Units Conversion Charts (Standard and Metric)

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1 Lengths & Distances (Example read the chart: 1 foot = 12 inches, 1 foot = meters, etc.; To multiply: 2 feet = 2 x 12 inches.) From/To feet inches meters miles yards foot x inch (1/63360) meter x mile yard x10-4 Useful Exact Length Relationships mile = 1760 yards = 5280 feet yard = 3 feet = 36 inches foot = 12 inches inch = 2.54 centimeters Area (Example read the chart: 1 acre = feet 2, etc.; To multiply: 2 acres = 2 x feet 2.) From/To acres feet 2 inches 2 meters 2 miles 2 yards 2 acre x foot x x inch x x x x x10-4 meter x x mile x x yard 2 (1/4840) x10-7 Note that when converting area units: 1 foot = 12 inches (1 foot) 2 = (12 inches) 2 (square both sides) 1 foot 2 = 144 inches 2 The linear & area relationships are not the same!

2 Volume (Example read the chart: 1 foot 3 = gallons, 1 foot 3 = 1728 in 3, etc.; To multiply: 2 feet 3 = 2 x 1728 in 3.) From/To feet 3 gallons inches 3 liters meters 3 miles 3 pints quarts yards 3 foot x gallon x inch x x x x x10-5 liter x x x10-3 meter x mile x x x x x x x x10 9 pint x x x x10-4 quart x x x10-3 yard x x x Useful Exact Volume Relationships fluid ounce = (1/8) cup = (1/16) pint = (1/32) quart = (1/128) gallon gallon = 128 fluid ounces = 231 inches3 = 8 pints = 4 quarts quart = 32 fluid ounces = 4 cups = 2 pints = (1/4) gallon cup = 8 fluid ounces = (1/2) pint = (1/4) quart = (1/16) gallon mile = inches = 5280 feet = 1760 yards yard = 36 inches = 3 feet = (1/1760) mile foot = 12 inches = (1/3) yard = (1/5280) mile pint = 16 fluid ounces = (1/2) quart = (1/8) gallon Note that when converting volume units: 1 foot = 12 inches (1 foot) 3 = (12 inches) 3 (cube both sides) 1 foot 3 = 1728 inches 3 The linear & volume relationships are not the same!

3 Mass (Weight) (Example read the chart: 1 pound = kgs, 1 ton (std.) = 2000 pounds, etc.; To multiply: 2 tons = 2 x 2000 pounds.) From/To pounds tons* grams kilograms metric ton milligram microgram pounds x x x10 8 tons* x x x10 11 grams 2.2x x x x10 6 kilograms x x10 6 1x10 9 metric ton x x10 9 1x10 12 milligram 2.2x x x10-6 1x microgram 2.2x x x10-6 1x10-9 1x *Standard (American) short tons Pressure (Example read the chart: 1 atm = 760 mm Hg, etc.; To multiply: 2 atm = 2 x 760 mm Hg.) From/To atmosphere mm Hg millibars psi (lb/in 2 ) inches Hg atmosphere 760 1, mm Hg 1.316x millibars 9.869x psi (lb/in 2 ) inches Hg Temperature Use the following equations to convert temperature values where C = degrees Celsius and F = degrees Fahrenheit: C = (F 32) (5/9) F = (9/5)C + 32 Kelvins = Degrees Celsius + 273

4 The following table is useful for solving units conversion problems using DIMENSIONAL ANALYSIS. Each item under a heading is equivalent to any other item within that category (e.g. under Length, 3.28 feet = 1 meter = 1x10 6 microns). Length Volume Time Area 1 meter (m) 100 cm 3.28 feet yd 1000 mm 1x10-3 km 39.4 inches 6.21x10-4 mile 1x10 6 micrometers (or microns) 1 Liter (L) 61.0 in ft ml 1000 cm x 10-3 m gal (US liquid) 1.06 qt (US liquid) 1 hour 60.0 min 3600 sec day 5.95x10-3 wk 1.14x10-4 year 1 m ft 2 1x10 6 km x10-7 mile x10-4 acre 1x10-4 hectare Mass Density Pressure Mass Flow Rate 1 gram kg 2.2x10-3 pounds 1x10 3 milligram (mg) 1x10 6 microgram (mg) 1.1x10-6 ton (std. short) 1x10-6 metric ton 1 kg/l 1 g/ml 1000 g/l 1000 kg/m 3 1 atmosphere (atm) 760 mm Mercury (Hg) 1015 millibars 14.7 psi (lb/in 2 ) 29.9 inches Mercury (Hg) 1 kg/sec 3600 kg/hour kg/day 1000 g/sec 3.6x10 6 g/hour 8.64x10 7 g/day tons per year (tpy) Velocity Energy Power Angles 1 m/s (meters per second) 2.24 mph (miles per hour) 1.95 knots (nautical miles per hour) 1 Joule 1x10 7 erg calorie 9.48x10-4 BTU 2.78 x 10 7 kw H 1 Watt 1x10-3 kw 1x10 7 erg/sec 1 Joule/second 1.34x10-3 horsepower 1 circle 360 degrees minutes 1.30x10 6 seconds

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