Calculator
Free resale profit calculator
Enter the actual or planned figures below. The calculator makes no assumptions about marketplace fees: enter the selling costs that apply to your transaction.
Profit£30.00
ROI on total investment150.0%
Profit margin60.0%
Use realised costs for realised profit
A forecast is useful before buying, but the final result should use the real purchase, sale and cost figures. Keep cleaning, repair and packaging separate so you can see where margin was lost.
ROI and margin are not the same
ROI compares profit with the money invested. Profit margin compares profit with sale proceeds. Using both gives a clearer picture than a single percentage.
Keep marketplace-specific fees as an input
Fees and selling policies can change. This calculator deliberately does not hard-code a marketplace fee rate. Enter the actual fee shown for the transaction or the fee you genuinely expect.