Rounding keeps numbers readable while staying close to their true value.
How to use the Rounding Calculator
- Number
- Decimal places
Results update as you type, and every field accepts the units shown in its menu.
How it works
Standard rounding goes to the nearest value, with halves rounded away from zero for positive numbers.
Inputs explained
| Field | What to enter |
|---|---|
| Number | A number |
| Decimal places | A number |
What each result means
- Rounded = round([Number], [Decimal places])
- Rounded up = ceil([Number] × 10^[Decimal places]) ÷ 10^[Decimal places]
- Rounded down = floor([Number] × 10^[Decimal places]) ÷ 10^[Decimal places]
- Nearest 10 = round([Number]÷10)×10
- Nearest 100 = round([Number]÷100)×100
- Nearest 1,000 = round([Number]÷1000)×1000
Example values
How the main result changes when Number changes and everything else stays at the example values above:
| Number | Rounded |
|---|---|
| 1,728.39 | 1,728.39 |
| 2,592.59 | 2,592.59 |
| 3,456.79 | 3,456.79 |
| 4,320.99 | 4,320.99 |
| 5,185.18 | 5,185.18 |
| 6,913.58 | 6,913.58 |
Formula
Round(x, d) = round(x × 10^d) ÷ 10^dWorked example
Inputs — Number: 3,456.7891; Decimal places: 2.
Results — Rounded = 3,456.79; Rounded up = 3,456.79; Rounded down = 3,456.78; Nearest 10 = 3460; Nearest 100 = 3500; Nearest 1,000 = 3000.
Frequently asked questions
What is banker’s rounding?
Rounding halves to the nearest even digit to reduce bias; this calculator rounds halves up.
How do I round to significant figures?
Use the significant figures calculator.
What formula does the Rounding Calculator use?
Round(x, d) = round(x × 10^d) ÷ 10^d.