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Triangular Number Calculator

Find the nth triangular number.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

This calculator finds the nth triangular number using the formula T(n) = n(n+1)/2 — the sum of all whole numbers from 1 up to n, and the same count you'd get by stacking dots into a triangle with n dots on each side. T(1)=1, T(2)=3, T(3)=6, and so on.

Math students use it for number theory and combinatorics homework, and programmers use triangular numbers when counting handshakes in a group, pairs in a round-robin tournament, or the number of cells below a diagonal in a grid. Enter n to get the triangular number instantly.

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