Rounding Calculator - Calculator See


Rounding Calculator

Round numbers to the nearest whole number, tenth, hundredth, thousandth, or significant figures using standard round-half-up.

Calculator Inputs

Decimal or float.
Rounding target.

Calculated Results

Rounded Value
3.14 (Nearest Hundredth)
Round Up (Ceiling) 3.15
Round Down (Floor) 3.14
Original Input 3.14159265
Values calculate live as you adjust inputs.

About Rounding Calculator

Rounds numbers to specified decimal places or significant digits using standard commercial and mathematical rounding rules.

What is Rounding Calculator?

Rounds numbers to specified decimal places or significant digits using standard commercial and mathematical rounding rules.

How to Use This Calculator

  1. Enter number to be rounded.
  2. Choose decimal precision target.
  3. Review rounded number, floor, and ceiling.

The Mathematical Formula & Variables

Round(x, p) = floor(x * 10^p + 0.5) / 10^p

Step-by-Step Worked Example

Scenario: Round 3.14159 to the nearest hundredth.

  1. Hundredths digit is 4, followed by 1.
  2. Since 1 < 5, round down to 3.14.

Result: 3.14

Frequently Asked Questions

What is the standard rule for rounding 5?

Under standard math round-half-up, any digit equal to or greater than 5 rounds up to the next integer.