United States Customary Units - Other Units

Other Units

  • 1 board-foot = 1 ft × 1 ft × 1 in = 2.360 dm3
  • 1 British thermal unit (Btu) ≈ 1055 J
  • 1 calorie (cal) = 4.184 J
  • 1 large calorie (kilocalorie, food calorie) (Cal, kcal) = 4.184 kJ
  • 1 hand = 10.16 cm
  • 1 horsepower ≈ 745.7 W
  • 1 R-value (ft2·°F·h/Btu) ≈ 0.1761 RSI (K·m2/W)
  • 1 slug (mass) = 1 lbf·s2/ft
  • Various combination units are in common use, including the foot-pound and the pound per square inch; these are straightforwardly defined based on the above basic units.

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