The 4 shipping cost blocks to include every time
- Postage by parcel size and shipping option
- Packaging material (box, fillers, label)
- Handling time per shipment
- Risk buffer for returns and exceptions
Fast calculation logic per listing
- Set target selling price
- Subtract platform and payment fees
- Subtract real shipping and packaging cost
- Subtract sourcing cost and validate minimum margin
Where sellers most often miscalculate
- Using standard postage although item requires larger parcel class
- Underestimating or skipping packaging costs
- Treating returns as random instead of planned risk