Question 1

What does this tool do?

Accepted Answer

It rounds numbers up (ceiling) or down (floor) to the nearest integer or to a specified number of decimal places.

Question 2

What input does it accept?

Accepted Answer

Any numeric value. You choose mode: round up or round down, and optionally the number of decimal places (0 = integer).

Question 3

Are there precision limits?

Accepted Answer

JavaScript number precision applies. Very large or very small numbers may show rounding artifacts.

Question 4

Is calculation done locally?

Accepted Answer

Yes. All calculation runs in your browser.

Question 5

When should I use it?

Accepted Answer

Use it for pricing (round up), allocating resources (round down), or any rounding that must be consistent.

Question 6

Why does rounding look wrong?

Accepted Answer

Floating-point representation can cause 0.1 + 0.2 ≠ 0.3. For money, consider using integer cents or a decimal library.

Round Numbers

Frequently Asked Questions