Rounding Calculator

Round a number to a chosen number of decimal places or to the nearest ten, hundred, or other multiple, with round, round up, and round down modes. Calculates in your browser.

Use a negative value to round to tens, hundreds, and so on.

Rounded value

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Show the math

Standard rounding sends a trailing digit of 5 or more up, anything below down:

round · round up (ceiling) · round down (floor)

Rounding to decimal places controls precision, while rounding to a multiple, the nearest 5, 10, or 0.25, is what you want for money, measurements, and tidy estimates. All math runs locally in your browser.

What this does

A rounding calculator rounds a number to a chosen number of decimal places, or to the nearest ten, hundred, or other multiple. You can round normally, always up, or always down.

How to use it

  1. Enter the number.
  2. Choose the decimal places, or a multiple to round to.
  3. Pick a mode, round, round up, or round down.
  4. Read the rounded result.

How it works

Standard rounding sends a trailing digit of 5 or more up and anything below 5 down. Round up (ceiling) always goes to the larger value, round down (floor) to the smaller. Rounding to a multiple snaps the number to the nearest step you choose.

Understanding your result

The mode is what changes the answer at the boundary: standard rounding is closest-value, while round up and round down force the direction regardless of the trailing digit. Rounding to decimal places controls precision, whereas rounding to a multiple, the nearest 5, 10, or 0.25, is what you want for money, measurements, and tidy estimates.

Example

3.14159 rounded to 2 decimal places is 3.14; 1,234 rounded to the nearest hundred is 1,200.

Sources & methodology

Last updated .

Frequently asked questions

How does standard rounding work?

A final digit of 5 or more rounds the number up; less than 5 rounds it down. So 2.5 becomes 3 and 2.4 becomes 2.

What is the difference between round up and round down?

Round up (ceiling) always moves to the larger value, and round down (floor) always to the smaller, regardless of the trailing digit. 2.1 rounds up to 3 or down to 2.

Can I round to the nearest 10 or 100?

Yes. Choose a multiple to round to and the number snaps to the nearest step, the nearest 5, 10, 100, or even 0.25.

Is my data stored?

No. Everything is calculated locally in your browser.