🔢 String Number Converter

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Example:
Data Type:
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Input Length:
Output Length:
Values Count:
Range: to
Average:
Sum:
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Integers:
Floats:
Zero Values:
Positive:
Negative:
Precision Loss:
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String: 42 (characters: 52 50)
Integer: 42
Float: 42.000
Scientific: 4.200e1
Words: forty-two
Roman: XLII
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ℹ️ About String ⇄ Number Converter

String ⇄ Number Conversion translates between text, Unicode code points, integers, decimals, scientific notation, English number words, and Roman numerals. Use it as a text to number converter, number to words converter, Unicode code point converter, scientific notation converter, or quick Roman numeral helper when data needs to move between human-readable and machine-readable forms.

Text input is read as Unicode characters and converted to code points, so ABC becomes 65 66 67. Numeric input accepts whitespace, comma, or newline separated values, so 42, 255, 1024 can be converted to text, number words, Roman numerals, or exponential notation. The implementation follows the Unicode code point model described by the Unicode Standard and the ECMAScript numeric behavior defined for the Number type.

Supported conversion modes:

  • String/Text: convert characters to Unicode scalar values and back with String.fromCodePoint() behavior.
  • Integer: parse signed whole numbers and truncate decimal input when integer output is selected.
  • Float/Decimal: format numeric values to three decimal places for normalized spreadsheet or log output.
  • Scientific Notation: convert values such as 1.23e4 or -5.67e-3 with exponential output.
  • Number Words: parse common English tokens such as one, twenty, hundred, and million.
  • Roman Numerals: convert additive and subtractive notation using I, V, X, L, C, D, and M.

Examples:

  • Hello as string to integer returns the Unicode code points 72 101 108 108 111.
  • 255 as integer to scientific notation returns 2.550e+2.
  • five ten twenty fifty as number words to Roman numerals returns V X XX L.
  • XLII as Roman numerals to integer returns 42.

Common use cases:

  • Debug character encoding by converting text to decimal Unicode code points.
  • Normalize imported CSV or log values into integers, fixed decimals, or scientific notation.
  • Generate readable number words for fixtures, labels, documents, and teaching material.
  • Convert Roman numeral examples for dates, outlines, clocks, and legacy catalog data.
  • Check how a numeric token will be interpreted before sending it to an API or database.

Limits and parsing notes: JavaScript numbers are IEEE 754 double-precision values, so integers larger than Number.MAX_SAFE_INTEGER may lose precision. Floats and scientific notation are rounded for display, integer output truncates fractional values, and invalid Unicode code points render as the replacement character. Roman numeral output is limited to the conventional range 1-3999; unsupported values are shown in parentheses. The separate Roman numeral reference page is useful for deeper rules, while Britannica's Roman numeral overview and the Unicode Number Forms chart give useful historical and character-set context.

See also the ECMAScript definitions for exponential number formatting and code point to string conversion when exact runtime behavior matters.

API Usage Example:

POST /api/tools/conversion/string-number
Content-Type: application/json

{
    "text": "ABC",
    "from_type": "string",
    "to_type": "integer"
}
Ready