Technical Information

Common conversion factors from imperial units to metric SI units:

Length

1 inch = 25.4mm
1 foot = 0.3048m
1 yard = 0.9144m

Area

1 in² (square inch) = 645.16mm²
1 ft² (square foot) = 0.0929030m²
1 yd² (square yard) = 0.836127m²

Volume,capacity

1 in³ (cubic inch) = 16.3871cm³
1 ft³ (cubic foot) = 0.0283168m³
1 yd³ (cubic yard) = 0.764555m³
1 Pint = 0.568261m³

Velocity

1 ft/min = 0.00508m/s or 0.3048m/min
1 ft/s = 0.3048m/s

Mass

1 oz = 28.3495g
1 lb = 0.45359237kg
1 ton (2240lb) = 1016.05kg

Thermal Conductivity

1 Btu ft/ft²h°F = 1.73073 W/m°C (Jm/m²s°C)

Volume rate of flow

1 gal/h = 4.5609m³/h

Thermal capacity per unit mass, specific heat capacity

1 Btu/lb°F = 4186.8 J/kg°C
1 ft lbf/lb°F = 5.38032J/kg°C

Specific energy, specific latent heat

1 Btu/lb = 2326 J/kg
1 ft lbf/lb = 2.98907 J/kg

Density

1 lb/in³ = 27.6799Mg/m³
1 lb/ft³ = 16.0185 kg/m³
1 lb/gal = 99.7763kg/m³

Specific entropy

1 Btu/lb°R = 4186.8 J/kg K

Energy, work, quantity of heat

1 therm = 105.506 MJ hph (horsepower x hour) = 2.68452 MJ 1 kWh = 3.6MJ 1 Btu (British thermal unit) = 1.05506kJ 1 cal (calorie I.T.) = 4.1868J

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