Understand the numbers behind a flip.
Short, practical explanations for the calculations used across ResellTools UK.
ROI
Profit divided by purchase cost. Useful for comparing how efficiently different flips use your money.
Use ROI calculator →Profit margin
Profit divided by selling price. Useful for understanding how much of each sale is actually profit.
Use margin calculator →Break-even price
The sale price where income exactly covers the costs entered, leaving zero profit and zero loss.
Use break-even calculator →A simple reseller checklist
- Know the item's true purchase cost.
- Add seller-paid postage, packaging, cleaning and promotion costs.
- Estimate realistic sale price rather than the highest listing you can find.
- Check break-even price and target profit before buying stock.
- Recalculate when a buyer sends an offer.