Rounding Calculator
Round numbers to nearest integer, decimal place, significant figures, fraction, or specific rounding rules.
Round a Number
Configure your rounding target, precision, and rounding mode settings below.
Understanding Rounding Rules & Modes
Rounding simplifies numbers while keeping their value close to the original.
1. Round Half Up (Standard):
If the next digit is 5 or greater, round up. Otherwise, round down.
2. Banker's Rounding (Half to Even):
If exact half (.5), round to the nearest EVEN integer to reduce statistical bias.
3. Floor vs Ceiling:
Floor rounds toward -∞; Ceiling rounds toward +∞.
Frequently Asked Questions (FAQs)
Banker's rounding (Round Half to Even) rounds numbers ending in .5 to the nearest even number. For example, 2.5 becomes 2, and 3.5 becomes 4. This avoids upward bias in large data sets.
Significant figures represent the meaningful digits in a number starting from the first non-zero digit.