Auction & Deal Calculators
Free, practical tools for bidding smart and buying well — set a maximum bid, add up premiums and fees, map the bid ladder, test a discount, estimate the total cost to win, and check a resale flip before you commit.
Maximum Bid Calculator
Set your walk-away number before the auction. Work backward from your all-in ceiling through the buyer's premium, tax, and shipping to the highest hammer bid you should place.
Auction Fee & Buyer's Premium Calculator
Turn a hammer price into what you actually pay — add the buyer's premium, flat lot fees, and sales tax to see the true total and the effective markup over the winning bid.
Bid Increment & Proxy Bid Table
See the minimum bid increment at any price and the full proxy-bid ladder from the current bid up to your maximum — exactly how automatic bidding climbs, step by step.
Deal Savings & Discount Calculator
Get the real discount and amount saved, a per-unit price for multi-packs, and a check against the typical market price to tell a genuine deal from an inflated 'was' price.
Total Cost-to-Win Estimator
Add hammer price, premium, tax, shipping, insurance, and handling for the true landed cost of a lot — plus the cost per item on a multi-item or box lot.
Resale Profit & Margin Estimator
Weigh your all-in cost basis against net proceeds after selling-platform fees and shipping to get profit, margin, ROI, and the break-even sale price of a flip.
Bid Ladder Reference
See the whole ladder at once: increment, buyer's fees, shipping, true total cost, and break-even resale price at eight representative hammer prices, computed from the same calculators.