Java Exponents: How to Calculate Powers and Large Numbers

In Java, use Math.pow(base, exponent) for quick power calculations — Math.pow(2, 4) returns 16.0.

The Standard Approach: Math.pow()

For everyday math, Math.pow() is the right tool.

Where Math.pow() Breaks: The Precision Cliff

A double can only hold about 15–17 significant decimal digits exactly.

The Right Tool for Large Numbers: BigInteger

When you need exact results of any size, use BigInteger .

Rolling Your Own: Loops and Recursion

Sometimes you want exponentiation without Math.pow — perhaps to stay in integer arithmetic, or as an interview exercise.

Get the full story

Read the complete breakdown, fixes and what happens next.