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Ad spend per order is the metric, not ROAS

AdsMargins·4 min read·Updated 20 July 2026

Ad dashboards report return on ad spend against orders placed. Your bank account cares about orders delivered and kept. On a marketplace with a meaningful return tail, those two numbers are far apart, and optimising the first can quietly destroy the second.

The problem with ROAS

A 4x ROAS looks healthy. But if a fifth of those orders come back, the campaign generated revenue you have to return while keeping the ad cost that produced it. Refunds do not refund advertising.

Worse, ad platforms optimise for conversions, and the easiest conversions to buy are often:

  • impulse buyers, who refuse more often at the door
  • COD-heavy audiences, where RTO is structurally higher
  • price-sensitive shoppers, who return more after comparing

So the campaign that reports the best ROAS can be the one importing your worst RTO rate.

Use cost per delivered order

ad cost per delivered order = total ad spend / orders DELIVERED AND KEPT

  20,000 spend / 100 orders placed          = 200   what the dashboard says
  20,000 spend / 79 delivered and kept      = 253   what it actually cost you

That is a 27% understatement, before anyone has argued about attribution windows. If your margin per order is thinner than that gap, a campaign can look profitable in the dashboard and lose money in reality.

Know your ceiling before you scale

There is an ad spend per order above which the product stops making money. Work it out before scaling, not after. Once you know the ceiling, campaign decisions become arithmetic rather than instinct: anything under it can scale, anything over it needs the product economics fixed first.

The ceiling moves with your return and RTO rates. A campaign that was viable at 9% returns may not be at 15%, without a single thing changing in the campaign itself.

Before you cut spend

When a product is losing money, ads look like the obvious thing to cut, and sometimes they are. But check the delivery rate first. If RTO is the cause, cutting ads reduces volume without fixing the leak — you will lose money more slowly on fewer orders, which is not the same as fixing it.

The profit calculator charges ad spend against every order placed, not just the delivered ones, so the figure it shows is the one that matches your settlement.

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