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Three nations have not officially adopted the International System of Units as their primary or sole system of measurement: Liberia, Myanmar and the United States.
 

Unit Conversion Chart

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Length
inches 2.54 centimeters millimeters 0.04 inches
foot 30 centimeters centimeters 0.4 inches
yards 0.91 meters meters 3.3 feet
miles 1.6 kilometers kilometers 0.62 miles
Area
sq. inches 6.5 sq. centimeters sq. centimeters 0.16 sq. inches
sq. feet 0.09 sq. meters sq. meters 1.2 sq. yards
sq. yards 0.8 sq. meters sq. kilometers 0.4 sq. miles
sq. miles 2.6 sq. kilometers hectares 2.47 acres
acres 0.4 hectares
Mass (Weight)
ounces 28 grams grams 0.035 ounces
pounds 0.45 kilograms kilograms 2.2 pounds
short ton 0.9 metric ton metric tons 1.1 short tons
Volume
teaspoons 5 milliliters milliliters 0.03 fluid ounces
tablespoons 15 milliliters liters 2.1 pints
fluid ounces 30 milliliters liters 1.06 quarts
cups 0.24 liters liters 0.26 gallons
pints 0.47 liters cubic meters 35 cubic feet
quarts 0.95 liters cubic meters 1.3 cubic yards
gallons 3.8 liters
cubic feet 0.03 cubic meters
cubic yards 0.76 cubic meters
Temperature
Fahrenheit (F - 32) x 5/9 Celsius Celsius (C x 9/5) + 32 Fahrenheit

