US Units of Measurement


 

Units of Length
   
12 inches (in) = 1 foot (ft)
3 feet = 1 yard (yd)
16-1/2 feet = 1 rod (rd), pole, or perch
40 rods = 1 furlong (fur) = 660 feet
8 furlongs = 1 U.S. statute mile (mi) = 5280 feet
1852 meters = 6076.115 49 feet (approximately)
  = 1 international nautical mile

 

Units of Area3
   
144 square inches (in2) = 1 square foot (ft2)
9 square feet = 1 square yard (yd2,)
  = 1296 square inches
272-1/4 square feet = 1 square rod (sq rd)
160 square rods = 1 acre = 43 560 square feet
640 acre = 1 square mile (mi2)
1 mile square = 1 section of land
6 miles square = 1 township
  = 36 sections = 36 square miles

 

Units of Volume3
   
1728 cubic inches (in3) = 1 cubic foot (ft3)
27 cubic feet = 1 cubic yard (yd3)

 

Gunter's or Surveyors Chain Units of Measurement
   
0.66 foot (ft) = 1 link (li)
100 links = 1 chain (ch)
  = 4 rods = 66 feet
80 chains = 1 U.S. statute mile (mi)
  = 320 rods = 5280 feet

 

Units of Liquid Volume4
   
4 gills (gi) = 1 pint (pt)= 28.875 cubic inches
2 pints = 1 quart (qt) = 57.75 cubic inches
4 quarts = 1 gallon (gal) = 231 cubic inches
  = 8 pints = 32 gills

 

Apothecaries Units of Liquid Volume
   
60 minims (min or ) = 1 fluid dram (fl dr or f)
  = 0.225 6 cubic inch
8 fluid drams = 1 fluid ounce (fl oz or f)
  = 1.804 7 cubic inches
16 fluid ounces = 1 pint (pt or )
  = 28.875 cubic inches
  = 128 fluid drams
2 pints = 1 quart (qt) = 57.75 cubic inches
  = 32 fluid ounces = 256 fluid drams
4 quarts = 1 gallon (gal) = 231 cubic inches
  = 128 fluid ounces = 1024 fluid drams

 

Units of Dry Volume5
   
2 pints (pt) = 1 quart (qt) = 67.200 6 cubic inches
8 quarts = 1 peck (pk) = 537.605 cubic inches
  = 16 pints
4 pecks = 1 bushel (bu) = 2150.42 cubic inches
  = 32 quarts

 

Avoirdupois Units of Mass6
 
[The "grain" is the same in avoirdupois, troy, and apothecaries units of mass.]
 
27-11/32 grains = 1 dram (dr)
16 drams = 1 ounce (oz)
  = 437-1/2 grains
16 ounces = 1 pound (lb)
  = 256 drams
  = 7000 grains
100 pounds = 1 hundredweight (cwt)7
20 hundredweights = 1 ton
  = 2000 pounds7

 

In "gross" or "long" measure, the following values are recognized:
   
112 pounds = 1 gross or long hundredweight7
20 gross or long hundredweights = 1 gross or long ton
  = 2240 pounds7

 

Troy Units of Mass
 
[The "grain" is the same in avoirdupois, troy, and apothecaries units of mass.]
   
24 grains = 1 pennyweight (dwt)
20 pennyweights = 1 ounce troy (oz t)= 480 grains
12 ounces troy = 1 pound troy (lb t)
  = 240 pennyweights = 5760 grains

 

Apothecaries Units of Mass
 
[The "grain" is the same in avoirdupois, troy, and apothecaries units of mass.]
   
20 grains = 1 scruple (s ap or )
3 scruples = 1 dram apothe-caries (dr ap or )
  = 60 grains
8 drams apothecaries = 1 ounce apothecaries (oz ap or )
  = 24 scruples = 480 grains
12 ounces apothecaries = 1 pound apothecaries (lb ap)
  = 96 drams apothecaries
  = 288 scruples = 5760 grains