Complete Guide to Cambodian Riel (KHR) & Khmer Numerals

Khmer numerals hold a revered position in the history of mathematics worldwide. Archaeological inscriptions, notably Stele K. 127 discovered at Trapang Prei in Kratié Province dating back to 683 CE, contain what mathematicians and epigraphers recognize as the earliest recorded epigraphic zero in human civilization. The numerals from ០ to ៩ represent centuries of linguistic continuity that form the backbone of modern Cambodian commerce, administration, and cultural identity.

Every Western Arabic digit directly maps to an authentic Khmer Unicode glyph in the range U+17E0 through U+17E9: • 0 -> ០ (soun / សូន្យ) • 1 -> ១ (mouy / មួយ) • 2 -> ២ (pi / ពីរ) • 3 -> ៣ (bei / បី) • 4 -> ៤ (buon / បួន) • 5 -> ៥ (pram / ប្រាំ) • 6 -> ៦ (pram mouy / ប្រាំមួយ) • 7 -> ៧ (pram pi / ប្រាំពីរ) • 8 -> ៨ (pram bei / ប្រាំបី) • 9 -> ៩ (pram buon / ប្រាំបួន) Notice that Khmer counting operates on a biquinary (base-5 / base-10 hybrid) linguistic architecture, where numbers from 6 through 9 are literally formed by combining "5" with digits 1 through 4.

In contrast to English which groups digits strictly in powers of thousands (thousand, million, billion), Cambodian utilizes unique historical unit markers for distinct multiples: • ដប់ (Dop) = 10 • រយ (Roy) = 100 • ពាន់ (Poan) = 1,000 • ម៉ឺន (Meun) = 10,000 • សែន (Saen) = 100,000 • លាន (Lean) = 1,000,000 • កោដិ (Kaot) = 10,000,000 Understanding these scales is fundamental when generating legal contracts, accounting ledgers, and banking documentation across Cambodia.

The National Bank of Cambodia (NBC) administers the Cambodian Riel, denoted by the Unicode currency symbol ៛ (U+17DB). Official bank checks, formal invoices, and tax declarations issued in Cambodia mandate written amounts spelled out in full Khmer words alongside numeric values. This eliminates fraud and prevents typographic ambiguity in legal dispute resolutions.