Units and Conversions

The following tables of units and conversions are useful for reference. A PDF file of this information can be downloaded here.

1.1 Commonly used mechanical units

Heading 1 Heading 2 Heading 3 Heading 4
Cell 1 Cell 2 Cell 3 Cell 4
Long Cell Long Cell Long Cell Long Cell Long Cell Long Cell Long Cell Long Cell Long Cell Long Cell Long Cell Long Cell Long Cell Long Cell Long Cell Long Cell Long Cell Long Cell 5 Cell 6

Cell 7

button

 Cell 8
Cell 9 Cell 10 Cell 11 Cell 12

1.2 Mechanical quantities, fundamental units of dimensions MLT (mass, length, time) and their SI units

Quantity
Dimensions
Units
Acceleration
LT−2
Metre/second2
Angle
Radian
Angular acceleration
T−2
Radian/second2
Angular momentum
ML2T−1
Kilogram-metre2/second
Angular velocity
T−1
Radian/second
Area
L2
Metre2
Energy
ML2T−2
Joule
Force
MLT−2
Newton
Frequency
T−1
Cycle/second (Hertz)
Gravitational field strength
LT−2
Newton/kilogram
Mass density
ML−3
Kilogram/metre2
Momentum
MLT−1
Kilogram-metre/second
Power
ML2T−3
Watt
Pressure
ML−1$T^{-2}$
Newton/metre2
Torque
ML2T−2
Newton/metre
Velocity
LT−1
Metre/second
Work
ML2T−2
Joule

1.3 Multiples and sub-multiples of SI units

Prefix Symbol Equivalent
exa E 1018
peta P 1015
tera T 1012
giga G 109
mega M 106
kilo k 103
hecto h 102
deca da 10
deci d 10−1
centi c 10−2
milli m 10−3
micro μ 10−6
nano n 10−9
pico p 10−12
femto f 10−15
atto a 10−18

Additional Resources