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Calcimator

Auction Commission Calculator

Calculate net proceeds from auction sales after buyer's premium, seller's commission, lot fees, and insurance.

Inputs

%
%
%

Results

Net to seller ($)

$880.00

≈ 7 pairs of sneakers

Buyer total ($)$1,200.00
Total seller fees ($)$120.00
Effective fee rate (%)12%
Auction house total ($)$320.00
Private sale estimate ($)$850.00
Auction House (%) Of Transaction26.67%
Private Sale Advantage-30
How to Use This Calculator
  1. Enter the hammer price (winning bid) and seller commission percentage.
  2. Set buyer's premium (%), number of lots, lot fee, and insurance percentage.
  3. Review Net to Seller, Buyer Total, Total Seller Fees, and Effective Seller Fee Rate (%).
  4. Compare net-to-seller across multiple auction houses before consigning valuable pieces.

How the result changes with Hammer price ($)

Hammer price ($)Net to seller ($)
10,000,000$8,899,990.00
35,000,000$31,149,990.00
65,000,000$57,849,990.00
90,000,000$80,099,990.00

What each input means

Hammer price ($)
The winning bid (hammer price) at auction.
Seller commission (%)
Commission percentage charged to the seller.
Buyer's premium (%)
Premium percentage charged to the buyer on top of hammer price.
Number of lots
Number of lots being consigned.
Lot fee ($)
Fixed fee per lot (photography, cataloging, etc.).
Insurance (%)
Insurance percentage of hammer price.

What each result means

Net to seller ($)
Amount the seller actually receives after all deductions.
Buyer total ($)
Total amount the buyer pays including buyer's premium.
Total seller fees ($)
All fees deducted from the seller's proceeds.
Effective fee rate (%)
Total seller fees as a percentage of hammer price.
Auction house total ($)
Total revenue the auction house earns from both sides.
Private sale estimate ($)
Estimated proceeds from private sale (~85% of auction hammer, no fees).

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Hammer price ($) = 1000, Seller commission (%) = 10, Buyer's premium (%) = 20, Number of lots = 1 = 6 input(s) provided
  2. Calculate Net to seller
    Net to seller = hammerPrice - totalSellerDeductions
    880 = $880
  3. Calculate Buyer total
    Buyer total = hammerPrice + buyersPremium
    1200 = $1,200
  4. Calculate Total seller fees
    Total seller fees = sellerCommission + totalLotFees + insuranceCost
    120 = $120

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