Standard symbols and abbreviations
+ -
o
amp Btu C cal cal cm cos cu. cm, cc cu. in cu. ft cu. m dB deg ESHP
F F ft ft-lb(s) g gal HP hr Hz in in hg IPS k K kg kHz km kW kW-hr l lb positive negative ohm degree inch(es) foot (feet) ampere British thermal unit Celsius calorie(s) large calorie(s) centimetre cosine cubic centimetre(s) cubic inch(es) cubic foot (feet) cubic metre(s) decibel degree equivalent shaft
horsepower farad Fahrenheit foot (feet) foot-pound(s) gram gallon horsepower hour hertz inch(es) inch(es) of mercury inches per second kilo kelvin kilogram kilohertz kilometre kilowatt kilowatt hour litre pound m metre

mb millibar
mf, .f microfarad
mHz millihertz
MHz megahertz
mi mile(s)
mm millimetre
MPH miles per hour
mv millivolt
neg negative
oz ounce(s)
pf, ..f picofarad
pos positive
PPH pounds per hour
PPM parts per million
PSI pounds per square inch
PSIA pounds per square inchabsolute pressure
PSID pounds per square inchdifferential pressure
PSIG pounds per squareinch gage
pt pint
qt quart
R Rankine
rev. revolution(s)
rpm, r.p.m. revolutions per minute
sec. second
SHP shaft horsepower
sin sine
sq. cm, cm2 square centimetre(s)
sq. in square inch(es)
sq. ft square foot (feet)
sq. m, m2 square metre
sq. mi square mile(s)
sq. mil square mil
tan tangent
TEHP total equivalent
horsepower

THP total horsepower
V volt
yd(s) yard(s)

Weights and Measures: Metric Measures
Length
1 millimetre (mm) 1 centimetre (cm) 1 decimetre (dm) 1 metre (m) 1 kilometre (km)

Area
1 square millimetre (mm2)
1 square centimetre (cm2)
1 square metre (m2)
1 are (a)
1 hectare (ha)
1 square kilometre (km2)

Weight
1 milligram (mg) 1 gram (g) 1 kilogram (kg) 1 tonne (t)

Volume
1 cubic centimetre (cm3) 1 cubic decimetre (dm3) 1 cubic metre (m3)

Liquid Volume
1 litre (l) 1 hectolitre (hl) = 10 mm = 10 cm = 100 cm = 1000 m
= l00 mm2 = l0,000 cm2 = 100 m2 = 100 ares = 100 hectares
= 1000 mg = 1000 g = 1000 kg

= 1000 cm3 = 1000 dm3
= 1 dm3 = 100 l = 0.0394 in = 0.3937 in = 3.937 in = 1.0936 yds = 0.6214 mile
= 0.0016 sq. in. = 0.155 sq. in = 1.196 sq. yds = 119.6 sq. yds = 2.4711 acres = 0.3861 sq. mile
= 0.0154 grain = 0.0353 oz = 2.2046 lb = 0.9842 ton
= 0.061 cu. in = 0.0351 cu. ft = 1.308 cu. yds
= 1.76 pt = 22 gal

Weights and Measures: Imperial Measures Conversion factors: Imperial to Metric
Length 
1 inch (in)  = 2.54 cm 
1 foot (ft)  = 12 in  = 0.3048 m 
1 yard (yd)  = 3 ft  = 0.9144 m 
1 rod (rd)  = 5.5 yds  = 4.0292 m