Rounding Calculator
Free Rounding Calculator: Round numbers to a specified number of decimal places, or to the nearest whole number, ten, or hundred.
Inputs
Enter the required values to calculate.
Result
The calculated result will appear here.
More Information
Understanding the Rounding Calculator
This calculator provides a simple way to round numbers to various levels of precision. Rounding is essential in mathematics and everyday life to make numbers easier to work with or to express them to a required degree of accuracy.
How Rounding Works
The standard method of rounding, used by this calculator, is as follows:
- Identify the digit at the position you are rounding to (e.g., the second decimal place).
- Look at the digit immediately to its right.
- If that digit is 5 or greater, you increase the rounding digit by one ("round up").
- If that digit is 4 or less, you keep the rounding digit as it is ("round down").
For example, rounding 12.345 to 2 decimal places: the second decimal is 4. The digit to its right is 5, so we round up, resulting in 12.35. Rounding 12.342 to 2 decimal places results in 12.34.
Rounding to Nearest 10 or 100
The same principle applies. To round 123 to the nearest 10, we look at the '3'. Since it's less than 5, we round down to 120. To round 128, we would round up to 130.