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Auction Calculators

Honest, adjustable math for the auction business: what cataloging really costs, what bidders really pay, and what consignors really net. Every assumption is a slider — no black boxes.

For auctioneers & estate sale companies

Cataloging ROI Calculator

Manual cataloging labor vs AI — with review time included. The default edit rate uses Gavelist's measured figure: 88.2% of lots shipped with no client edit (all clients except the largest, through Sep 2026).

For bidders

Buyer's Premium Calculator

Hammer price + premium + tax = what you actually pay. Includes a reverse mode that turns your budget into a maximum bid.

For consignors & auctioneers

Consignment Payout Calculator

Commission, fees, and your true net — with the house's side of the economics shown too, so everyone negotiates from the same math.