# SI Units

SI Base and Derived units with Prefixes

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The SI units of measurement are based on seven quantities, other commonly used quantities are derived from these.

SI Base units:

Base Quantity Base Unit Base Symbol
Length Meter m
Time Second s
Mass Kilogram kg
Temperature Kelvin K
Electric current Ampere A
Luminous intensity Candela cd
Amount of substance Mole Mol

SI derived units:

Derived quantity Derived unit Derived symbol
Area square meter [m2]
Volume cubic meter [m3]
acceleration meter per second squared [m/s2]
Speed, velocity meter per second [m/s]
wave number reciprocal meter [m-1]
mass density kilogram per cubic meter [kg/m3]
specific volume cubic meter per kilogram v [kg/m3]
current density ampere per square meter [A/m2]
magnetic field strength ampere per meter [A/m]
amount of substance concentration mol per cubic meter [mol/m3]
luminance caldela per square meter [cd/m2]
mass fraction kilogram per kilogram [kg/kg]
Frequency Hertz f [Hz]
Force Newton N
Energy, Work Joule J
Electric charge Coulomb C
Power Watt W [J/s]
Potential difference volt V or U
Electrical resistance Ohm Ω
Magnetic flux Weber Wb [V.s]
Magnetic flux density Tesla T [Wb/m2]
Inductance Henry H
Pressure Pascal Pa [N/m2]
Dynamic viscosity Pascal second µ [Pa·s]
Moment of force Newton meter [N·m]
Surface tension Newton per meter [N/m]
Heat flux density, irradiance Watt per square meter [W/m2]
Entropy Joule per kelvin S [J/K]
Specific heat capacity, specific entropy Joule per kilogram kelvin cp [J/(kg·K)]
Specific energy Joule per kilogram J/kg
Thermal conductivity Watt per meter kelvin K [W/(m·K)]
Energy density Joule per cubic meter [J/m3]
Electric field strength Volt per meter [V/m]
Electric charge density Coulomb per cubic meter [C/m3]
Electric flux density Coulomb per square meter [C/m2]
Molar energy Joule per mole [J/mol]
Molar entropy Joule per mole Kelvin [J/(mol·K)]
Absorbed dose rate Gray per second [Gy/s]
catalytic concentration katal per cubic meter [kat/m3]

SI Unit prefixes

Name Multiplier Prefix Power of 10
Tera 1,000,000,000,000 T 1 x 1012
Giga 1,000,000,000 G 1 x 109
Mega 1,000,000 M 1 x 106
Kilo 1,000 k 1 x 103
Unit 1
Milli 0.001 m 1 x 10-3
Micro 0.000,001 µ 1 x 10-6
Value-1 Value-2 η 1 x 10-9
Value-1 Value-2 ρ 1 x 10-12

SI Base units: Table as image for offline viewing

SI Unit prefixes: Table as image for offline viewing

SI derived units:Table as image for offline viewing

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