Units and Conversions

LENGTH
FORCE
1 kilometer (km) = 1000 meters (m)
= 3281 feet (ft)
= 0.62 mile (mi)
1 Newton (N) = 1 kilogram meter per second per second
= 105 dyne
= 0.2248 lb
1 mile (mi)  = 5280 feet (ft)
= 1609 meters (m)
= 1.61 kilometers (km)
MASS
1 nautical mile = 1.15 statute mi
= 1.85 km
1 gram (g) = 0.035 ounce
= 0.002 lb
1 centimeter (cm) = 0.39 inch (in.)
= 0.01 m
= 10 millimeters (mm)
1 kilogram = 1000 g
= 2.2 lb
1 inch (in.) = 2.54 cm
= 0.08 ft
ENERGY
1 meter (m)  = 100 cm
= 3.28 ft
= 39.37 in
1 erg = 1 dyne cm
= 2.388 x 10-8 cal
1 feet (ft) = 0.3048 m 1 joule (J) = 0.239 cal
= 107 erg
1 micrometer (m = 0.0001 cm
= 0.000001 m
1 calorie (cal) = 4.186 J
= 4.186 x 107 erg
1 degree latitude = 111 km
= 60 nautical mi
= 69 statute mi
TEMPERATURE
AREA
1 degree Celsius (°C)  = 5/9(°F - 32)
1 square centimeter (cm2) = 0.15 in.2 1 degree Kelvin (K) = °C + 273
1 square inch (in.2) = 6.45 cm2 1 degree Fahrenheit = (°C x 1.8) + 32
1 square meter (m2) = 10.76 ft2
PRESSURE
1 square foot (ft2) = 0.09 m2 1 millibar (mb) = 1000 dynes cm-2
= 0.75 millimeter of mercury (mm Hg)
= 0.02953 inch of mercury (in. Hg)
= 0.01450 pound per square inch (lb in.-2)
= 100 pascals (Pa)
VOLUME
1 standard atmosphere  = 1013.25 mb
= 760 mm Hg
= 29.92 in. Hg
= 14.7 lb in.-2
1 cubic centimeter (cm3) = 0.06 in.3 1 inch of mercury = 33.865 mb
1 cubic inch (in.3) = 16.39 cm3 1 millimeter of mercury = 1.3332 mb
1 liter (l) = 1000 cm3
= 0.264 gallon (gal) U.S.
1 pascal = 0.01 mb
= 1 N m-2
SPEED
POWER
1 knot = 1 nautical m.p.h. (miles per hour)
= 1.15 statue m.p.h.
= 0.51 m s-1
= 1.85 km h-1
1 watt (W) = 1 J s-1
= 14.3353 cal min-1
1 mile per hour (m.p.h.) = 0.87 knot
= 0.45 m s-1
= 1.61 km h-1
1 cal min-1 = 0.06973 W
1 kilometer per hour (km h-1 = 0.54 knot
= 0.62 m.p.h.
= 0.28 m s-1
1 horse power = 746 W
1 meter per second (m s-1) = 1.94 knots
= 2.24 m.p.h.
= 3.60 km h-1

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