The Web's best Machine Design Guide for Mechanical Engineers and Designers

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 Reference Data you can use, selected dimensional equivalents. DIMENSIONAL CONVERSIONS

 Length
 1 m = 3.2808 ft = 39.37 in 1 cm = 10-2 m = .394 in = .0328 ft 1 mm = 10-3 m 1 µm = 10-6 m 1 A = 10-10 m 1 km = .621 mi 1 mi = 5280 ft

 Area
 1 m2 = 10.76 ft2 1 cm2 = 10-4 m2 = .155 in2

 Volume
 1 gal = .13368 ft3 = 3.785 liters 1 liter = 10-3 m3

 Time
 1 h = 3600 s = 60 min 1 ms = 10-3 s 1 µs = 10-6 s 1 ns = 10-9 s

 Mass
 1 kg = 1000 g = 2.2046 lbm = 6.8521 * 10-2 slug 1 slug = 1 lbf s2 / ft = 32.174 lbm

 Temperature
 ° F = {(9 / 5) * ° C} + 32 ° C = (5 / 9) * (° F - 32) ° R = ° F + 459.69

 Force
 1 N = 1 kg m / s2 1 dyn =  1 g cm / s2 1 lbf = 4.448 * 10-5 dyn = 4.448 N

 Energy
 1 J = 1 kg m2 / s2 1 Btu = 778.16 ft lbf = 1.055 * 1010 ergs = 252 cal = 1055.0 J 1 cal = 4.186 J 1 kcal = 4186 J = 1000 cal 1 erg = 1 g cm2 / s2 = 10-7 J 1 eV = 1.602 * 10-19 J 1 Q = 1018 Btu = 1.055 * 1021 J 1 Quad = 1015 Btu 1 kJ = .947813 Btu = .23884 kcal

 Power
 1 W = 1 kg m2 / s3 = 1 J / s 1 hp = 550 ft lbf / s = 2545 Btu / h = 746 W 1 kW = 1000 W = 3412 Btu / h

 Pressure
 1 atm = 14.696 lbf / in2 = 760 torr = 101325 N / m2 1 mm Hg = .01934 lbf / in2 = 1 torr 1 dyn / cm2 = 145.04 * 10-7 lbf / in2 1 bar = 105 N / m2 = 14.504 lbf / in2 = 106 dyn / cm2 1 µ = 10-6 m Hg = 10-3 mm Hg 1 Pa = 1 N / m2 = 1.4504 * 10-4 lbf / in2 1 in Hg = 3376.8 N / m2 1 in H2O = 248.8 N / m2