P): $80, excluding sales tax, so N = $80
• Landed product cost (C): $30
• Payment processing: 2.9% + 30¢, Stripe's standard US card rate, which is $2.62
• Outbound shipping (S): $8, return shipping: $8
• Return rate (r): 10%

Contribution = 0.9 × (80 − 30) − 2.62 − 8 − 0.1 × 8 = 45 − 2.62 − 8 − 0.80 = $33.58. Break-even ROAS = 80 ÷ 33.58 = 2.38.

That gap is not a rounding error. A store that believes 1.60 is break-even will see a 2.0 ROAS on this product and think it is profitable. In fact every $100 of ad spend brings $200 of platform value, which is 2.5 orders and about $84 of contribution, so the store loses roughly $16 per $100 spent.

How VAT changes the number in the UK and EU

If you sell in the UK, the standard VAT rate is 20% and prices are shown VAT-inclusive, so many stores send the gross price as the conversion value. Say the same product sells for £96 including VAT (N = £80), with the other costs and the same fee structure carried over in pounds for comparison. Contribution drops slightly to about £33.12 because the percentage fee is charged on the higher total, but you now divide the larger number, P = £96, by it: break-even ROAS is 2.90 instead of 2.38. The rule is simple: P in the formula must be defined exactly like the value your pixel or tag sends.

Which costs move break-even ROAS the most?

Marketplace commission, return rate and order value relative to shipping cost. Changing one variable at a time on the $80 example moves the threshold anywhere from 1.92 to 3.64.

Three practical rules follow. First, do not reuse your website ROAS target for products sold through a marketplace: Amazon's referral fee is 15% in many categories, and that alone can push the threshold up by more than a third. Second, in categories with high return rates, track returns per product or product group rather than store-wide. Third, a flat shipping cost eats a much larger share of a cheap order, which is why low-priced products need higher ROAS; raising your free-shipping threshold or bundling products often helps faster than adjusting bids.

What happens to break-even ROAS during a sale?

Discounts cut the price but leave product and shipping costs where they are, so the threshold rises quickly. Sell the $80 product at 15% off ($68) and contribution falls to about $23.13, taking break-even ROAS from 2.38 to 2.94. If you keep your usual targets through Black Friday or Cyber Monday, the platform will report record volume while you earn less on every order, or lose money outright.

What is a good ROAS? How to set target ROAS and max CPA

A good ROAS is your break-even ROAS plus the profit you want to keep on each order. It is not an industry average or a rule-of-thumb 4x. The key figure is contribution profit, because contribution profit is also your break-even CPA: the most you can pay in advertising for one order without losing money.

1. Break-even CPA Contribution = $33.58. Pay more than this per order and you lose money.
2. Target profit Pick the contribution you want left after ads, for example $10 per order.
3. Max CPA 33.58 − 10 = $23.58.
4. Target ROAS 80 ÷ 23.58 ≈ 3.39.

Google Ads expresses target ROAS as a percentage: conversion value ÷ ad spend × 100%. In this example you would open the campaign's bidding settings, choose to focus on conversion value, set a target return on ad spend and enter 339%. For Search and Shopping campaigns, Google's help page lists at least 15 conversions in the past 30 days for target ROAS; with less data, results swing widely. On Meta, pick Maximize value of conversions as the ad set's performance goal and use the ROAS goal bid strategy; Meta takes the goal as a decimal, so you enter 3.39 rather than 339%. To see how rising click costs pressure this threshold, read our breakdown of Google Ads costs in 2026.

What is POAS, and when should you use it instead of ROAS?

POAS (profit on ad spend) is contribution profit from ads divided by ad spend. Above 1 means ads are adding profit; below 1 means they are losing it. ROAS measures revenue, POAS measures what is left.

Using the example product: spend $10,000 at a 3.0 ROAS and the platform reports $30,000 of value. That is 375 orders and 375 × 33.58 ≈ $12,593 of contribution, a POAS of about 1.26 and roughly $2,593 left after ads. At a 2.2 ROAS on the same spend, contribution is about $9,235, POAS is 0.92 and you lose around $765. Both ROAS figures can look healthy on a dashboard.

In practice, bidding on POAS means sending order profit instead of revenue as the conversion value. The trade-off is that platform reports no longer show revenue, and you need to compute profit server-side. That is why most stores start with separate ROAS targets per product group before switching.

Why doesn't platform ROAS show real profitability?

The value the platform divides by spend may not match the value you used for the threshold, and several platforms can claim the same order. Check two things before you trust a target.

Does the value include tax and shipping? Google's GA4 documentation says the purchase event's value should be the sum of price × quantity for the items and should not include shipping or tax. Plenty of stores still send the order total, especially where prices are VAT-inclusive. Whatever you send, define P the same way, or your threshold will be off by up to the tax rate.

Is the same order counted twice? Add up the purchases reported by Google and Meta and the total is often higher than the orders in your store admin. Every channel can look above break-even while the business as a whole loses money. So each week, compare total ad spend with real store orders; we cover the reasons for the gap in why Shopify, Meta and GA4 numbers don't match. Marpany's ad performance view puts Google, Meta and TikTok spend next to actual store orders, so you don't have to reconcile them by hand.

How to put break-even ROAS to work this week

Start with the 5–10 products or product groups that spend the most, calculate their thresholds, then rebuild campaign targets around them.

• Confirm whether the conversion value sent to each ad platform includes tax and shipping.
• List landed cost, average shipping, fee rate and return rate per product group in one sheet.
• Calculate contribution profit, break-even ROAS and break-even CPA for each group.
• Set a target profit per order and derive max CPA and target ROAS.
• Stop running products with very different margins in one campaign under a single ROAS target.
• Once a month, compare ad spend with real order contribution and calculate POAS.

When deciding how to split total spend across channels, use these thresholds alongside our digital ad budget guide. Recalculate whenever costs change, particularly carrier rates, payment fees or marketplace commissions. Fees and rates quoted here are as of September 2026.