EVERYDAY PLANNING · VERSION 1.0.0

Combination Calculator

Count unordered selections without replacement.

Instant calculationCompare five scenariosJSON + CSV exports

Your inputs

Calculation results

Formula & assumptions

C(n,k) = n!/[k!(n−k)!]; large results are approximate.

Values use the specified units. Calculations use floating-point arithmetic. Check input measurements and formula assumptions before applying the result.

Compare your scenarios

Save up to five results to compare changes side by side. Scenarios stay in this tab until you clear or reload it.

Using Combination Calculator

Count unordered selections without replacement.

Enter available items, selected items using the units printed under each field.
Choose Calculate, or enable live updates. Review the result labels and formula assumptions.
Save scenarios to compare up to five variations, then copy the report or download JSON or CSV.

Example

Available items: 10 items
Selected items: 3 items
Unordered selections: 120
Exact integer flag: 1

Questions & answers

What does Combination Calculator calculate?

Count unordered selections without replacement.

Which units should I enter?

Available items uses items. Selected items uses items. Convert values to these units before calculating.

Which formula does it use?

C(n,k) = n!/[k!(n−k)!]; large results are approximate.

What does the included example show?

Available items: 10 items; Selected items: 3 items. Result: Unordered selections = 120; Exact integer flag = 1.

Can I compare different settings?

Yes. Save a scenario, change the inputs and save another result. Up to five scenarios are compared in this tab; they disappear when you reload or leave.

Can I export the calculation?

Copy the JSON report or download JSON and CSV with inputs, result labels and numeric values. Processing uses local JavaScript; no calculation request is sent to our server. Displayed values use up to 10 significant digits; exports retain JavaScript numeric precision.