About

This tool converts numeric values into standard Bahasa Indonesia text, a process known as Terbilang. It is essential for generating financial reports, invoices, receipts, and legal documents where ambiguity in figures must be eliminated. Unlike basic converters, this engine processes numbers as strings, allowing for high-precision conversion of values exceeding standard floating-point limits (e.g., quadrillions).

The algorithm correctly applies grammatical prefixes such as Se- (e.g., Seribu vs Satu Ribu) and handles the Indonesian scale system (Juta, Miliar, Triliun) strictly following linguistic standards. It also supports decimal reading for scientific contexts and currency formatting for banking needs.

Formulas

The conversion logic splits the integer N into groups of three digits (triads), starting from the least significant digit.

N = k∑i=0 G_i × 10³ⁱ

Where G_i is a triad (0-999) and 3i determines the scale suffix (Ribu, Juta, Miliar). For example:

1.234.567 → 1 (Juta) + 234 (Ribu) + 567

If a triad equals 1 and is in the thousands position (i=1), the prefix Se- is applied (Seribu) instead of Satu.

Reference Data

Number (n)	Bahasa Indonesia	Scale (Power of 10)
0	Nol	10⁰
1	Satu	10⁰
10	Sepuluh	10¹
11	Sebelas	10¹
100	Seratus	10²
1.000	Seribu	10³ (Ribu)
1.000.000	Satu Juta	10⁶ (Juta)
10⁹	Satu Miliar	10⁹ (Miliar)
10¹²	Satu Triliun	10¹² (Triliun)
10¹⁵	Satu Kuadriliun	10¹⁵

Frequently Asked Questions

In formal Bahasa Indonesia grammar, the number 1000 acts as a single unit when used as a quantity, taking the prefix "Se-". However, for numbers like 21,000, it becomes "Dua puluh satu ribu". The tool automatically detects this grammatical rule.

This tool uses custom string parsing rather than standard JavaScript numbers, allowing it to handle integers with up to 66 digits (Vigintillion scale), far exceeding the 15-digit limit of standard calculators.

Yes. Decimals are read digit-by-digit after the word "koma" (comma), which is the standard method for non-currency values. For example, 0.5 is "Nol koma lima".

The standard spelling according to the Great Dictionary of the Indonesian Language (KBBI) is "Miliar". This tool uses the official KBBI standard.

Yes. Toggle the "Currency Mode" to automatically append "Rupiah" and format the text appropriate for financial instruments like checks or receipts.