Numeral System Converter

What this tool does

A numeral system is a set of glyphs for writing numbers; a writing system is the letters. Many scripts have both, and their digits are frequently mixed with Western Arabic numerals in the same document. That is fine for a human reader and awkward for software: a database column expecting 123 will not accept ๑๒๓, sorting puts them in the wrong order, and search misses matches entirely.

This tool converts between twenty-two digit sets defined in the Unicode Standard, and can also normalise a mixed text to Western Arabic numerals in one step.

Method

Every supported script stores its ten digits as consecutive code points, with zero at a known base. The converter builds the source and target digit strings from those bases and performs a one-to-one glyph substitution; digits that do not appear in the source script are left unchanged. This is why the conversion is lossless and why mixed text survives intact. The normalise mode scans for digits from every supported script and maps each one to its Western Arabic equivalent.

Supported scripts

Script	Digits	Used in
Western Arabic (0–9)	0123456789	Worldwide
Thai	๐๑๒๓๔๕๖๗๘๙	Thailand
Lao	໐໑໒໓໔໕໖໗໘໙	Laos
Khmer	០១២៣៤៥៦៧៨៩	Cambodia
Myanmar (Burmese)	၀၁၂၃၄၅၆၇၈၉	Myanmar
Devanagari	०१२३४५६७८९	Hindi, Marathi, Nepali
Bengali	০১২৩৪৫৬৭৮৯	Bengali, Assamese
Gurmukhi	੦੧੨੩੪੫੬੭੮੯	Punjabi
Gujarati	૦૧૨૩૪૫૬૭૮૯	Gujarat
Odia	୦୧୨୩୪୫୬୭୮୯	Odisha
Tamil	௦௧௨௩௪௫௬௭௮௯	Tamil Nadu, Sri Lanka, Singapore
Telugu	౦౧౨౩౪౫౬౭౮౯	Andhra Pradesh, Telangana
Kannada	೦೧೨೩೪೫೬೭೮೯	Karnataka
Malayalam	൦൧൨൩൪൫൬൭൮൯	Kerala
Sinhala Lith	෦෧෨෩෪෫෬෭෮෯	Sri Lanka
Tibetan	༠༡༢༣༤༥༦༧༨༩	Tibet
Arabic-Indic	٠١٢٣٤٥٦٧٨٩	Arabic-speaking countries
Extended Arabic-Indic (Persian, Urdu)	۰۱۲۳۴۵۶۷۸۹	Iran, Pakistan, Afghanistan
Mongolian	᠐᠑᠒᠓᠔᠕᠖᠗᠘᠙	Mongolia
Full-width	０１２３４５６７８９	CJK typography
Mathematical bold	𝟎𝟏𝟐𝟑𝟒𝟓𝟔𝟕𝟖𝟗	Mathematical notation
Mathematical double-struck	𝟘𝟙𝟚𝟛𝟜𝟝𝟞𝟟𝟠𝟡	Mathematical notation

Example

Input	Direction	Output
เลขที่ ๑๒๓/๔๕	Thai → Western Arabic	เลขที่ 123/45
१२३	Devanagari → Western Arabic	123
١٢٣	Arabic-Indic → Western Arabic	123
123	Western Arabic → Khmer	១២៣
123	Western Arabic → Full-width	１２３

Frequently asked questions

What is a numeral system script?

Many writing systems have their own ten digit glyphs for 0–9 while using the same decimal idea. Thai ๐, Devanagari ० and Arabic-Indic ٠ all mean zero; the value is identical, only the shape changes.

Does converting change the number?

No. It is a glyph-for-glyph substitution, so ๑๒๓ and 123 represent the same value. Nothing is rounded or reformatted.

Can I mix scripts in one text?

Yes. The converter only replaces digits belonging to the selected source script, so letters, punctuation and other scripts pass through untouched. There is also a normalise mode that turns every digit it recognises into Western Arabic numerals.

Why would I need this?

Numbers copied from official documents, PDFs and scanned forms often use local digits. Systems that expect 0–9 will reject them, and sorting behaves inconsistently. Converting normalises the data without changing it.

Does it work in Excel or Google Sheets?

Neither has a built-in function for these digit sets, and results vary by locale. The reliable route is to convert here and paste the values back, or to use a script-based custom function.

Are the digit tables complete?

Yes. Each row maps ten consecutive code points from the Unicode Standard, so every digit of that script is covered.

Go deeper

Longer explanations of the problems this tool solves:

Sources

Unicode Standard, Digits and the script blocks listed above (Thai, Lao, Khmer, Myanmar, Devanagari, Bengali, Gurmukhi, Gujarati, Odia, Tamil, Telugu, Kannada, Malayalam, Sinhala, Tibetan, Arabic, Mongolian, Full-width Forms, Mathematical Alphanumeric Symbols).
The Unicode Character Database, which defines the general category Nd (decimal digit) used to validate the tables.