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Armstrong Number Checker

Test if a number is an Armstrong 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 checks whether a number is an Armstrong (narcissistic) number — one equal to the sum of its own digits each raised to the power of the digit count, such as 153 = 1³+5³+3³. Numbers like 9, 153, 9474, and 9926315 are famous examples across different digit lengths.

Programming students and puzzle enthusiasts use it to explore number theory concepts and test their own code — Armstrong number checks are a classic beginner programming exercise — against a reliable reference. Enter a number to see whether it's an Armstrong number and the digit-power breakdown.

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