A 4× return can be excellent. Or a straight loss.
It depends on your purchase price, shipping, fees, returns and on the value you send to the ad platform. Work out your own break-even point.
- Result without an email
- Tax and tax-free modes
- CZK, EUR and USD
- Cost of goods−55.4 %
- Logistics−7.7 %
- Marketing−18.2 %
- Operations−10.4 %
- Left over8.3 %
How much an order may cost.
Enter the economics of one order and the value you report to the ad platform. You'll see the point below which you're selling at a loss.
Currency changes only the unit and number format. Your entered values are never converted.
The amount you actually charged for the goods.
What the items in this order cost you.
What it costs you on average to win one order.
The same average conversion value your ad platform uses to calculate return. It usually includes tax and shipping, so it differs from revenue — that's why it has its own field.
Enter your numbers on the left.
The result appears as soon as you fill the first field. Nothing is sent anywhere — the maths runs in your browser.
Same order. Completely different picture.
An ordinary calculator stops at the difference between selling and purchase price. Here we go further — to the amount you can actually spend on running and growing the business.
Gross margin
- Revenue excl. taxCan't be calculated
- Cost of goodsCan't be calculated
- Gross profitCan't be calculated
Contribution after costs
- Gross profitCan't be calculated
- Shipping, fees and returnsCan't be calculated
- AdvertisingCan't be calculated
- Left for advertisingCan't be calculated
Fill in the calculator above and both cards recalculate on your numbers.
What ROAS do you need in order not to lose money?
Return on ad spend on its own says nothing about profit. What decides it is how much of the order was left before you paid for advertising. At a 40% contribution the break-even point sits somewhere entirely different than at 15% — and that's the whole difference between a great result and selling at a loss.
What does a worked example look like?
On a 1,490 order including 21% tax you're left with 497.66 before advertising. The ad platform reports a conversion value of 1,490, so the break-even point is 2.99×. If it reported revenue excluding tax — 1,231.40 — the point would be 2.47×. That's why the reported value is a separate field: miss the difference and you set your threshold 17% too low, which is exactly the tax factor.
How does tax enter the calculation?
Before anything is added up, every amount is converted to one economic basis. If you're registered for tax, output tax comes off revenue and input tax comes off costs, because you can reclaim it. The payment fee isn't converted — financial services are exempt, so there's nothing to reclaim. The country preset is only a suggestion; what you set is what counts.
- Highest cost per order
- contribution before ads
- Break-even return
- value reported to the ad platform ÷ contribution before ads
- For a target margin
- value reported to the ad platform ÷ (contribution before ads − target margin × revenue)
Counting a return twice
The refunded amount reduces revenue. Return shipping and the work involved are an extra cost. Put both in one field and the result looks worse than it is.
Advertising folded into the margin
You can't derive a break-even point from a margin that already has advertising deducted — it's circular and the number means nothing. That's why we start from the contribution before advertising.
Mixing prices with and without tax
Revenue including tax minus a purchase price excluding tax gives you a margin that doesn't exist anywhere. So the calculator converts everything to one basis first.
You might recognise one of these.
Your ad platform reports a 4× return and you don't know whether that's enough.
Your break-even point comes from your cost of goods and your costs, not an industry average.
You're deciding whether to switch a campaign off or put more into it.
See how much an order may cost before the campaign slips into a loss.
Revenue in your ad account never matches revenue in your books.
Conversion value is a separate field — precisely because it's usually tax-inclusive and before returns.
You worked out one order. Margly does it for all of them.
You worked out the point for one order. Margly works it out for every campaign and shows which ones earn and which don't.
- 1Pick your platformShoptet, Upgates, Shopify or WooCommerce.
- 2Let it load real dataOrders, products and purchase prices come in on their own.
- 3Fix the biggest impact firstA specific opportunity, an amount and a recommended step.
14 days free · no card required · data in the EU
- Do todayMove budget out of three campaigns below break-even.Sample
- ProductsRaise visibility of a product with above-average margin.Sample
- ShippingA carrier whose shipping balance doesn't add up.Sample
Frequently asked questions
Do I have to sign up to see the result?
Does Margly calculate the same way inside the app?
Why isn't advertising deducted twice?
Why is the value reported to the ad platform a separate field?
What does it mean when there's no finite break-even point?
More tools
Profit margin calculator
Go from basic margin and markup to profit after fulfilment, fees, returns and advertising. Calculate one order manually — then let Margly run the same logic across your entire store.
Open tool →Net margin calculator
Build a simple income statement from revenue through goods, logistics and marketing all the way to operating and net profit.
Open tool →Product profitability
Some products drive turnover but leave almost nothing after discounts, logistics, returns and advertising. Margly finds them automatically.
Open tool →Let Margly calculate your whole store.
Orders, products, purchase prices, advertising and operating costs in one view. On your data, not on a generic benchmark.
Connect your ads and see profit per campaign14 days free · no card required · data in the EU