A bid increment is the minimum amount a guest must add to make the next valid bid. It sounds like a small setup detail, but it shapes the whole feel of a silent auction. Make the jump too large and a willing bidder may stop because the next amount feels out of reach. Make it too small and the room can fill with bids without the price moving far enough during the time you have.
The goal is not to find one magic percentage and apply it everywhere. The goal is to give each item a clear, inviting path from its opening bid toward a worthwhile result. This guide shows how to choose that path, communicate it on the bid sheet, and give volunteers a system they can use without stopping the event to do math.
A simple starting point for bid increments
- Start with the item’s realistic fair market value.
- Choose an opening bid that feels approachable for your guests.
- Decide how many meaningful bidding steps you want before reaching your target.
- Divide the gap, then round to an easy amount such as $5, $10, $25, or $50.
- Put the same instruction on every relevant bid sheet and brief volunteers on it before doors open.
What Is a Silent Auction Bid Increment?
Think of the increment as the rung on a bidding ladder. If a sheet shows a current bid of $50 and a minimum increase of $10, the next acceptable bid is $60 or more. The amount needs to be visible enough that a guest can understand it while standing in a busy room, without finding a volunteer or comparing several signs.
That clarity matters just as much as the amount. A fundraising toolkit from the Emergency Nurses Association explains the same basic pattern: a minimum increase requirement tells bidders exactly how much more the next bid must be. It also reinforces the companion rule that a silent auction needs a predetermined closing point. Its event-planning guidance is a useful reminder that the increment and the closing process should be planned together.
For a paper auction, you can state the minimum increase in a short line near the top of the sheet or pre-print a price ladder. For a mobile auction, the platform may calculate the next valid bid automatically, but guests still benefit from knowing how the amount is being set. In either format, use the same language from item to item.
Start With the Item, Not a One-Size-Fits-All Number
A $5 increase might make perfect sense on a $75 restaurant certificate. The same $5 increase on a premium travel package could create a long series of tiny moves that never reaches a useful level. On the other hand, a $100 increase may be reasonable for a highly desirable experience, but intimidating for a broad community audience bidding on a mid-range item.
Start by writing down the item’s fair market value, meaning what a buyer would normally pay for it in an open market. Use a real current price, a donor-provided value you can support, or a sensible comparison for an experience. Avoid inflating the number to make a package sound more impressive. Guests often recognize a value that does not feel credible, and trust is hard to rebuild once it slips.
Next, consider the people in the room. A school fundraiser, local benefit, and formal gala may all offer the same type of item, but their guests may be comfortable with very different steps. Look at the spending patterns and item results from previous events when you have them. If you do not, keep the first event simple, record what happened, and use those notes to make the next one smarter.
Set the Opening Bid and Increment as a Pair
The opening bid gets people into the auction. The increment determines how the item moves after that first commitment. They only make sense together. An approachable opening bid paired with a huge next step can still stop bidding cold. A high opening bid paired with very small steps can leave the item sitting at a price guests were never eager to pay.
Many organizers use an opening bid somewhere below the item’s fair market value to invite early participation. Bloomerang’s current auction guidance uses a 30% to 50% starting range as a practical benchmark, then recommends rounded increments that can move an item toward 70% of value in roughly five to ten bids. Their explanation of recommended auction amounts is useful because it focuses on the whole path, not just one isolated setting.
Use that principle, not a rigid rule. A rare item with a small pool of serious bidders may need a different opening point than a popular family package. A donated item with restrictions may need a lower entry point to encourage attention. The strongest setup is the one your guests can understand and your volunteers can support confidently.
Use a Simple Formula to Check the Path
Once you know the opening bid and the amount you would like an item to reach, decide how many bidding steps feel realistic. Then use this planning formula:
Bid increment = (target selling price − starting bid) ÷ desired number of increases
For example, imagine a package valued at $500. You might open at $200 and hope it can reach $450. If you want about ten increases between those points, the calculation is $25. That gives guests a clean sequence: $200, $225, $250, and so on. The math is not a promise that the item will reach the target. It is a way to check that the bidding route is neither frustratingly long nor abruptly steep.
After you calculate, round to an amount that feels natural. A $22.50 step may be accurate on paper, but it creates needless friction in a crowded room. $20 or $25 will be easier to read, announce, and write. Bidding Owl’s guide to setting bid increments similarly recommends rounding calculated numbers to familiar amounts and checking the starting bid, target, and intended number of increases together.
