What is the difference between ceil and round?

Ceiling always rounds up to the next integer (or decimal). Rounding rounds to the nearest value — up if ≥ 0.5, down if < 0.5. Example: 2.3 ceil = 3, round = 2.

What is the difference between floor and truncate?

For positive numbers they are identical. For negative numbers: floor rounds toward −∞, truncate rounds toward 0. Example: −2.7 floor = −3, truncate = −2.

How do I round to 2 decimal places?

Select '2 decimal places' and enter your number. Example: 3.14159 rounded to 2 decimal places = 3.14.

🔢Rounding Calculator

Q: What is the difference between floor and truncate?

For positive numbers they are identical. For negative numbers: floor rounds toward −∞, truncate rounds toward 0. Example: −2.7 floor = −3, truncate = −2.

Q: How do I round to 2 decimal places?

Select '2 decimal places' and enter your number. Example: 3.14159 rounded to 2 decimal places = 3.14.

Compare ceiling, floor, round, and truncate at any decimal place simultaneously.

Number

Decimal Places

How to Use the Rounding Calculator

The Rounding Calculator shows ceiling, floor, rounding, and truncation results for any number at a selected precision level — all at once. This lets you compare the four main rounding methods side by side, which is useful for financial calculations, programming, statistics, and everyday math.

Choose a decimal precision from whole number up to 4 decimal places, or even round to the tens, hundreds, or thousands place. Enter any number and the four results appear instantly.

Rounding Methods Explained

Ceiling: always rounds up. Floor: always rounds toward −∞. Round: rounds to nearest (≥ 0.5 up, < 0.5 down). Truncate: drops the extra digits toward 0. Example: 2.7 → ceil 3, floor 2, round 3, truncate 2. For −2.7 → ceil −2, floor −3, round −3, truncate −2.

Frequently Asked Questions

Why does truncate differ from floor for negative numbers?

Floor rounds toward −∞, while truncate rounds toward 0. For −2.7, floor = −3 but truncate = −2.

How do I round to the nearest hundred?

Select "Hundreds place." Example: 12,345 rounded to the nearest hundred = 12,300.

Are there floating-point precision issues?

JavaScript floating-point arithmetic may introduce tiny errors, but results are accurate within the displayed decimal places.

How to Use the Rounding Calculator

Rounding Methods Explained

Frequently Asked Questions

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