Silent auction bid increment calculator

Calculate bid ladder and final ladder bid with your own figures.

Your numbers

Use the units shown. Results update as you change valid inputs.

Choose the currency for these amounts. Changing it keeps your numbers and does not convert exchange rates.

Use bid ladder and final ladder bid to compare changes to your inputs. The method and limits below explain the scope.

Examples

Examples

Try the starting example

Opening bid ($)
25
Minimum increase ($)
5
Further bid steps
5
Bid ladder ($)
25, 30, 35, 40, 45, 50
Final ladder bid ($)
$50.00

Try another scenario

Opening bid ($)
10
Minimum increase ($)
2.5
Further bid steps
3
Bid ladder ($)
10, 12.5, 15, 17.5
Final ladder bid ($)
$17.50
Calculation method

Calculation method

Bid ladder ($)

Opening bid + j × minimum increase, for j from zero through the number of further steps.

Final ladder bid ($)

Opening bid + further bid steps × minimum increase.

Symbols and units
a
Opening bid ($)
b
Minimum increase ($)
c
Further bid steps

Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.

Assumptions & limits

Assumptions & limits

  • Fixed monetary increments only; no percentage-based rules, bidding platform enforcement or auction outcome prediction.
Are these inputs private?

These calculations run in your browser. A shared link contains the values you choose to share. Only questions submitted to the separate AI finder are sent to OpenAI.

Further reading

OpenStax: ratios, percentages and rectangular geometry ↗

Background reading; this does not imply endorsement or independent review of SumFizz.

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