Appendix
84
15.2 Conversion table
The following table facilitates the conversion of specific units
Size
SI units (metric)
Factor
Imperial units
Unit name
Abbreviation
Unit name
Abbreviation
Area
Hectare
ha
2.47105
Acre
acres
Volume flow
rate
Litres per
minute
l/min
0.2642
US gallons
per minute
gpm
Cubic metres
per hour
m³/h
4.4029
Force
Newton
N
0.2248
Pound-force
lbf
Length
Millimetre
mm
0.03937
Inch
in.
Metre
m
3.2808
Foot
ft.
Power
Kilowatt
kW
1.3410
Horse power
hp
Pressure
Kilopascal
kPa
0.1450
Pounds per
square inch
psi
Megapascal
MPa
145.0377
Bar (non-SI)
bar
14.5038
Torque
Newton metre
Nm
0.7376
Pound-foot
or foot-pound
ft∙lbf
8.8507
Pound-inch
or inch-pound
n∙lbf
Temperature
Degrees
Celsius
°C
°C x 1.8 + 32
Degrees
Fahrenheit
°F
Speed
Metres per
minute
m/min
3.2808
Feet per
minute
ft/min
Metres per
second
m/s
3.2808
Feet per
second
ft/s
Kilometres per
hour
km/h
0.6215
Miles per
hour
mph
Volume
Litre
L
0.2642
US gallon
US gal.
Millilitre
ml
0.0338
US ounce
US oz.
Cubic
centimetre
cm³
0.0610
Cubic inch
in³
Weight
Kilogramme
kg
2.2046
Pound
lbs