toolsko

Choose your language

ToolsKo is written in English. Prefer another language? Open a translated version of this public page.

Browser language suggestion: English. You can choose any language below.

Translation opens in a new tab using Google Translate. It receives this public page URL. Automatic translations may contain mistakes; use the original English page for tool inputs, downloads, and generated documents.

Your choice is remembered on this browser when storage is available. Use Language in the header to change it.

Permutation & Combination Calculator

Count ordered arrangements or unordered selections.

Tool inputs stay in your browser · optional AI search sends your query

Good to know: nCr counts unordered selections; nPr counts ordered selections. Items are distinct and cannot repeat. Results use floating-point arithmetic. All calculations stay in your browser.

How to use it (step by step)

  1. 1Fill in the boxes: “Available items”, “Items selected”. Example numbers are already there so you can see how it works; replace them with yours.
  2. 2The result updates instantly as you type (on a phone it is below the boxes).
  3. 3The bold line is the main answer. Tap Copy next to any value to copy it.

Words to know

Factorial / permutation / combination
Ways to count arrangements. 5! = 5×4×3×2×1. Permutations care about order; combinations do not.

More in Math

Sphere CalculatorFind sphere volume and surface area.Distance & Midpoint CalculatorDistance and midpoint between two Cartesian points.Slope & Line Equation CalculatorFind slope and intercept from two points.Two Linear Equations SolverSolve ax + by = e and cx + dy = f.Arithmetic Sequence CalculatorFind the nth term and sum of a constant-difference sequence.Geometric Sequence CalculatorFind the nth term and finite geometric sum.