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Calcimator

Auctioneer Commission Calculator

Net proceeds from auction after commission and fees.

Inputs

%
%
%

Results

Seller Net Proceeds ($)

$4,175.00

≈ 4 smartphones

Total Buyer Pays ($)

$6,000.00

≈ 6 smartphones

Seller Commission ($)$750.00
Buyer's Premium ($)$1,000.00
Total Lot Fees ($)$25.00
Auction House Revenue ($)$1,775.00
Effective Seller Cost (%)16.5
How to Use This Calculator
  1. Enter the hammer (final bid) price and the seller commission percentage (typically 10-25%).
  2. Input the buyer's premium percentage (typically 15-25%), per-lot fee, and number of lots.
  3. Set the insurance percentage if applicable.
  4. Review seller net proceeds and the total the buyer pays (hammer + buyer's premium).
  5. Check auction house revenue to understand total fees generated from the transaction.

How the result changes with Hammer Price ($)

Hammer Price ($)Seller Net Proceeds ($)Total Buyer Pays ($)
10,000,000$8,399,975.00$12,000,000.00
35,000,000$29,399,975.00$42,000,000.00
65,000,000$54,599,975.00$78,000,000.00
90,000,000$75,599,975.00$108,000,000.00

What each input means

Hammer Price ($)
Final bid (hammer) price of the item.
Seller Commission (%)
Commission charged to the seller. Typical: 10-25%.
Buyer's Premium (%)
Additional charge to the buyer. Typical: 15-25%.
Lot Fee ($)
Per-lot handling, photography, and catalog fee.
Number of Lots
Number of lots consigned.
Insurance (%)
Insurance as percentage of hammer price.

What each result means

Seller Net Proceeds ($)
What the seller takes home after all deductions.
Seller Commission ($)
Commission deducted from seller.
Buyer's Premium ($)
Premium added to buyer's total.
Total Buyer Pays ($)
Hammer price + buyer's premium.
Total Lot Fees ($)
All lot-related fees.
Auction House Revenue ($)
Total revenue for the auction house.
Effective Seller Cost (%)
Total cost to seller as percentage of hammer price.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Hammer Price ($) = 5000, Seller Commission (%) = 15, Buyer's Premium (%) = 20, Lot Fee ($) = 25 = 6 input(s) provided
  2. Calculate Seller Net Proceeds
    Seller Net Proceeds = hammerPrice - sellerCommission - totalLotFees - insuranceCost
    4175 = $4,175
  3. Calculate Total Buyer Pays
    Total Buyer Pays = hammerPrice + buyersPremium
    6000 = $6,000
  4. Calculate Seller Commission
    Seller Commission = hammerPrice * (sellerCommissionPct / 100)
    750 = $750
  5. Calculate Buyer's Premium
    Buyer's Premium = hammerPrice * (buyersPremiumPct / 100)
    1000 = $1,000

Engine last updated . Checked against 1 independently-derived test — how we verify calculators.

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