Round a Number
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Rounding Calculator Guide
Round a number to a chosen number of decimal places or to the nearest 10, 100, or 1000. The calculator also shows the value rounded down (floor) and rounded up (ceiling).
Look at the digit just past your rounding place. If it is 5 or more, round up; if it is 4 or less, round down. This is called rounding half up.
How Do I Round Numbers?
Decide the place you are rounding to, then check the next digit. For example, 3.14159 rounded to two decimal places is 3.14, because the next digit is 1. Rounding 1,234 to the nearest 100 gives 1,200.
Rounding, Floor, and Ceiling
Standard rounding goes to the nearest value. Rounding down (the floor) always goes to the lower value, and rounding up (the ceiling) always goes to the higher value, regardless of the next digit. These are useful when you need to guarantee you stay under or over a threshold.
Related: Scientific Notation, Percentage Calculator, and Average Calculator.
Frequently Asked Questions
How do I round to two decimal places?
Look at the third decimal digit; if it is 5 or more, round the second up, otherwise leave it — 3.14159 becomes 3.14.
How do I round to the nearest 10 or 100?
Check the digit in the place below; 1,234 rounds to 1,230 to the nearest 10 and 1,200 to the nearest 100.
What is rounding half up?
A rule where a digit of exactly 5 always rounds up, which is the most common convention.
What is the difference between floor and ceiling?
Floor always rounds down to the lower value, and ceiling always rounds up to the higher value.
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