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Length
Inch = 1/12 or 0.083 foot = 2.54 centimeters = 25.4          millimeters

Foot= 12 inches =0.3048 meters = 30.48 centimeters

Yard= 36 inches = 3 feet = 0.9144 meters

Rod = 16.5 feet = 5.5 yards = 5.03 meters

Furlong = 22 yards

Mile = 1,700 yards = 5,380 feet = 1.61 kilometers = 8             furlongs =  80 chains
Area
Square Inch = 0.007 sq feet = 6.45 sq centimeters

Square Foot = 144 sq inches = 929.03 sq centimeters

Square Yard = 9 sq feet = 0.836 sq meters

Square Rod = 30.25 sq yards
Acre = 4,840 sq yards = 43,560 sq feet = 160 sq rods =             4.047 sq meters = 0.405 hectare

Hectare = 10,000 sq meters = 2.47 acres

Square Mile = 640 acres = 2.59 sq kilometers = 1                        section

Section = 1 sq mile = 640 acres = 2.59 sq kilometers
Liquid Measures
Teaspoon = 0.1667 fluid ounce = 80 drops = 4.93                     milliliters

Tablespoon = 3 teaspoons = 0.5 fluid ounce = 14.8                     milliliters

Fluid Ounce = 2 tablespoons = 29.58 milliliters

Cup = 8 fluid ounces = 16 tablespoons = 236.6            milliliters

Pint = 2 cups = 16 fluid ounces = 473.3 milliliters

Quart = 4 cups = 2 pints = 32 fluid ounces = 0.946                liters

Liter = 2.113 pints = 1,000 milliliters = 1.057 quarts

Gallon = 4 quarts = 8 pints = 128 fluid ounces = 3.785                 liters

Cubic Foot of Water = 7.5 gallons = 62.4 pounds = 28.3                                        liters

Acre Inch of Water = 27,154 gallons = 3,630 cubic feet
Dry Measures
Teaspoon (level) = 0.35 cubic inch = 5.74 cubic centimeters

Tablespoon (level) = 1.05 cubic inch = 3 level teaspoons = 17.21                                     cubic centimeters

Cup = 16 level tablespoons = 16.8 cubic inches = 275.3 cubic             centimeters

Pint = 2 cups = 32 level tablespoons = 33.6 cubic inches = 550.6 cubic centimeters
Volumes
Cubic Inch = 0.00058 cubic foot = 16.4 cubic                        centimeters

Cubic Foot = 1,728 cubic inches = 0.037 cubic yard                      = 0.028 cubic  meter

Cubic Yard = 27 cubic feet = 0.765 cubic meters
Temperature
(1.8 x c) +32  Celsius, C    Fahrenheit, F 0.56 (F-32)
                         -17.8°                 0°F
                            0°C                32°F
                          20°C                68°F
                        100°C              212°F
Weights
Gram = 15.43 grains = 1,000 milligrams

Ounce = 28.35 = 437.5 grains

Pound = 16 ounces = 7,000 grains = 454 grams

Kilogram = 1,000 grams = 2.205 pounds

Ton (short)= 2,000 pounds = 0.907 metric tons

Ton (long) = 2,240 pounds = 1,016 metric tons
Volume Conversion Factors
Cu. Ft x 7.48 = gallons

Cu. Ft x 62.4 = lbs. of water

Gallons x 8.333 = lbs. of water

Gallons x 0.1337 = Cu. Ft.

Cu. In. / 1,728 = Cu. Ft.

Cu. Yd. x 27 = Cu. Ft.

Cu. Ft. / 27 = Cu. Yds.

 
Metric Prefix Definitions
Mega = 1,000,000

Micro = 0.000001

Kilo = 1,000         Milli = 0.001

Hecto = 100          Centi = 0.01

Deca = 10              Deci = 0.1

Basic Metric Unit = 1