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Margin & ROAS calculator

The maths you redo by hand for every new product: what you actually keep once the supplier, shipping, Shopify and advertising are paid — and the ROAS below which you lose money.

What you collect

%

What it costs you

Packaging, support, subscriptions spread per order…

Transaction fees

%

Pre-filled with a common ballpark for a European card — replace it with your actual contract rate.

Target

%
To find the selling price you should charge.

What you keep

The maths behind it

Frequently asked questions

Why compute margin excluding tax?

Because the VAT you collect is not yours: you hand it over. Working in tax-inclusive figures inflates your margin by roughly 20% and it is the most common mistake in e-commerce.

What is break-even ROAS?

The revenue-to-ad-spend ratio below which you work at a loss. If your break-even is 2.5 and your campaigns run at 2, every euro you spend makes you poorer — even with revenue going up.

Is my data sent anywhere?

No. Everything is computed in your browser, nothing reaches our servers and nothing is stored.

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Charging more starts with a page that justifies it

Story Theme is built for branding: a store that inspires confidence supports a higher average order value, and that is your margin breathing.

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