Number Formatter

1234567.891 formatted as grouped is "1,234,567.89".

How it works

• Read the value and the requested grouped style.
• Applied the style's rule (grouping, precision, notation, ordinal suffix or compact unit).
• Produced a locale-independent, byte-stable string.

1234567.891 → 1,234,567.89

• Formatting never changes the numeric value, only how it is written.

Methodology

1. Select the formatting rule for the requested style.
2. For grouped output, insert the chosen separator every three integer digits.
3. For engineering output, normalise the exponent to the nearest lower multiple of three and scale the mantissa.
4. For ordinal output, append the English suffix (st, nd, rd, th) using the 11–13 exception.
5. For compact output, divide by the largest SI-style power of 1000 and append its letter.

Usage

1. Enter the number to format.
2. Choose the formatting style.
3. Set the decimal places or significant figures, and the grouping separator where relevant.
4. Read the formatted string.

Examples

These are examples, not current values: they use fixed inputs, while the interactive tool computes live results in your browser.

Group with two decimals

{
  "value": 1234567.891,
  "style": "grouped",
  "decimals": 2
}

Significant figures

{
  "value": 3.14159,
  "style": "significant",
  "decimals": 4
}

Scientific notation

{
  "value": 0.0001234,
  "style": "scientific",
  "decimals": 3
}

Compact abbreviation

{
  "value": 1234567,
  "style": "compact",
  "decimals": 1
}

English ordinal

{
  "value": 42,
  "style": "ordinal"
}

Limitations

Presentation, not rounding of the value

Formatting changes how many digits are shown and how they are grouped or abbreviated; it does not change the underlying number. A value formatted with two decimals is still the same value.

Because locale-aware formatting varies with the runtime's ICU data, this tool implements the formatting rules directly so identical input always produces identical output.