The math, before you raise the paddle.
Four free tools we built for ourselves first: the same calculations baked into AuctionIQ, broken out as standalone calculators you can use without an account.
- I
Buyer's premium calculator
Add the buyer's premium and tax to a hammer price to see what you really pay. Defaults for the major auction houses included.
Open the calculator → - II
Auction profit calculator
Enter acquisition costs and expected resale. Every fee on both sides is folded in, so you see actual margin and ROI before you bid.
Open the calculator → - III
Max bid calculator
Work backward from a target sale price and margin. The tool returns the highest hammer price you should ever bid past.
Open the calculator → - IV
Fees directory
Reference rates for 99+ resale marketplaces and major auction houses, kept current. Search and compare in one place.
Browse the directory →
Real comp data, on every lot you watch.
AuctionIQ pulls live sold-comp data from auction records and resale marketplaces so you can value items before you bid, not after you’ve overpaid.
Try AuctionIQ free →Free to start. No credit card.