Collection

40 numeral and counting systems, from ancient traditions to modern computing.

40 traditions

40 converters · Each entry shows its supported range.

Babylonian sexagesimal

Bamum

Binary

Brahmi

Decimal sign values

Chinese counting rods

Choctaw

Decimal number words

Cistercian

Four decimal quadrants

Cistercian Numerical Gestures

Finger totals · hours 1–10

Coptic epact

Decimal sign-values

dízdiin dóó bi’aan naaki

Diné / Navajo

Decimal number words

Egyptian hieroglyphic

Ethiopic

Greek alphabetic

Greek Attic

Acrophonic · groups of 5

kanalima-kūmā-ono

Hawaiian

Decimal words · named tens

Hexadecimal

Inka khipu

Decimal knot positions

Kaktovik Iñupiaq

Base 20 · groups of 5

Kharoshthi

Decimal, with groups of 20

Mangarevan

Decimal with binary steps

rima tekau mā ono

Māori

Decimal number words

Maya

Medefaidrin

Medieval European Finger Counting

Decimal · four finger groups

Mende Kikakui

Decimal units & multipliers

Mexica / Aztec

N’Ko

Base 10 · right to left

14 · nose · center

Oksapmin body counting

27 body positions

Old Persian

Decimal sign values

Osmanya

Ottoman Siyaq

Phoenician

Decimal tallies

Roman

Additive · subtractive

Rumi

Decimal sign-values

Sequoyah’s Cherokee numerals

Distinct signs & additive tens

Sinhala Illakkam

Decimal with multipliers

Suzhou

Traditional Tamil

Decimal, named powers

Vai

ẹ̀rin dílọgọ́ta

Yorùbá

Twenties · addition & subtraction