To Convert Multiply By To Obtain
Acres 43,560 Sq. feet
Acres 0.00405 Sq. kilometer
Acres 4047 Sq. meter
Acres 4840 Sq. yards
Acre-feet 325,851 Sq. feet
Acre-feet 43560 Cu. feet
Acre-feet 1233.5 m (cubed)
Bar 14.5 Lb/sq.in.
Bar 1019.7 g/cm (cubed)
Bar 29.53 inches Hg at 0 degrees C
Bushels (dry) 0.03524 msquared
Centimeters (cm) 0.03281 Feet
Centimeters (cm) 0.3937 Inches
Centimeters (cm) 0.1094 Yards
Centimeters (cm) 0.01 Meters
Centimeters (cm) 10 Millimeters (ml)
cm/sec 1.9685 ft/min
cm/sec 0.0223694 MPH
cm (cubed) 0.0610237 inch (cubed)
Cubic feet 0.0283 Cu. meter
Cubic feet 7.4805 Gallons
Cubic feet 1728 Cubic inches
Cubic feet 0.037 Cubic yards
Cup 8 fl oz
Feet (ft) 30.48 Centimeters
Feet (ft) 0.3048 Meters
Feet per minute 0.01136 MPH
Feet head of water 0.433 PSI
Foot candle 10.764 Lux
Gallons (gal) 3.785 Liters
Gal 3785 Millimeters
Gal 128 Ounces (liquid)
Gal/acre 9.354 Liters/hectare
Gal/acre 2.938 Oz/1000 ftsquared (liquid)
Gal/1000 ftsquared 4.0746 L/100 msquared
Gal/minute 2.228 x 10 (-3) Cubic feet/second
Grams (g) 0.002205 Pounds
Grams (g) 0.035274 oz
G/ha 0.000893 lbs/a
Grams per liter 1000 PPM
Grams per liter 10 Percent
Grams/sq.meter 0.00020481 lb/sq.feet
G/cm (cubed) 0.036127 lb/in (cubed)
G/cm (cubed) 62.428 lb/ft (cubed)
Hectares (ha) 2.471 Acres
Inches 2.54 Centimeters
Inches 0.0254 Meters
Inches 25.4 Millimeters
Insquared 6.4516 cmsquared
In (cubed) 16.3871 cm (cubed)
Kilograms (kg) 2.2046 Pounds
Kg/hectare 0.892 Pounds/acre
Kg/ha 0.02048 lb/1000 ftsquared
Kg/L 8.3454 lb/gal
Kilometers (Km) 100,000 Centimeters
Kilometers (Km) 3281 Feet
Kilometers (Km) 1000 Meters
Kilometers (Km) 0.6214 Miles
Kilometers (Km) 1094 Yards
Km/h 0.62137 MPH
Km/h 54.6807 ft/min
Kilopascals (kPa) 0.145 Pounds/sq.in. (psi)
Liters (l) 0.2642 Gallons
Liters (l) 33.814 Ounces
Liters (l) 2.113 Pints
Liters (l) 1.057 Quarts
L/100 msquared 0.2454 gal/1000 ftsquared
Liters/hectare 0.107 Gallons/acre
Meters (m) 3.281 Feet
Meters (m) 39.37 Inches
Meters (m) 1.094 yards
Meters (m) 100 Centimeters
Meters (m) 0.001 Kilometers
Meters (m) 1000 Millimeters
Meters/sec 2.2369 MPH
Msquared 10.764 ftsquared
M (cubed) 35.3147 ft (cubed)
M (cubed) 1.30795 yd (cubed)
Miles (statute) 160,900 Centimeters
Miles 5280 Feet
Miles 1.609 Kilometers
Miles 1760 Yards
Miles/hour (mph) 1.467 Feet/second
Miles/hour (mph) 88 Feet/minute
Miles/hour (mph) 1.61 Kilometers/hour
Miles/hour (mph) 0.447 meter/second
Milliliters (ml) 0.0338 Ounces (fluid)
Milliliters (ml) 0.0002642 Gallons
Millimeters (mm) 0.03937 Inches
1 mm Hg @ 0 C 0.13332 kPa
Ounces (fluid) 0.02957 Liters
Ounces (fluid) 29.573 Milliliters
Ounces (weight) 28.35 Grams
Parts per million (ppm) 2.719 lb ai/acre foot of water
PPM 0.001 Grams/l
PPM 8.34 Lb/million gal
PPM 1 mg/kg
PPM 0.013 Ounces/100 gal of water
PPM 0.3295 Gal/acre-foot of water
PPM 8.345 lbs/million gal of water
Percent (%) 10 g/kg
Pint 0.473 liter
pt/A 1.1692 L/ha
pt/A 0.3673 oz/1000 ftsquared
Pounds 0.4536 Kilograms
Pounds 453.6 Grams
Pounds/acre 1.12 Kg/hectare
Pounds/A 0.02296 lb/1000 ftsquared
Pounds/sq.ft. 4883 Grams/sq.meter
Pounds/1000 ftsquared 43.5597 lb/A
Pounds/yd (cubed) 0.0005937 G/cm (cubed)
Pounds/gallon 0.12 Kg/liter
PSI (lbs/sq.in.) 6.9 Kilopascals
PSI (lbs/sq.in.) 0.06895 Bar
PSI (lbs/sq.in.) 0.068046 atm
PSI (lbs/sq.in.) 2.31 feet head of water
PSI (lbs/sq.in.) 6.89 kPa
Quarts 0.9463 Liters
Qt/A 2.3385 L/ha
Qt/A 0.7346 oz/1000 ftsquared
Sq. centimeters 0.001076 Sq. feet
Sq. centimeters 0.155 Sq. inches
Sq. feet 929 Sq. centimeters
Sq. feet 0.0929 Sq. meters
Sq. feet 9.294 x 10 (-6) Hectares
Sq. inch 6.452 Sq. centimeters
Ton (2000 lbs) 907 kg
Yards 91.44 Centimeters
Yards 0.9144 Meters
Yards 914.4 Millimeters
yd (cubed) 27 ft (cubed)
yd (cubed) 0.7645 m (cubed)

Area Equivalents

1 acre = 43,560 ft squared = 4840 yd 2 = 0.4047 hectares = 160 rods squared = 4047 m 2 = 0.0016 sq. mile
1 acre-inch = 102.8 m 3 = 27,154 gal = 3630 ft 3
1 hectare (ha) = 10,000 m 2 = 100 are = 2.471 acres = 107,639 ft squared
1 cubic foot (ft 3 ) = 1728 in 3 = 0.037 yd 3 = 0.02832 m 3 = 28,320 cm 3
1 square foot (ft 2 ) = 144 in 2 = 929.03 cm 2 = 0.09290 m 2
1 square yard (yd 2 ) = 9 ft 2 = 0.836 m 2
1 cubic yard (yd 3 ) = 27 ft 3 = 0.765 m 3

Units Sq. In. Sq. Ft. Sq Yd. Sq. cm Sq. m
Sq. In. 1 0.006944 0.0007716 6.452 0.000645
Sq. Ft. 144 1 0.1111 929 0.0929
Sq Yd. 1296 9 1 8361 0.8361
Sq. cm 0.155 0.001076 0.0001196 1 0.0001
Sq. m     1550 10.76 1.196 10,000 1

