Rounding Calculator
Round to N decimals, plus floor and ceiling.
How it works
Rounded = round(value × 10ⁿ) ÷ 10ⁿ
Rounding goes half up; floor goes toward −∞ and ceil toward +∞.
Worked example
3.14159:
- 2 decimals → 3.14
- 4 decimals → 3.1416
- Integer → 3
Note that 2.5 and 3.5 may round differently in languages using banker’s rounding.
Notes and limitations
Round once, at the end; rounding every step accumulates error. In finance and statistics, decide explicitly between half-up and banker’s rounding and apply it consistently.