Skip to content
CalculatorBuddy

Rounding Calculator

Round a number to decimal places, place values, common fractions, or a custom precision using nine rounding methods.

Select a Precision Level

ExampleSample values — edit any field to see your result.

Results update as you type.

Rounded Result

3.142

Estimated result

Rounded Number
3.142
Rounding Difference
0.00040739999999984
Rounding Rule
Round to the nearest (default); 3 decimal places
Rounded Result3.142

Round to common decimal places, large place values, or fractional increments. Advanced tie-breaking behavior is available through all nine methods offered by calculator.net, with a second mode for custom precision from -1000 to 1000.

Formula

For increment q, the calculator rounds number / q according to the selected rule, then multiplies by q. Decimal precision p uses q = 10^(-p).

Examples

Round pi to thousandths

Rounding 3.1415926 to three decimal places gives 3.142.

Round to an eighth

15.65 rounds to the nearest 1/8 as 15.625.

Frequently asked questions

Which rounding methods are supported?
Nearest, half up, half down, ceiling, floor, half to even, half to odd, half away from zero, and half toward zero.
Can I round to a fraction?
Yes. Presets include the nearest half, quarter, eighth, sixteenth, thirty-second, and sixty-fourth.
What does a negative decimal precision mean?
It rounds to a place left of the decimal point; -1 means tens, -2 hundreds, and -3 thousands.
What is bankers rounding?
Round half to even is often called bankers rounding. Exact halfway values go to the neighboring even value to reduce cumulative bias.

Related calculators