Decimal Places Calculator
Decimal places represent the number of digits after the decimal point in a number. This calculator rounds any number to a specified number of decimal places and displays the rounding decision. For example, rounding 3.4567 to 2 decimal places gives 3.46 (because the next digit is 6, which rounds up). The calculator shows you which digit is being rounded and whether it rounds up or down. Rounding to decimal places is essential in financial calculations (currency is typically rounded to 2 decimal places), scientific measurements, and everyday use. It is distinct from significant figures, which count meaningful digits across the entire number regardless of the decimal point position.
Rounding to decimal places
Identify the digit at the desired decimal place
Look at the next digit to the right
If next digit >= 5: round the current digit up
If next digit < 5: keep the current digit
Remove all digits after the rounding point
Common decimal place examples
| Original Number | Rounded to 2 Places | Rounded to 1 Place |
|---|---|---|
| 3.4567 | 3.46 | 3.5 |
| 2.234 | 2.23 | 2.2 |
| 5.995 | 6.00 | 6.0 |
| 1.1149 | 1.11 | 1.1 |
| 7.505 | 7.50 or 7.51 | 7.5 |
Decimal places calculator: frequently asked questions
What are decimal places?
Decimal places are the number of digits after the decimal point. For example, 3.14 has 2 decimal places, 3.1415 has 4 decimal places, and 3 has 0 decimal places.
How do you round to a specific number of decimal places?
Look at the digit immediately after the desired decimal place. If it is 5 or higher, round up the last digit you are keeping. If it is 4 or lower, leave the last digit as is. For example, 3.4567 rounded to 2 decimal places is 3.46 (because the next digit is 6).
What is the difference between decimal places and significant figures?
Decimal places count digits after the decimal point. Significant figures count meaningful digits starting from the first non-zero digit. For example, 0.0045 has 4 decimal places but only 2 significant figures.
Can a whole number have decimal places?
Yes, technically a whole number like 5 can be written as 5.00 with 2 decimal places. However, when written without a decimal point, it is understood to have 0 decimal places.
What is the purpose of rounding to decimal places?
Rounding to decimal places simplifies numbers, reduces precision to what is meaningful (especially in money with 2 decimal places), and makes results easier to read and use.
Official sources
- Decimal rounding: NIST Special Publication 330.
Reviewed by the CalculatorHub team, edited by James Graham, 14 June 2026. See our methodology.