Numeral converter
Type a number in any form: 123, ١٢٣, ۱۲۳ or Roman MMXXVI. See it in every other form and written out in Arabic and English words.
Digits in any script, with or without commas, or Roman letters (I V X L C D M). Whole numbers up to 999,999,999,999 for words.
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Good to know
0123456789 are Western digits. ٠١٢٣٤٥٦٧٨٩ are Arabic-Indic digits, used in much of the Arab world. ۰۱۲۳۴۵۶۷۸۹ are Eastern Arabic-Indic digits, used for Persian and Urdu: 4, 5 and 6 look different. They are separate characters to a computer, so a form may reject one set even when the number is the same.
The digits 0 to 9 came from India and reached Europe through Arabic mathematics, including the works of al-Khwarizmi. Fibonacci's book Liber abaci (1202) spread them widely, so in English they are still called Arabic numerals.
The words here are the counting form, as you read a number aloud. Inside a sentence they change with the noun: three books is ثلاثة كتب but three pages is ثلاث صفحات, and after 11 to 99 the noun is singular: أحد عشر كتاباً.
I=1, V=5, X=10, L=50, C=100, D=500, M=1000. A smaller letter before a bigger one is taken away: IV is 4, XC is 90. There is no zero, and the standard form stops at 3999 (MMMCMXCIX).
Sources: The Unicode Standard, Arabic block (Arabic-Indic digits U+0660–U+0669 and Extended Arabic-Indic digits U+06F0–U+06F9); Encyclopaedia Britannica, "Liber abaci" (1202, Hindu-Arabic numerals reaching Europe, earlier through translations of al-Khwarizmi); standard Arabic grammar rules for numbers (العدد والمعدود: gender agreement for 3–10, the accusative singular after 11–99, the dual مئتان/ألفان and مئتا ألف); the standard subtractive Roman numeral form (1–3999). Arabic words use مئة; the older spelling مائة is also correct.