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Publication #SS-AGR-27

Conversion Factors1

F.M. Fishel, J.A. Ferrell, and G. E. MacDonald2

Mass (Weights)

1 U.S. ton = 2,000 lbs = 0.97 metric tons
1 lb = 16 oz = 453.6 g = 0.4356 kg
1 oz = 28.35 g

Area

1 sq mile = 640 A
1/4 mi x 1/4 mi = 40 A
1,320 ft x 1,320 ft = 40A
1 A = 43,560 sq ft = 0.405 ha
1 ha = 2.47A = 10,000 m2
1 yd2 = 9 ft2 = 0.836 m2
1 ft2 = 144 in2 = 0.09 m2
1 cm2 = 0.155 in2
#A = [length (ft) x width (ft)] ÷ 43,560 ft2

Velocity

1 mph = 5,280 ft/hr = 88 ft/min = 1.467 ft/sec
1 m/sec = 196.85 ft/min = 2.24 mph
1 m/sec = 1.942 knots

Pressure

1 atm = 14.7 psi = 406.8 inches H2O @ 40 °F
1 atm = 29.92 inches Hg @ 40 °F = 760 mm Hg @ 4 °C
1 atm = 1.01325 bar
1 psi = 27.68 inches H2O @ 40 °F = 144 lb/ft2 = 703.06 kg/m2 @ 4 °C
1 psi = 6.8948 x 103 pascals = 6.895 Kpa = 2.036 inches Hg
1 psi = 70.3 g per cm2
1 pascal = 10 dynes/cm2 = 1.45 x 10-4 psi

Temperature

°F = (9/5 °C) + 32
°C = 5/9 (°F-32)
°K = °C + 273.16
°R = °F + 459.69

Length

1 mi = 5,280 ft = 1.6093 km
1 yd = 3 ft = 36 in = 91.44 cm
1 ft = 12 in = 30.48 cm
1 in = 2.54 cm

Liquid

1 gal = 231 in3 = 4 qt = 8 pt = 16 C = 8.4 lb (water)
1 qt = 2 pt = 4 C = 32 fl oz = 0.946 L = 946 ml
1 pt = 2 C = 16 fl oz = 0.473 L = 473 ml = 32 tbsp
1 C = 8 oz = 0.24 L = 240 ml = 0.5 pt = 16 tbsp
1 fl oz = 2 tbsp = 6 tsp = 1.8 in3 = 0.02957 L = 29.57 ml
1 tbsp = 3 tsp = 0.5 oz = 14.78 ml
1 tsp = 0.166 oz = 4.92 ml
1 ml = 0.0338 fl oz = 1 cc

Commodity Weights

1 bu barley = 48 lbs
1 bu corn = 56 lbs
1 bu cotton = 32 lbs
1 bu cotton bale = 480 lbs
1 bu cowpeas = 60 lbs
1 bu crimson clover = 60 lbs
1 bu oat and fescue = 32 lbs
1 bu rye = 56 lbs
1 bu sorghum, forage = 50 lbs
1 bu sorghum, grain = 56 lbs
1 bu soybeans = 60 lbs

Abbreviations (in alphabetical order)

A = acre
atm = atmospheres
bu = bushel
C = cups
°C = Degrees Celcius
cc = cubic centimeters
cm = centimeter
cm2 = square centimeters
°F = Degrees Fahrenheit
fl oz = fluid ounces
ft = foot
ft2 = square feet
g = gram
gal = gallon
ha = hectare
Hg = mercury
hr = hour
in = inch
in2 = square inches
in3 = cubic inches
°K = Degrees Kelvin
kg = kilogram
km = kilometer
Kpa = kilopascals
L = liter
lb = pound
m = meter
m2 = square meters
mi = mile
min = minute
ml = milliliter
mm = millimeter
mph = miles per hour
oz = ounce
psi = pounds per square inch
pt = pint
qt = quart
°R = Degrees Rankin
sec = second
sq = square
tbsp = tablespoon
tsp = teaspoon
yd = yard
yd2 = square yards

Footnotes

1.

This document is SS-AGR-27, one of a series of the Agronomy Department, UF/IFAS Extension. Reviewed November 2006. Revised November 2007. Reviewed August 2013. Please visit the EDIS website at http://edis.ifas.ufl.edu.

2.

F.M. Fishel, professor, Agronomy Department and director, Pesticide Information Office; J.A. Ferrell, assistant professor, Agronomy Department; G. E. MacDonald, associate professor, Agronomy Department; J. Tredaway Ducar, former assistant professor, Agronomy Department; UF/IFAS Extension, Gainesville, FL 32611.


The Institute of Food and Agricultural Sciences (IFAS) is an Equal Opportunity Institution authorized to provide research, educational information and other services only to individuals and institutions that function with non-discrimination with respect to race, creed, color, religion, age, disability, sex, sexual orientation, marital status, national origin, political opinions or affiliations. For more information on obtaining other UF/IFAS Extension publications, contact your county's UF/IFAS Extension office.

U.S. Department of Agriculture, UF/IFAS Extension Service, University of Florida, IFAS, Florida A & M University Cooperative Extension Program, and Boards of County Commissioners Cooperating. Nick T. Place, dean for UF/IFAS Extension.