Units Conversion Charts (Standard and Metric)
The following table is useful for solving units conversion problems using UNIT FRACTIONS. Each item under a
heading is equivalent to any other item under the same heading (e.g. under Length, 3.28 feet = 1 meter = 1x10 6
micrometers (older term is microns).
Length
1 meter (m)
100 cm
3.28 feet
1.094 yd
1000 mm
1x10-3 km
39.4 inches
6.21x10-4 mile
1x106 micrometers (or microns)
Mass
1 gram
0.001 kilogram (kg)
1x103 milligram (mg)
1x106 microgram (µg)
0.03527 dry ounces
2.2x10-3 pounds
1.1x10-6 ton (standard short)
1x10-6 metric ton
Velocity
1 m/s (meters per second)
2.24 mph (miles per hour)
1.95 knots (nautical miles per
hour)
Volume
1 Liter (L)
61.0 in3
0.0353 ft3
1000 mL
1000 cm3
1.00x 10-3 m3
0.264 gal (US liquid)
1.06 qt (US liquid)
2.113 pint (US liquid)
Density
1 kg/L
1 g/mL
1000 g/L
1000 kg/m3
Energy
1 Joule
1x107 erg
0.239 calorie
9.48x10-4 BTU
2.78 x 10–7 kW H
Time
1 hour
60.0 min
3600 sec
0.0417 day
5.95x10-3 wk
1.14x10-4 year
Area
1 m2
1.55x103 in2
10.76 ft2
1.19599 yd2
1x10-6 km2
3.861x10-7mile2
2.47x10-4 acre
1x10-4 hectare
Pressure
1 atmosphere (atm)
760 mm Mercury (Hg)
1015 millibars
14.7 psi (lb/in2)
29.9 inches Mercury (Hg)
Mass Flow Rate
1 kg/sec
3600 kg/hour
86400 kg/day
1000 g/sec
3.6x106 g/hour
8.64x107 g/day
34762.5 tons per year (tpy)
Power
1 Watt
1x10-3 kW
1x107 erg/sec
1 Joule/second
1.34x10-3 horsepower
Angles
1 circle
360 degrees
21600 minutes
1.30x106 seconds
Compiled by the American Indian Air Quality Training Program at Northern Arizona University
Revised 2/17/14 pe
Units Conversion Charts (Standard and Metric)
Useful Exact Length Relationships
inch = 2.54 centimeters
foot = 12 inches = (1/3) yard = (1/5280) mile
yard = 36 inches = 3 feet = (1/1760) mile
mile = 63360 inches = 5280 feet = 1760 yards
kilometer = 1000 meters
Note that when converting area units:
1 foot = 12 inches
(1 foot)2 = (12 inches)2 (square both sides)
1 foot2 = 144 inches2
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
pint = 16 fluid ounces = (1/2) quart = (1/8) gallon
cubic meter = 1000 liters
Note that when converting volume units:
1 foot = 12 inches
(1 foot)3 = (12 inches)3 (cube both sides)
1 foot3 = 1728 inches3
Other Useful Relationships
kilogram = 2.2 pounds (rounded to 1 decimal place)
kilometer = 0.621 mile (rounded to 3 decimal places)
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
Compiled by the American Indian Air Quality Training Program at Northern Arizona University
Revised 2/17/14 pe
Units Conversion Charts (Standard and Metric)
Compiled by the American Indian Air Quality Training Program at Northern Arizona University
Revised 2/17/14 pe