Rounding Calculator
Enter a number and choose how many decimal places to round to and the rounding mode.
Rounding Modes Explained
Standard Rounding (half-up)
Round 2.5 → 3, round 2.4 → 2. The most common everyday rounding method.
Floor (round down)
Always rounds toward negative infinity: 2.9 → 2, −2.1 → −3.
Ceiling (round up)
Always rounds toward positive infinity: 2.1 → 3, −2.9 → −2.
Truncate
Drops extra digits without rounding: 2.9 → 2, −2.9 → −2.
Examples
| Number | Standard | Floor | Ceiling | Truncate |
|---|---|---|---|---|
| 3.456 (2 dp) | 3.46 | 3.45 | 3.46 | 3.45 |
| 2.5 (0 dp) | 3 | 2 | 3 | 2 |
| -1.5 (0 dp) | -2 | -2 | -1 | -1 |
