Auction Price vs Market Value Calculator
Find out whether an auction lot is really a bargain. Add buyer’s premium, VAT and extra costs to the hammer price, compare the true cost with market value and work out your maximum bid.
Compare Auction vs Market Value
Enter the lot’s market value and your expected hammer price, then add the fees and costs you will face. The calculator shows your real saving and the highest bid that still meets your target.
Auction Bid Calculator
Works for cars, property, art, antiques, equipment and more.
Understanding the Numbers
Why the hammer price is not the price you pay
Start With a Fair Market Value
Use sold prices, not asking prices. A cautious value protects you from paying for a saving that isn’t there.
Add the Buyer’s Premium
The premium is charged on top of your winning bid, and VAT may apply to it. Check the terms in the auction catalogue.
Include Every Extra Cost
Repairs, delivery, storage, insurance and payment fees all reduce your saving. Lots sold as seen can need more work than expected.
Bid to a Target
Pick the discount you need to make the lot worthwhile. The max bid shown is the hammer price at which you just reach that target.
Costs on Top of the Hammer Price
The charges that commonly sit between your winning bid and your true cost. Exact rules vary by auction house and item type.
| Cost | When It Applies | What to Check | How to Plan for It |
|---|---|---|---|
| Buyer’s premium | Added to the hammer price | Percentage and any minimum charge | Enter the rate in the calculator |
| VAT on premium | Where the auction house charges it | Whether VAT applies to premium or to the item | Set the VAT field to match the terms |
| Repairs | Items sold as seen or untested | Condition reports and viewing day findings | Add a buffer above your best estimate |
| Transport & storage | Collection deadlines and delivery | Collection window and storage charges | Get a delivery quote before bidding |
| Payment fees | Card or online bidding platform fees | Accepted payment methods and surcharges | Include them in transport and other fees |
| Resale costs | If you plan to sell the item on | Listing, commission and shipping costs | Enter a resale percentage for realistic profit |
Auction Price vs Market Value FAQ
Answers to common questions about auction pricing, fees and bidding limits.
Enter the estimated market value, the hammer price, the buyer’s premium and any VAT on that premium, plus repair, transport and other costs. The calculator adds everything to give your true all-in cost, compares it with market value, and shows your saving or overpayment. It also works out the highest hammer price you can bid to reach a target discount.
The hammer price is the winning bid when the auctioneer closes the sale. It is not the final amount you pay, because buyer’s premium, VAT and other charges are usually added on top.
A buyer’s premium is a percentage of the hammer price that the auction house charges the winning bidder. In some places VAT is also charged on the premium. Always check the auction’s terms and conditions for the exact rate.
Decide the discount to market value you want, subtract your extra costs from the target all-in price, then divide by one plus the buyer’s premium including any VAT on it. The calculator does this for you and shows the highest hammer price to bid.
Look at recent sold prices for the same item in the same condition, such as completed listings, dealer prices and past auction results. Use a cautious figure, because asking prices are often higher than the price an item actually sells for.