Depends On How You Measure It.

Standard Measurements

Length (linear measure)

1 foot = 12 inches
1 yard = 3 feet
1 rod = 16 1/2 feet
1 mile = 5,280 feet
1 mile = 1,760 yards
1 mile = 320 rods
1 knot = 1.516 miles
1 mile = .8684 knots

Surface (area)

1 square foot = 144 square inches
1 square yard = 9 square feet
1 square rod = 30 1/4 square yards
1 square rod = 272 1/2 square feet
1 acre = 160 square rods
1 acre = 1 rod wide & 1/2 mile long
1 acre = 43,560 square feet
1 square acre = 208.71 feet wide & 208.71 feet long
1/2 square acre = 147.58 feet wide & 147.58 feet long
1/4 square acre = 104.355 feet wide & 104.355 feet long
1 circular acre = 235.504 feet in diameter

U.S. government land measures

1 township = 36 sections
1 section = 640 acres
1 section = 1 square mile
1 quarter section = 160 acres
1 quarter section = 1/2 mile long & 1/2 mile wide
1 eighth section = 80 acres
1 eighth section = 1/2 mile long & 1/4 mile wide
1 sixteenth section = 40 acres
1 sixteenth section = 1/4 mile long & 1/4 mile wide

Surveyor’s measure

1 link = 7.92 inches
1 rod = 25 links
1 chain = 66 feet
1 acre = 10 square chains
1 mile = 80 chains

Cubic measure (volume)

1 cubic foot = 1,728 cubic inches
1 cubic yard = 27 cubic feet
1 board ft. = 1" x 12" x 12" nominal dimensions
1 cord (wood) = 128 cubic feet
1 bushel grain or shelled corn = 1.25 cubic feet
1 cubic foot grain or shelled corn = .8 bushels
1 bushel ear corn = 2 1/2 cubic feet
1 cubic foot ear corn = .4 bushels
1 cubic yard concrete = 81 sq. ft.—4" floor
1 cubic yard concrete = 54 sq. ft.—6" floor

Calculations

Diameter of a circle = circumference x .31831
Circumference of a circle = diameter x 3.1416
Area of a circle = diatmeter x diameter x .7854
Surface of a ball = diameter x diameter x 3.1416
Doubling the diameter of a pipe increases it's capacity 4 times

Dry measure

1 quart = 2 pints
1 peck = 8 quarts
1 bushel = 4 pecks
1 chaldron = 36 bushels

Liquid measure

1 pint = 2 cups
1 pint = 16 fluid ounces
1 quart = 2 pints
1 quart = 32 fluid ounces
1 gallon= 4 quarts
1 gallon = 128 ounces
1 gallon = .1337 cubic feet
1 cubic foot = 7.48 gallons
1 gallon = 231 cubic inches
1 barrel = 32 1/2 gallons
1 US gallon = .8327 imperial gallons (British)
1 imperial gallon (British) = 1.201 U.S. gallons
1 gallon water (20° C)= 8.33 pounds
1 foot of water (4° C) = .4335 pounds per sq. inch
1 pound per sq. inch = 2.307 feet of water (4° C)
1 cubic foot = 62.427 pounds of water (4° C)
1 gallon = 8.33 pounds of water (4° C)
1 teaspoon = .17 fluid ounes (1/6 oz.)
1 tablespoon (1/2 oz.) = 3 teaspoons (level)
1 fluid ounce = 2 tablespoons
1 cup (liquid) = 16 tablespoons (8 oz.)

Apothecaries’ weight

1 scruple = 20 grains
1 dram = 3 scruples
1 ounce = 8 drams
1 pound = 12 ounces
1 dram = 27 11/32 grains

Avoirdupois weight

1 pound = 16 ounces
1 ton (short) = 2,000 pounds
1 ton (long) = 2,240 pounds

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