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Unit Conversion Factors
Length
1 m = 100 cm = 1000 mm = 106μm = 109nm
1 km = 1000 m = 0.6214 mi
1 m = 3.281 ft = 39.37 in
1 cm = 0.3937 in
1 in. = 2.540 cm
1 ft = 30.48 cm = 0.3048 m
1 yd = 91.44 cm
1 mi = 5280 ft = 1.609 km
1 Å = 10-10 m = 10-8 cm = 10-1 nm
1 nautical mile = 6080 ft
1 light year = 9.461 x 1015 m
1 ft = 12 in
1 in = 2.54 cm
1 μm = 10-6 m = 10-4 cm
Mass 1 kg = 103 g = 0.0685 slug
1 g = 6.85 x 10-5 slug
1 slug = 14.59 kg
1 u = 1.661 x 10-27 kg
1 kg has a weight of 2.205 lb when g = 9.80 m/s2 1 kg = 2.205 lbm
1 slug = 32.17 lbm
1 lbm = 454 g1 lbm = 0.45359237 kg
Force 1 N = 105 dyn = 0.2248 lb
1 lb = 4.448 N = 4.448 x 105 dyn
1 dyn = 2.248 x 10-6 lbf
1 lbf = 4.448 N1 N = 105 dyn
1 lbf = 32.174 lbm ft/s2
Pressure 1 Pa = 1 N/m2 = 1.450 x 10-4 lb/in.2 = 0.209 lb/ft2 1 bar = 105 Pa = 0.1 MPa 1 lb/in.2 = 6895 Pa
1 lb/ft2 = 47.88 Pa
1 atm = 1.013 x 105 Pa = 1.013 bar = 14.7 lb/in.2 = 2117 lb/ft2 1 mm Hg = 1 torr = 133.3 Pa1 atm = 14.696 psia = 2116 lbf/ft2 1 atm = 101325 Pa = 14.696 lbf/in2
Energy 1 J = 107 ergs = 0.239 cal
1 cal = 4.186 J (based on 15° calorie)
1 ft-lb = 1.356 J
1 Btu = 1055 J = 252 cal = 778 ft-lb
1 eV = 1.602 x 10-19 J
1 kWh = 3.600 x 106 J
1 ft(lbf) = 1.356 J
1 kW(h) = 3413 Btu
1 hp(h) = 2545 Btu1 Btu = 252 cal
1 Btu = 778 ft(lbf)
Mass-Energy Equivalence
1 kg ↔ 8.988 x 1016 J
1 u ↔ 931.5 MeV
1 eV ↔ 1.074 x 10-9 u
Power
1 W = 1 J/s
1 hp = 746 W = 550 ft-lb/s
1 Btu/h = 0.293 W