Conversion of non-metric into metric Si units

Units of length
Inch 1 in = 25.4 mm = 0.0254 m
Foot 1 ft = 304.8 mm = 0.3048 m
Yard 1 yd = 914.4 mm = 0.9144m
Units of mass
Ounce 1 oz = 28.35 g = 0.02832 kg
Pound 1 lb = 453.6 g = 0.4531 kg
Units of power
Horsepower 1 hp = 745.7 W
Pferdestärke 1 PS = 735.5 W
Temperature units
Fahrenheit °F = °C*9/5+32
Celsius °C = (°F-32)*5/9
Kelvin 0°C = 273.15 K
Units of pressure
Pound per square foot 1lb/sq ft = 4.882 kp/m2 = 47.8924N/m2
Pound per square inch 1lb/sq in (=1 psi) = 0.0703 kp/cm2 = 0.6896 N/cm2

Other units

  • 1 British mile = 1609 m
  • 1 international nautical mile = 1852 m
  • 1 geographic mile = 7420 m
  • 1 US gallon = 3.785 dm3 = 3.785 litres

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