Lengths & Distances (Example read the chart: 1 foot = 12 inches, 1 foot = 0.3048 meters, etc.; To multiply: 2 feet = 2 x 12 inches.) From/To feet inches meters miles yards foot 12 0.3048 1.894x10-4 0.33333 inch 0.0833 0.0254 (1/63360) 0.0278 meter 3.2808 39.37 6.2137 x 10-4 1.0936 mile 5280 63360 1609.344 1760 yard 3 36 0.9144 5.682x10-4 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 = 43560 feet 2, etc.; To multiply: 2 acres = 2 x 43560 feet 2.) From/To acres feet 2 inches 2 meters 2 miles 2 yards 2 acre 43560 6272640 4046.856 1.563x10-3 4840 foot 2 2.2957x10-5 144 0.09290304 3.6x10-8 0.1111 inch 2 1.59x10-7 6.944x10-3 6.4516x10-4 3.587006x10-10 7.716x10-4 meter 2 2.471x10-4 10.7639 1550.0031 3.861x10-7 1.19599 mile 2 640 27878400 2.78784x10 9 2.59x10 6 3097600 yard 2 (1/4840) 9 1296 0.83612736 3.2283x10-7 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!
Volume (Example read the chart: 1 foot 3 = 7.481 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 3 7.481 1728 28.317 0.028 6.794x10-12 59.844 29.922 0.037 gallon 0.1337 231 3.785 0.0038 9.082x10-13 8 4 0.00495 inch 3 5.79x10-4 4.329x10-3 0.0164 1.639x10-5 3.932x10-15 0.035 0.0173 2.143x10-5 liter 0.0353 0.264 61.024 1x10-3 2.399x10-13 2.113 1.0567 1.31x10-3 meter 3 35.3147 264.172 61023.74 1000 2.399x10-10 2113.376 1056.688 1.308 mile 3 1.47x10 11 1.101x10 12 2.544x10 14 4.168x10 12 4.168x10 9 8.809x10 12 4.405x10 12 5.452x10 9 pint 0.01671 0.125 28.875 4.732x10-2 4.7326x10-4 1.135x10-13 0.5 6.189x10-4 quart 0.0334 0.25 57.75 1.057 9.464x10-4 2.27x10-13 2 1.238x10-3 yard 3 27 4.95x10-3 46656 1.308x10-3 0.765 1.834x10-10 1615.792 807.896 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 = 63360 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!
Mass (Weight) (Example read the chart: 1 pound = 0.4545 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 0.0005 453.592 0.4536 4.536x10-4 4.536x10 5 4.536x10 8 tons* 2000 9.072x10 5 907.185 0.907 9.072x10 8 9.072x10 11 grams 2.2x10-3 1.1x10-6 0.001 1x10-6 1000 1x10 6 kilograms 2.2 1.1x10-3 1000 0.001 1x10 6 1x10 9 metric ton 2204.6 1.1 1x10 6 1000 1x10 9 1x10 12 milligram 2.2x10-6 1.1x10-9 0.001 1x10-6 1x10-9 1000 microgram 2.2x10-9 1.1x10-12 1x10-6 1x10-9 1x10-12 0.001 *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 1,013.25 14.696 29.92 mm Hg 1.316x10-3 1.3332 0.0193 0.0394 millibars 9.869x10-4 0.75 0.0145 0.0296 psi (lb/in 2 ) 0.068 51.715 68.948 2.036 inches Hg 0.0334 25.4 33.864 0.491 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
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 1.094 yd 1000 mm 1x10-3 km 39.4 inches 6.21x10-4 mile 1x10 6 micrometers (or microns) 1 Liter (L) 61.0 in 3 0.0353 ft 3 1000 ml 1000 cm 3 1.00x 10-3 m 3 0.264 gal (US liquid) 1.06 qt (US liquid) 1 hour 60.0 min 3600 sec 0.0417 day 5.95x10-3 wk 1.14x10-4 year 1 m 2 10.76 ft 2 1x10 6 km 2 3.861x10-7 mile 2 2.47x10-4 acre 1x10-4 hectare Mass Density Pressure Mass Flow Rate 1 gram 0.001 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 86400 kg/day 1000 g/sec 3.6x10 6 g/hour 8.64x10 7 g/day 34762.5 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 0.239 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 21600 minutes 1.30x10 6 seconds