Rounding replaces a number with an approximate value. Standard rounding: ≥5 rounds up, <5 rounds down. But there are many modes: floor (always down), ceiling (always up), truncation (remove digits), and banker's rounding (half to even, which reduces cumulative bias in financial calculations).
How to Use
Enter a number and choose rounding:
- Places: Decimal places to keep
- Mode: Standard, floor, ceiling, banker's
- Compare: All modes shown side by side
Rounding Modes
- Standard: Round half up (2.5 → 3)
- Floor: Always down (2.9 → 2, −2.1 → −3)
- Ceiling: Always up (2.1 → 3, −2.9 → −2)
- Truncate: Remove decimals (−2.9 → −2)
- Banker's: Half to even (2.5 → 2, 3.5 → 4)
Why Different Modes?
Standard rounding biases upward (more numbers round up than down). Banker's rounding eliminates this bias, making it ideal for financial and statistical calculations.
Step-by-Step Instructions
- 1Enter a number.
- 2Select decimal places.
- 3Choose a rounding mode.
- 4Compare all modes side by side.
- 5Copy the rounded result.