Imperial/Metric Conversion Table

Convert common factors from imperial units to metric SI units.

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Length
  • 1 in = 25.4 mm
  • 1 ft = 0.3048 m
  • 1 yd = 0.9144 m
 Area
  • 1 in² = 645.16 mm²
  • 1 ft² = 0.092903 m²
  • 1 yd² = 0.836127 m²
 Volume
  • 1 in³ = 16.3871 cm³
  • 1 ft³ = 0.0283168 m³
  • 1 yd³ = 0.764555 m³
  • 1 pt (UK) = 0.000568261 m³
Kinetic Velocity
  • 1 ft/min = 0.00508 m/s
  • 1 ft/min = 0.3048 m/min
  • 1 ft/s = 0.3048 m/s
 Mass
  • 1 oz (avdp) = 28.3495 g
  • 1 lb = 0.453592 kg
  • 1 ton (long) = 1016.05 kg
 Density
  • 1 lb/in³ = 27679.9 kg/m³
  • 1 lb/ft³ = 16.0185 kg/m³
  • 1 lb/gal (UK) = 99.776398 kg/m³
Energy
  • 1 Btu (IT) = 0.00001 thm
  • 1 Btu (IT) = 1.05506 kJ
  • 1 hph = 2.6845195377 MJ
  • 1 kWh = 3.6 MJ
  • 1 cal = 4.1858 J
 Specific Energy
  • 1 Btu (IT)/lb = 0.556 kcal/kg
  • 1 Btu (IT)/lb = 2326 J/kg
  • 1 ft·lbf/lb = 2.98907 J/kg
 Specific Entropy
  • 1 Btu (IT)/lb·°R = 4186.8 J/kg·K
  • 1 Btu (IT)/lb·°F = 4186.8 J/kg·K
  • 1 Btu (IT)/lb·°F = 4.1868 kJ/kg·K
Specific Heat Capacity
  • 1 Btu (IT)/lb·°F = 4186.8 J/kg·K
  • 1 Btu (IT)/lb·°F = 4.1868 kJ/kg·K
  • 1 Btu (IT)/lb·°F = 4.1868 kJ/kg·°C
 Thermal Conductivity
  • 1 Btu (IT)·ft/ft²·h·°F = 1.73 W/m·°K
  • 1 Btu (IT)·in/ft²·h·°F = 0.144228 W/m·°K
  • 1 Btu (IT)·in/ft²·h·°F = 0.000344482 cal/cm·s·°C
 Volumetric Flow Rate
  • 1 gal (UK)/s = 0.00454609 m³/s
  • 1 gal (UK)/h = 0.00454609 m³/h
  • 1 gal (UK)/h = 4.54609 L/h