Systems of measurement

Current

General	International System of Units (SI) UK imperial system US customary units
Specific	Apothecaries' Avoirdupois Troy Astronomical Electrical English Engineering Units (US)
Natural	Hartree atomic Geometrised Lorentz–Heaviside Planck Quantum chromodynamical Stoney

Background

Metric	Overview Outline History Metrication
UK/US	Overview Comparison Foot–pound–second (FPS)

Historic

Metric	metre–kilogram–second (MKS) metre–tonne–second (MTS) centimetre–gram–second (CGS) gravitational
Europe	Byzantine Cornish Cypriot Czech Danish Dutch English Winchester Exchequer Estonian Finnish French Traditional Mesures usuelles German Greek Hungarian Icelandic Irish Italian Latvian Luxembourgian Maltese Norwegian Ottoman Polish Portuguese Romanian Russian Scottish Serbian Slovak Spanish Swedish Swiss Welsh
Asia	Afghan Cambodian Chinese Hong Kong Indian Indonesian Japanese Korean Mongolian Myanmar Nepalese Omani Philippine Pegu Singaporean Sri Lankan Syrian Taiwanese Tatar Thai Vietnamese
Africa	Algerian Ethiopian Egyptian Eritrean Guinean Libyan Malagasy Mauritian Moroccan Seychellois Somali South African Tunisian Tanzanian
North America	Costa Rican Cuban Haitian Honduran Mexican Nicaraguan Puerto Rican
South America	Argentine Bolivian Brazilian Chilean Colombian Paraguayan Peruvian Uruguayan Venezuelan

Ancient

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