Overview
Rounding makes numbers easier to read and use while keeping them close to their original value. You can round to a whole number or a chosen decimal place, and select the rounding method that fits your needs.
Formula
Rounded value = round(number × 10^d) ÷ 10^d, where d is the number of decimal places.
How it works
Enter the number
Whole or decimal numbers are supported.
Choose places and method
Select the decimal places and rounding method.
Read the result
The rounded value and the difference from the original appear.
Worked examples
Example 1: 123.456 to two places
123.46 when rounded to the nearest.
Example 2: 2.5 with half away from zero
2.5 becomes 3, and −2.5 becomes −3.
Frequently asked questions
What is the difference between rounding and truncating?
Rounding may increase or decrease the value, while truncation simply removes extra digits without adjusting.
What happens with the digit 5?
It depends on the method: half away from zero rounds up in magnitude, while nearest may depend on the sign.
Can I round to 0 decimal places?
Yes. That means rounding to the nearest whole number.
This calculator is for educational and informational purposes only and is not a substitute for professional advice.