Decimal formatter
Precisely round decimal strings and pad them to a requested number of places.
Runs in your browserEvery computation happens in your browser — your data never leaves this device.
Number
Formatted result
Rounded using decimal rules.
Enter a number to format
What this tool does
- Normalize decimal places.
- Avoid binary floating-point surprises.
- Validate numeric input strictly.
Example
Input
3.14159
Output
3.14
Decimal-string rounding supports from 0 to 20 places.
Frequently asked questions
What is the default precision?
Two decimal places.
How is rounding done?
A next digit of five or more rounds up.
Is scientific notation supported?
No, to keep the format unambiguous.
Keywords：小数格式化decimal formatroundingprecisionnumber