Knowledge Centre

ISWM Weights and Measures Tables

AVOIRDUPOIS OR COMMERCIAL WEIGHT
1 gross or long ton (l. tn.) = 2240 pounds
1 net or short ton (sh. tn.) = 2000 pounds
1 long hundred weight (l. cwt.) = 112 pounds
1 short hundred weight (sh. cwt.) = 100 pounds
1 pound (lb.) = 16 ounces (oz.) = 7000 grains (gr.)
1 ounce (oz.) = 16 drams (dr.) = 437.5 grains
APOTHECARIES’ WEIGHT
1 pound (lb. ap.) = 12 ounces = 5760 grains
1 ounce (oz. ap.) = 8 drams = 480 grains
1 dram (dr. ap.) = 3 scruples = 60 grains
1 scruple (s. ap.) = 20 grains
METRIC EQUIVALENTS AVOIRDUPOIS OR COMMERCIAL WEIGHT
1 long ton = 1.016 metric ton = 1016 kilograms
1 short tun = 0.9072 metric ton = 907.2 kilograms
1 pound av. = 0.4356 kilograms = 453.6 grams
1 ounce av. = 28.35 grams (g)
1 grain (gr.) = 0.0648 gram (g)
TROY WEIGHT
1 pound (lb. t.) = 12 ounces = 5760 grains
1 ounce (oz. t.) = 20 pennyweights = 480 grains
1 pennyweight (dwt.) = 24 grains
METRIC WEIGHT
1 metric ton (t) = 1000 kilograms
1 kilogram (or kilo) (kg) = 1000 grams = 10 hectograms
1 hectogram (hg) = 100 grams = 10 dekagrams
1 dekagram (dkg) = 10 grams
1 gram (g) = 10 decigrams
1 decigram (dg) = 10 centigrams
1 centigram (cg) = 10 milligrams (mg)
AVOIRDUPOIS EQUIVALENTS OF METRIC WEIGHT
1 ton (metric) = 0.9842 long ton = 2204.6 pounds av.
1 ton (metric) = 1.1023 short ton = 2204.6 pounds av.
1 kilogram = 2.2046 pounds av. = 35.274 ounces av.
1 gram = 0.03527 ounces av.
1 gram = 15.432 grains
TROY AND APOTHECARIES’ WEIGHTS EQUIVALENTS IN AVOIRDUPOIS AND METRIC WEIGHT
1 pound Troy or apothecaries’ = 0.82286 pounds avoirdupois = 373.2 grams
1 ounce Troy or apothecaries’ = 1.09714 ounce avoirdupois = 31.103 grams
1 grain Troy or apothecaries’ = 1 grain avoirdupois = 0.0648 gram
1 pound avoirsupois = 1.21528 pound Troy or apothecaries’
1 kilogram (kg) = 0.911458 ounce Troy or apothecaries’
1 gram (g) = 0.0322 ounce Troy or apothecaries’
MEASURES OF LENGTH
1 mile (mi.) = 1760 yards = 5280 feet = 1.609 kilometers
1 yard (yd.) = 3 feet = 36 inches = 0.9144 meter
1 foot (ft.) = 12 inches = 304.8 millimeters
1 inch (in.) = 25.4 millimeters
1 kilometer (km) = 1000 meter
1 meter (m) = 10 decimeter = 3.2808 feet = 39.37 inches
1 decimeter (dm) = 10 centimeter = 3.937 inches
1 centimeter (cm) = 10 millimeter (mm) = 0.3937 inches
FLUID POWER EQUIVALENTS / EXACT EQUIVALENTS
1 U.S. gallon = 231 cubic inches
= 4 quarts or 8 pints
= 128 ounces (liquid)
= 133.37 ounces (weight)
= 8.3356 pounds
= 3.785 liters
 1 imperial gallon = 1.2 U.S. gallons
 1 Liter = 0.2642 U.S. gallons
 1 cubic foot = 7.48 gallons
= 1728 cubic inches
= 62.4 pounds (water)
= 760 mm Hg
1 Cu. ft. water = 62.4 pounds
1 Bar at sea level = 14.504 PSI
Approx. 1/2 PSI decrease each 1000 foot of elevation
1 “Hg = 0.490 PSI
= 1.131 ft. water
 1 horsepower = 33,000 ft. lbs. per minute
= 550 ft. lbs. per second
= 42.4 BTU per minute
= 2545 BTU per hour
= 746 watts or 0.746 kw
 1 PSI = 2.0416 “Hg
= 27.72 ” water
= 27.71 bar
 1 Atmosphere = 1.013 bars
= 29.921 “Hg
= 14.696 PSI
= 760 mm Hg
 1 Foot water column = 0.432 PSI
1 Foot oil column = 0.354 PSI
 1 Barrel oil = 42 gallons
 1 Micro-meter (micron) = 0.000001 meter
= 0.001 centimeter
= 0.00004 inch
25 Micro-meters = 0.001 inch
FLUID POWER EQUIVALENTS / APPROXIMATE EQUIVALENTS
1 Pint = 2 cups
2 cups = 32 tablespoons
32 tablespoons = 96 teaspoons
96 teaspoons = 16 fluid ounces
16 fluid ounces = 1 lb.
1 Quart = 4 cups
4 cups = 2 pints
2 pints = 32 fluid ounces
32 fluid ounces = 2 pounds
1 Gallon = 16 cups
16 cups = 4 quarts
4 quarts = 8 pints
8 pints = 128 fluid ounces
128 fluid ounces = 231 cubic inches
1 Cup = 16 tablespoons
16 tablespoons = 48 teaspoons
1 Tablespoon = 3 tsp.
3 tsp. = 1/2 fluid ounce
1 Fluid oz. (volume) = 600 drops hydraulic oil
1 Cubic inch = 330 drops (oil)
FLUID POWER ABBREVIATIONS
 abs absolute (as in psia)
 A-C alternating current
 Bhn Brinell hardness number
 Btu British thermal unit
 C degrees Centigrade (Celsius)
 cc closed center
 ccw counter clockwise
 cfm cubic feet per minute
 cfs cubic feet per second
 cir cubic inches per revolution
 cim cubic inches per minute
 com common
 cpm cycles per minute
 cps cycles per second
 cu.in/rev cubic inches per revolution
 cw clockwise
 cyl cylinder
 dia diameter
 ext external
 F degrees Farenheit
 fl fluid
 fpm feet per minute
 ft foot
 ft-lb foot pound
gal gallon
 gpm gallons per minute
 Hg Mercury
 HP horsepower
 Hz Hertz
 ID inside diameter
 in inch
 in-lb inch pound
 int internal
 ipm inches per minute
 ips inches per second
 lb pound
 max maximum
 min minimum
 mtd mounted
 NC normally closed
 NO normally open
 NPT national pipe thread
 NPTF dryseal pipe threads
 oc open center
 oz ounce
 P.O. pilot operated
 press pressure
 psi pounds per square inch
 psia psi absolute
 psig psi gauge
 pt pint
 qt quart
 r radius
 rms root mean square
 rpm revolutions per minute
 rps revolutions per second
 scfm standard cu. ft. per minute
 Smls seamless
 sol solenoid
 SSU Saybolt seconds universal
 SUS Saybolt universal seconds
 u micro-meters or microns
 T torque
 vac vacuum
 VI viscosity index
 visc viscosity

 

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