Conversion Factors

 

Constants

π = 3.14159...

e = 2.71828...

 

Length

1 inch = 2.54 cm                                  1 meter = 39.37 inch = 3.281 feet

1 foot = 0.3048 meter                         12 inches = 1 foot

3 feet = 1 yard                                    1 yard = 0.9144 meter

1 kilometer = 0.621 mile                       1 mile = 1.609 kilometer

1 mile = 5280 feet                               1 Å = 10-10 meter

1 μm = 1 μ = 10-6 m = 104 Å                    1 lightyear = 9.461 x 1015 m

 

Area

1 m2 = 106 cm3 = 10.76 ft2                                  1 ft2 = 0.0929 m2 = 144 inches2

1 inches = 6.452 cm2

 

Angle

1 radian = 57.296 degrees

1 degree = 0.0175 radian

 

Volume

1 m3 = 10 cm3 = 6.102 x 104 inches3            

1 ft3 = 1728 inches3 =2.83 x 10-2 m3

1 liter = 1000 cm3 = 1.0576 qt = 0.0353 ft3

1 ft3 = 7.481 gal = 28.32 liters = 2.832 x 10 m3

1 gal = 3.786 liters = 231 inches3

 

Mass

1000 kg = 1 t (metric ton)                    1 slug = 14.59 kg

1 u = 1.66 x 10-27 kg

 

Force

1 N = 105 dyne = 0.2248 lb                  1 lb = 4.448 N

1 dyne = 10-5 N = 2.248 x 10-6 lb

 

Velocity

1 mi/h = 1.47 ft/s = 0.447 m/s = 1.61 km/h

1 m/s = 100 cm/s = 3.281 ft/s              1 mi/min = 60 mi/h = 88 ft/s

 

Acceleration

1 m/s2 = 3.28 ft/s2 = 100 cm/s2            1 ft/s2 = 0.3048 m/s2 = 30.48 cm/s2

 

Pressure

1 bar = 105 N/m2 = 14.50 lb/inches2         1 atm = 760 mm Hg = 76.0 cm Hg

1 atm = 14.7 lb/inches2 = 1.013 x 105 N/m2

1 Pa = 1 N/m2 = 1.45 x 10 lb/inches2

 

Time

1 year = 365 days = 3.16 x 107 s

1 day = 24 h = 1.44 x 103 min = 8.64 x 104 s

 

Enegry

1 J = 0.738 ft*lb = 107 erg                  1 cal = 4.186 J

1 Btu = 252 cal = 1.054 x 103 J            1 eV = 1.6 x 10-19 J

931.5 MeV/c2 = 1 u                              1 kWh = 3.60 x 106 J

 

Power

1 hp = 550 ft*lb/s = 0.746 kW            1 W = 1 J/s = 0.738 ft*lb/s

1 Btu/h = 0.293 W