Liquid Equivalents

1 ft (cubed) of water = 7.5 gal = 62.4 lbs. = 28.3 liters
1 acre-inch of water = 27,154 gal = 3630 ft 3
1 liter (l) = 2.113 pts. = 1000 ml = 1.057 qts. = 33.8 fl.oz. = 0.26 gal
1 US gallon=4 qt.=8 pt. = 16 cups = 128 fl.oz. = 8.337 lbs of water = 3.785 L = 3785 ml = 231 in 3 = 256 tbsp. = 0.1337 ft3
1 quart = 0.9463 liters = 2 pt. = 32 fl. oz. = 4 cups = 64 tablespoons (tbsp.)=57.75 in 3 = 0.25 gal = 946.4 ml
1 pint = 16 fl. oz. = 2 cups = 473.2 ml = 32 level tablespoons = 0.125 gal = 0.5 qt
1 cup = 8 fl. oz. = = ½ pt. = 16 tablespoons = 236.6 ml
1 tablespoon = 14.8 ml = 3 teaspoons (tsp.) = 0.5 fl.oz.
1 milliliter (ml) = 1 cm 3 = 0.34 fl.oz. = 0.002 pts
1 teaspoon = 4.93 ml = 0.1667 fl. oz. = 80 drops
1 US fluid ounce = 29.57 ml = 2 tablespoons = 6 tsp. = 0.03125 qt

Temperature Equivalents

degrees Centigrade = (°F-32)x5/9
degrees Fahrenheit = (°Cx9/5)+32

Pressure Equivalents

1 lb per square inch (PSI) = 6.9 kilopascal (kPa)
1 PSI = 2.31 feet head of water

Units Dyne Lb. Newton
Dyne 1 2.248x10-6 10-5
Lb. 444,823 1 4.448
Newton 100,000 0.2248 1

Length Equivalents

centimeter (cm) = 0.3937 inch = 0.01 m = 0.03281 ft.
meter (m) = 3.28 feet = 39.4 inches = 100 cm = 1.094 yds = 1000 mm
kilometer = 0.621 statute mile = 1000 meters = 100,000 cm = 3281 ft = 39,370 in.
inch = 2.54 cm = 25.4 mm = 0.0254 m = 0.08333 ft.
foot = 0.3048 meters = 30.48 cm = 12 inches
yard = 0.9144 meters = 3 feet = 36 inches = 91.44 cm
statute mile = 1760 yards = 5280 feet = 1.61 kilometers = 1609 meters

Mixture Ratios

1 mg/g = 1000 ppm
1 fl.oz./gal = 7490 ppm
1 fl.oz./100 gal = 75 ppm
1 pt/100 gal = 1 teaspoons/1gal
1 qt/100 gal = 2 tablespoons/1 gal

Flow

1 gpm = 0.134 ft 3 /minute
1 ft (cubed) /min. (cfm) = 449 gal/hr. (gph) = 7.481 gal/min.

Weight Equivalents

1 ton (US) = 2000 lb = 0.907 metric tons = 907.2 kg
1 metric ton = 10 6 g = 1000 kg = 2205 lb
1 lb = 16 oz = 453.6 grams (g) = 0.4536 kg
1 oz (weight) = 28.35 g = 0.0625 lb
1 gram = 1000 mg = 0.0353 oz = 0.001 kg = 0.002205 lb
milligrams (mg) = 0.001 grams
1 kilogram (kg) = 1000 grams = 35.3 oz = 2.205 lbs
microgram (mg) = 10 -6 grams = 0.001 mg
nanogram (ng) = 10 -9 grams = 0.001 micrograms (mg)
picogram = 10 -12 grams
1 ppm= 0.0001%= 0.013 fl oz in 100 gal =1 mg/kg=1 mg/L=1 mg/g= 0.379 g in 100 gal water= 8.34 x 10 -6 lb/gal=1ml/l
10 ppm = 0.001% = 10 mg/L 100 ppm = 0.01% = 100 mg/L1000 ppm = 1mg/g = 0.1% = 1000 mg/L
1 ppb = 1 ug/kg or 1 ug/L or 1 ng/g
1 ppt = 1 picogram/g
1 % = 10,000 ppm = 10g/L = 1g/100ml = 10g/kg = 1.33 oz by weight/gal water = 8.34 lbs/100 gal water
  
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