BTHE BARATELLI INSTITUTE · Mentoring at Scale
FOR AUCTION CHAIRS · DEVELOPMENT OFFICERS · GALA COMMITTEES · BOARDS

Some items hammer at 140% of FMV. Some at 35%. The difference is structural, not accidental.

The room has a fixed bidding capacity. The format determines how much of it gets unlocked. The item category determines whether each lot hammers above or below fair market value. Starting bids that are too low ruin lots that would otherwise be the night's stars. Most auction chairs design the item portfolio by what got donated — not by what the room can absorb. This tool models the expected hammer per item, the format-by-format yield, and the mix optimization.

Hammer Ratio
vs FMV per item
Format Yield
Silent vs live vs paddle
Room Capacity
What it'll bear
Mix Fix
Cut, add, reprice
YOUR AUCTION
1
Room & format
2
Silent auction items
3
Live auction items
4
Paddle raise & timing
5
Expected hammer
STAGE 1 OF 5

Room & format

The room sets the bidding capacity. The format decides how much of it the auction can unlock. A 200-person UHNW room can absorb $250-400K of auction; the same room with the wrong items and a weak auctioneer will produce $60K.

Drives expected bidding capacity per attendee. Affluent rooms typically bid $200-500/head; HNW rooms $800-2,500/head.
% of attendees who actually bid (vs. spectators). Mobile bidding pushes this higher. Industry: 35-65%.
%
A professional benefit auctioneer (BAS certified) typically lifts live-auction hammer by 25-50% vs a board member or local celebrity reading bid cards.
OneCause, GiveSmart, Greater Giving, Handbid. Drives silent-auction yield significantly.
Has this room been hit hard by other galas/auctions this season? 10 = fresh room. 5 = typical. 2 = these donors did 4 galas already this fall.
Live auctions land best in the 2nd hour (post-dinner, pre-paddle). Silent should close before live opens.
The single biggest auction lever. The auctioneer matters more than any other line item — more than the items, the room, the marketing. A BAS-certified benefit auctioneer typically lifts live-auction hammer by 25-50% above what a board volunteer produces, and lifts paddle raise by 30-100%. They cost $3-8K. They earn that back inside the first live lot. If you have one variable to fix, fix this one.
STAGE 2 OF 5

Silent auction items

The silent auction is a volume game. 20-50 items, each opening at 30-40% of FMV, closing at 65-95% of FMV with mobile bidding, 50-75% with paper sheets. Categories matter enormously.

Silent item portfolio (enter counts by category)
Category
Experiences (local — dinner with the chef, wine tasting, behind-the-scenes)
Total FMV
$
Count
Avg starting bid
$
Category
Travel packages (resort stays, weekend getaways — donated)
Total FMV
$
Count
Avg starting bid
$
Category
Wine (single bottles, cases, magnums — most-consistent yielder)
Total FMV
$
Count
Avg starting bid
$
Category
Sports memorabilia / tickets (autographed, suite access)
Total FMV
$
Count
Avg starting bid
$
Category
Jewelry / luxury goods (designer, watches — risky if FMV-discounted)
Total FMV
$
Count
Avg starting bid
$
Category
Art (signed prints, local artist originals)
Total FMV
$
Count
Avg starting bid
$
Category
Custom / once-in-a-lifetime (cooking class with celebrity chef, donor home tour)
Total FMV
$
Count
Avg starting bid
$
STAGE 3 OF 5

Live auction items

5-8 live lots, ideally. Each one is its own three-minute mini-event. Live items hammer above FMV when they are genuinely scarce — and below FMV when they're commodity travel/sports packages that anyone could buy online.

Live lots — by category
Category
Scarce experiences (private dinner at iconic restaurant, behind-the-scenes museum tour)
FMV per lot
$
Count
Starting bid
$
Category
Premium travel (private villa, yacht week, exclusive resort access)
FMV per lot
$
Count
Starting bid
$
Category
Art (signed major work, gallery-attribution piece)
FMV per lot
$
Count
Starting bid
$
Category
Custom / impossible-to-buy (CEO of major company hosts donor dinner)
FMV per lot
$
Count
Starting bid
$
Category
Sports (Super Bowl, Masters, World Series — premium access)
FMV per lot
$
Count
Starting bid
$
STAGE 4 OF 5

Paddle raise & timing

The single highest-yield 10 minutes of any gala. Paddle raise (fund-a-need) directly asks for cash gifts at named giving levels. With a professional auctioneer and pre-arranged top-tier bids, paddle raise often equals or exceeds the entire live auction.

The highest paddle raise tier. Industry: $10K-$50K depending on audience.
$
Pre-event commitments from board / top donors to bid at the highest tier publicly. Critical to anchor the room. Target: 2-3 minimum.
Realistic count of bidders at the highest tier. Usually 3-6 in a healthy room.
The 3-5 minute mission-impact story right before paddle raise. Strong story = +50-100% on paddle. Weak / generic = -30%.
STAGE 5 OF 5

Expected hammer & recommendations

Item-by-item hammer ratio, format yield breakdown, room-capacity analysis, and the mix-optimization recommendations.

HERE — TRY THESE. THEY MAY HELP.

Auction design is one of 20+ development workflows we've put into open tools.

We don't sell your data. We don't run a webinar funnel. Three honest resources, free, that we'd hand you if you walked into our office and asked where to start.

Family Office Guide Estate Planning Decoded All free tools
Practitioner reference. Outputs are estimates based on user inputs and industry-typical hammer-ratio data. Auction outcomes depend on the room dynamic on the night, the auctioneer's skill in reading bidders, the mission moment delivered, and donor-disclosure rules (IRS Pub. 526 / Pub. 1771: auction items above FMV produce only the FMV-difference as a charitable deduction for the bidder; the charity must disclose the FMV at bidding). This is not financial, tax, or legal advice.
WANT THE METHODOLOGY BEHIND THIS TOOL?
This calculator pairs with the Family Office Guide & Estate Planning Decoded.
The tool models the room's bidding capacity. The guides cover what's happening on the donor side of the paddle — how a major-gift donor or a family foundation actually decides which lots to bid on, why paddle raise commitments often get pre-arranged by phone two weeks before the event, and how to integrate auction giving into a donor's broader philanthropic planning.
Read the Family Office Guide → Browse all guides
PROFESSIONAL DISCLAIMER · PLEASE READ

Educational and informational purposes only. This calculator and any output it produces are intended solely for general educational and decision-support purposes. They do not constitute investment, tax, legal, accounting, appraisal, lending, insurance, or any other professional advice.

Estimates based on your inputs. Auction outcomes depend on factors no model can capture (room energy, auctioneer skill on the night, mission moment delivery, weather, news cycle). Use these outputs as planning guidance, not as a fundraising commitment. Charity auction items have specific IRS disclosure rules — items sold above FMV produce only the difference as a deductible contribution for the bidder; charities must disclose item FMV at bidding (Pub. 526, Pub. 1771).

Consult your own qualified professionals. Before acting on anything calculated here, consult your own attorney, CPA, or qualified appraiser as applicable.

Co-branded versions: The disclaimer applies regardless of co-branding.

Educational references and tools — not legal, tax, accounting, or investment advice, and not a recommendation to buy or sell any security. Consult a qualified professional about your specific situation. © 2026 The Baratelli Institute.