Pi Approximator

What approximation means here

Pi is irrational, so its decimal expansion never ends. Any displayed value such as $3.14159$ is therefore an approximation.

This page rounds $pi$ to the precision you choose, then compares the absolute error with classic fractions that are often used for quick hand calculations.

Useful benchmarks

22/7 is simple and common, but visibly less accurate.
355/113 is far closer to π and still easy to write as a fraction.
Extra decimal places reduce rounding error when geometry results need tighter precision.

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