Longitud

  • 1 m = 100 cm = 1000 mm = 106 μm = 109 nm
  • 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
  • 1 yd = 91.44 cm
  • 1 mi = 5280 ft = 1609 km
  • 1 amstrong = 10-10 m = 10-8 cm = 10-1 nm
  • 1 milla naútica = 6080 ft
  • 1 año luz = 9461 x 1015 m

Area

  • 1 cm2 = 0.155 in2
  • 1 m2 = 104 cm2 = 10.76 ft2
  • 1 in2 = 6.452 cm2
  • 1 ft = 144  in2 = 0.0929 m2

Volumen

  • 1 litro = 1000 cm3 = 10-3 m3 = 0.03531 ft3 = 61.02 in3
  • 1 ft3 = 0.02832 m3 = 28.32 litros = 7477 galones
  • 1 galón = 3788 litros

Tiempo

  • 1 min = 60 s
  • 1 h = 3600 s
  • 1 día = 86400 s
  • 1 año = 365.24 d = 3.156 x 107 s

Angulo

  • 1 rad = 57.30º = 180º/π
  • 1º = 0.01745 rad = π/180 rad
  • 1 revolución = 360º = 2π rad
  • 1 rev/min (rpm) = 0.1047 rad/s

Rapidez

  • 1 m/s = 3.281 ft/s
  • 1 ft/s = 0.3048 m/s
  • 1 mi/min = 60 mi/h = 88 ft/s
  • 1 km/h = 0.2778 m/s = 0.6214 mi/h
  • 1 mi/h = 1.466 ft/s = 0.4470 m/s = 1.609 km/h
  • 1 furong/14 días = 1.662 x 10-4 m/s

Aceleración

  • 1 m/s2 = 100 cm/s2 = 3.281 ft/s2
  • 1 cm/s2 = 0.01 m/s2 = 0.03281 ft/s2
  • 1 ft/s2 = 0.3048 m/s2 = 30.48 cm/s2
  • 1 mi/h*s = 1.467 ft/s2

Masa

  • 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 tiene un peso de 2.205 lb cuando g = 9.80 m/s2

Fuerza

  • 1 N = 105 dinas = 0.2248 lb
  • 1 lb = 4.448 N = 4.448 x 105 dinas

Presión

  • 1 Pa = 1 N/m2 = 1.450 x 10-4 lb/in2 = 0.209 lb/ft2
  • 1 bar = 105 Pa
  • 1 lb/in2 = 6895 Pa
  • 1 lb/ft2 = 47.88 Pa
  • 1 atm = 1.013 x 105 Pa = 1.013 bar = 14.7 lb/in2 = 2117 lb/ft2
  • 1 mm Hg = 1 torr = 133.3 Pa

Energía

  • 1 J = 107 erg = 0.239 cal
  • 1 cal = 4.186 J (con base en caloría de 15º)
  • 1 ft*lb = 1.356 J
  • 1 eV = 1.602 x 10-19 J
  • 1 kWh = 3.600 x 106 J

Equivalencia masa – energía

  • 1 kg <-> 8.988 x 1016 J
  • 1 u <-> 931.5 MeV
  • 1 eV <-> 1.074 x 10-9 u

Potencia

  • 1 W = 1 J/s
  • 1 hp = 746 W = 550 ft*lb/s
  • 1 Btu/h = 0.293 W