Non-SI units accepted for use with SI

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The following units are not SI units but are "accepted for use with the International System."

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Non-SI units accepted for use with SI
Name Symbol Quantity Equivalent SI unit
minute min time 1 min = 60 s
hour h time 1 h = 60 min = 3600 s
day d time 1 d = 24 h = 1440 min = 86400 s
degree of arc ° angle 1° = (π/180) rad
minute of arc ′ angle 1′ = (1/60)° = (π/10800) rad
second of arc ″ angle ″ = (1/60)′ = (1/3600)° = (π/648000) rad
litre l or L volume 1dm3 = 0.001 m3
tonne t mass 1 t = 103 kg
Non-SI units not formally adopted by the CGPM
Name Symbol Quantity Equivalent SI unit
neper, field quantity Np ratio (dimensionless) LF = ln(F/F0) Np
neper, power quantity Np ratio (dimensionless) LP = ½ ln(P/P0) Np
bel, field quantity B ratio (dimensionless) LF = 2 log10(F/F0) B
bel, power quantity B ratio (dimensionless) LP = log10(P/P0) B
Non-SI units with values obtained only by experiment
Name Symbol Quantity Equivalent SI unit
electronvolt eV energy 1 eV = 1.60217733 (49) × 10−19 J
atomic mass unit u mass 1 u = 1.6605402 (10) × 10−27 kg
astronomical unit AU length 1 AU = 1.49597870691 (30) × 1011 m
Non-SI units whose use is not encouraged
Name Symbol Quantity Equivalent SI unit
nautical mile   length 1 nautical mile = 1852 m
knot   speed 1 knot = 1 nautical mile per hour = (1852/3600) m/s
are a area 1 a = 1 dam2 = 100 m2
hectare ha area 1 ha = 100 a = 10000 m2
bar bar pressure 1 bar = 105 Pa
Ångström, angstrom Å length 1 Å = 0.1 nm = 10−10 m
barn b area 1 b = 10−28 m2

Taylor, Barry N. (ed.) (2001). The International System of Units (SI) (2001 ed., Special Publication 330). Gaithersburg, Maryland: National Institute of Standards and Technology. pp. 15–19. Viewed at http://physics.nist.gov/Pubs/SP330/sp330.pdf

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