Online Auction Calculator

Know the real cost before you bid. Calculate buyer’s premium, tax, fees, and shipping. Unlock foreign auctions with live exchange rates and tariff estimates.

Know your real auction cost before you bid. Auction Calculator is a fast, simple tool that shows the true cost of winning an auction — before buyer’s premium, tax, shipping, and card fees turn a good deal into a bad one. Domestic U.S. Auctions • Buyer’s premium calculations • Sales tax estimates • Shipping & handling • Credit card / PayPal fees Foreign & International Auctions (One-time $3.99 unlock) • Real-time foreign exchange rates • Automatic USD conversion • Import tariff estimates • Avoid surprise fees from FedEx, DHL, and UPS • Supports EUR, GBP, JPY, CAD, AUD, CHF, and more Designed for collectors who bid seriously — coins, antiques, art, and collectibles — and want clear numbers without subscriptions or ads. No advertising. No tracking. No subscriptions. One app. One purchase. Total transparency.