A Practical Starting Table
Use this table as a conversation starter, not a fixed price list. It assumes an opening bid around 40% of value and a target near 70% to 80%, then chooses an easy amount that creates a reasonable route. If your audience, item quality, or event format says otherwise, adjust the plan before you print.
| Item value | Example opening bid | Possible increment | Why it can work |
|---|---|---|---|
| $50 to $100 | $20 to $40 | $5 | Small enough to invite participation without making every step feel trivial. |
| $100 to $250 | $40 to $100 | $10 to $15 | Creates a clear path for common gift baskets, dining, and local experiences. |
| $250 to $500 | $100 to $200 | $20 to $25 | Keeps progress visible without asking for a jarring jump. |
| $500 to $1,000 | $200 to $400 | $25 to $50 | Suited to higher-value packages when guests expect a more substantial next bid. |
| Over $1,000 | Set item by item | $50 or more | Needs individual review, because appeal and audience matter as much as value. |
If your auction has a large catalog, value ranges can keep setup manageable. Use one standard for a group of comparable items, then review premium, unusual, or especially desirable packages separately. That gives the team a repeatable system without pretending that every donation has the same audience.
Know When the Increment Is Too Large
A large increment can make a popular item look quiet. Watch for an item that gets one early bid but no response when the next required number appears. That may mean the next step is too ambitious, although it can also mean the opening bid was high, the value is unclear, or the item simply does not match the crowd.
Consider a $100 item sitting at $90 with a required $20 step. The next valid bid is $110, above the value many guests have in mind. A guest might happily bid $95 or $100, yet walk away because $110 feels like a leap. A smaller increment is not a cure for every slow item, but it can remove an avoidable barrier when the price is near a natural decision point.
Online auctions may allow you to adjust the setting before the final window, depending on the platform and the rules you have communicated. Paper bid sheets are less forgiving because the number is already printed. That is why it is worth testing the price ladder before the event, rather than asking volunteers to make up exceptions at the table.
Know When the Increment Is Too Small
Very small steps can be just as unhelpful. If a $500 package needs dozens of bids to reach a reasonable result, the auction may run out of time before the price gets there. On a paper sheet, the lines can fill quickly, guests may struggle to see the current high bid, and volunteers can spend too much energy maintaining one popular item.
Look for a number that keeps each next bid approachable while still making visible progress. If an item gathers plenty of attention but its price barely moves, increasing the planned step for similar items next time may make more sense. Record the starting bid, increment, number of bids, final price, and any guest feedback after the event. Those notes are far more useful than guessing next year.
Make the Next Bid Obvious on Every Sheet
Even a well-chosen increment fails if guests cannot find it. Put the item title, fair market value when appropriate, starting bid, minimum increase, bidder-number instruction, and closing time in a consistent place on every sheet. Use enough contrast and type size that the details are readable without lifting the sheet off the table.
For a fixed paper ladder, pre-print the allowed amounts. That removes mental math and makes it easier for volunteers to spot an invalid line. If guests can write any amount above the minimum, make the phrase unmistakable: “Increase by $10 or more.” Our silent auction bid sheet guide covers the other details that make a sheet easier to use.
Support the sheets with visible room-level direction. A clear rules sign near registration can explain the bidding method and closing time, while table signs can reinforce the important details. Custom paddle signs can help carry those cues across a larger event space, especially when guests need to spot the auction area from across the room.
Brief Volunteers Before Guests Arrive
Volunteers should know the same rules that guests see, plus the answers to predictable edge cases. Decide in advance how to handle a bid that skips the required increase, a full sheet, an unreadable bidder number, or two matching final bids. Give the team one short written procedure and identify who can make the final call if something unusual happens.
Walk through a few examples together. If a sheet is at $60 with a $10 increase, what happens when someone writes $65? If the final two bids match, who records the winner? If a popular item fills its page, where is the continuation sheet? Small rehearsals make the event feel calmer because the team is not inventing rules under pressure.
Pair this work with the broader silent auction rules guide and the step-by-step event guide. Together, they help move from a single correct bid amount to a full bidding experience guests can trust.
Build a Bidding Path Guests Want to Climb
Good increments make participation feel possible. They show guests what to do next, keep the auction moving, and help volunteers handle the room with confidence. The best number is not necessarily the biggest or smallest one. It is the amount that matches the item, the audience, the opening bid, and the time available to let competition develop.
Custom Paddles Plus helps fundraising teams create the visible event details that support an organized auction, from numbered paddles and light-up options to signs, fans, and custom pieces. Explore the auction and event collection, then request a custom quote when you are ready to plan materials that help every step stand out.
