Know what stays
after the sale.

Understand your estimate.

How the calculator works

Contribution = selling price − product cost − shipping and fulfilment − platform fee − creator commission − advertising − expected return loss − other variable costs. Percentage fees are applied to the selling price in this simplified model.

What is break-even ROAS?

Break-even return on ad spend equals selling price divided by contribution before advertising. If pre-ad contribution is zero or negative, this model has no positive advertising budget that breaks even.

Contribution is not net profit

This estimate excludes fixed overheads and taxes unless you allocate them in your inputs. Actual platform fee bases, discounts, refunded fees, shipping subsidies and commission attribution can differ. Reconcile results with actual settlement reports. Use a weighted creator commission if only some orders incur commission.

How should I account for returns?

Enter your average expected loss from returns per original order. For example, a 5% return rate with an average loss of £10 per return gives a £0.50 allowance per order. Include only costs not already counted elsewhere.