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