Enter a number and how many decimal places to round it to.

Rounding the right way

Rounding replaces a number with a shorter, simpler value at a chosen level of precision. The common rule sends a trailing five upward, so 3.14159 becomes 3.14 at two decimal places. Choosing the right precision matters: too few places loses accuracy, too many add false confidence.

Some tasks demand a fixed direction rather than nearest value. Pricing often rounds up, and capacity planning may round down to stay safe. This calculator shows the nearest value alongside round up and round down so you can apply whichever rule fits.

The formula

Worked example

3.14159 rounded to 2 decimal places is 3.14.

How to read your result

Standard rounding sends a trailing 5 upward. The tool also shows the floor (round down) and ceiling (round up) so you can pick the rule your task requires.

Frequently asked questions

How is a 5 rounded?

This calculator rounds a trailing 5 up, the most common convention.

Can I round to whole numbers?

Yes, set decimal places to 0.

Why show round up and down separately?

Some tasks, like pricing or capacity, require always rounding one direction.

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