Salesfire Summit 2026: Do you know which orders lost you money this week?

Revenue is not profit. The orders quietly losing you money rarely show up until the numbers are run. Set the contribution margin you need, and the calculator works back through what a Shopify order really costs you. It returns the most you can afford to spend winning a customer, and the ROAS that demands.

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Shopify brands choose Herd for growth

Your ROAS target is only as good as your margin data

Reported ROAS looks healthy. Revenue climbs. But the bank balance doesn't move.

That's because the target itself was built on incomplete numbers. Cost of goods, discounts, platform and payment fees, fulfilment and returns all come out of the same order before advertising gets its share. Whatever survives is your acquisition budget.

Work it backwards and the constraint becomes obvious: a 30% contribution margin on a £50 order can leave under £3 to win a customer - which needs a 20x ROAS. If your media can't reach that, either the target is wrong, or the cost base is.

Margin Guard folds all of that into your ROAS target automatically. Calculate your true acquisition budget.

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Does your profit work?

Target cont. margin30%

Sales revenue (inc. delivery income)£50

COGS£20

Discounts (e.g. product or welcome offer)£5

Platform/payment fees (e.g. Shopify)£1

Fulfilment & returns£6.5

Monthly media spend£20000

Agency management fee£2000

This is the same logic Margin Guard runs on every order, automatically - flagging the ones losing you money the moment they're paid. Use the calculator to see where your own target should sit.