About this tool: Number Rounding
Round decimal values to significant figures or decimal places, with ties away from zero.
Significant figures control the total useful digits, while decimal places control the position after the decimal separator. The rounding rule is symmetric: 1.25 becomes 1.3 and −1.25 becomes −1.3 at one decimal place. String arithmetic avoids the usual binary rounding surprises.
How the calculation works
Worked example
| Input | 123.456 |
| Mode | Significant figures |
| Precision | 3 |
123
Questions and answers
What does this tool do?
Round decimal values to significant figures or decimal places, with ties away from zero. Significant figures control the total useful digits, while decimal places control the position after the decimal separator. The rounding rule is symmetric: 1.25 becomes 1.3 and −1.25 becomes −1.3 at one decimal place. String arithmetic avoids the usual binary rounding surprises.
What affects precision and input format?
These operations preserve integer or decimal precision with string and integer arithmetic. Input size is limited to keep the page responsive.
Where are the calculations performed?
The calculation runs in your browser. You can use the tool without installing software.
Asted Cloud
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