How to Use the Rounding Calculator
Enter any number and choose how many decimal places to keep. The calculator instantly returns all three rounding results: standard rounding, ceiling (always round up), and floor (always round down). Use negative decimal places to round to whole-number positions.
- Round: the standard rule — ≥ 5 rounds up, < 5 rounds down.
- Ceiling: always moves to the next higher value.
- Floor: always drops to the next lower value.
Example: 3.14159 at 2 decimal places → Round: 3.14 / Ceil: 3.15 / Floor: 3.14
Frequently Asked Questions
Does ceiling always give the larger number?
For positive numbers yes. For negative numbers, ceiling moves toward zero (less negative), while floor moves further from zero.
Can I round to the tens or hundreds place?
Yes. Enter -1 for tens, -2 for hundreds. Example: 1,234 rounded to -1 places → 1,230.
How many decimal places are supported?
Up to 15 decimal places. Beyond that, JavaScript floating-point precision may reduce accuracy.