Greek numerals.

Worked example

For 2019: 2000 is the unit letter β (2) with the lower mark ͵ before it, 10 is ι and 9 is θ, so the numeral is ͵ΒΙΘʹ. For 2026 the six is written with stigma: ͵ΒΚϚʹ (or ͵ΒΚΣΤʹ). The closing mark ʹ (keraia) shows that the letters are a number.

How it works

In the alphabetic (Milesian) system each letter has a fixed value: α to θ are 1 to 9, ι to ϟ are 10 to 90, and ρ to ϡ are 100 to 900. The letters for 6, 90 and 900 are the archaic stigma/digamma (ϛ), koppa (ϟ) and sampi (ϡ), kept for numerals after they left the everyday alphabet. Stigma is also written as the letter pair ΣΤ in modern use.

Numbers are written highest value first and closed with the keraia ʹ (U+0374). Thousands reuse the unit letters with the lower left keraia ͵ (U+0375) before them: ͵α is 1000 and ͵θ is 9000. This tool covers 1 to 9999 and does not attempt the myriad (10,000) notation.

When reading a numeral back, the letters must be in standard order (thousands, hundreds, tens, units); anything else is rejected rather than guessed. Alternative forms of 6, 90 and 900 (digamma, archaic koppa, archaic sampi) are accepted as input.

Sources and basis (opened 2026-10-15): Greek numerals - Wikipedia (letter values, stigma/koppa/sampi, keraia U+0374, lower numeral sign U+0375 and the example 2019 = ͵ΒΙΘʹ).

FAQ

How do you write 2026 in Greek numerals?

͵ΒΚϚʹ: 2000 (͵Β), 20 (Κ) and 6 (Ϛ), closed with the keraia. The six can also be written ΣΤ.

What are stigma, koppa and sampi?

Archaic letters retained as numerals: stigma (ϛ) is 6, koppa (ϟ) is 90 and sampi (ϡ) is 900.

What does the mark after the letters mean?

The keraia (ʹ) shows that the letters are a number, not a word.

How are thousands written?

With the unit letter preceded by a lower left keraia: ͵α is 1000, ͵β is 2000.

How large a number can this convert?

1 to 9999. Larger numbers used a separate myriad notation that this tool does not cover.