Bid-ceiling calculator

Enter the price you are working back from and what you need to clear. The result is arithmetic on your own inputs, nothing more: it is not a valuation or advice. Nothing you type leaves your browser.

The formula

max bid = reference × (1 − margin) − shipping − fees
fees = reference × fee rate

The reference price is yours to choose: a market price, a lowest listing, or whatever you expect to sell for. Card pages link here with a market price pre-filled, and label where it came from.