Rounding Calculator

Round any number to a set number of decimal places, or to the nearest ten, hundred, thousand, and beyond.

Rounding Calculator

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Number

Round to Nearest thousand Nearest hundred Nearest ten Nearest whole number 1 decimal place 2 decimal places 3 decimal places 4 decimal places

Rounded result

4827

Uses standard "round half up" rounding - a value exactly at the midpoint rounds up.

The method

Look at the digit right after your rounding place 5 or higher: round up 4 or lower: round down (stays the same)

Example

4,827.3659 rounded to the nearest hundred: look at the tens digit (2) - since it's below 5, round down to 4,800.

Step-by-step guide

1. Enter your number.
2. Choose what place to round to - a decimal place, or a whole-number place value like tens or hundreds.
3. Read the rounded result.

Why "round half up" isn't the only rounding rule

This calculator uses the most common convention taught in school: at exactly the midpoint (like 4.5 rounding to a whole number), round up. But it's worth knowing this isn't universal - some programming languages and statistical contexts use "round half to even" (also called banker's rounding), where 4.5 rounds to 4 and 5.5 rounds to 6, specifically to avoid a small upward bias when rounding large sets of numbers repeatedly. If a result from a spreadsheet or another tool looks off by exactly one unit at a midpoint value, this difference in convention is often why.

Common mistakes

Rounding step by step through multiple place values instead of directly from the original number - always round from the original, full-precision value to avoid compounding small errors.

Mixing up "2 decimal places" with "2 significant figures" - decimal places count digits after the decimal point specifically, while significant figures count differently (see our Significant Figures Calculator).

Frequently asked questions

What happens at exactly the midpoint, like 2.5?

This calculator rounds it up (2.5 becomes 3), following the standard "round half up" convention most commonly taught in school and used in everyday contexts.

Can I round a negative number?

Yes - enter it with a minus sign, and it rounds normally, keeping its negative value.

What's the difference between rounding and truncating?

Rounding adjusts to the nearest value at your chosen place, potentially rounding up or down. Truncating simply cuts off the remaining digits without any adjustment - 4.89 truncated to 1 decimal place is 4.8, not the rounded 4.9.

Related calculators

See the full list of Math calculators, or try:

• Significant Figures Calculator
• Percentage Calculator