CONVERSION TABLE
Quantity Non - SI Unit Metric (SI) Unit Conversion Factors (Approximate)
    Non - SI to Metric  Metric (SI) to 
      (SI) Units Non - SI Units
Length Inch (in) millimetre (mm) or centimetre (cm) 1 in = 25,4 mm 1 cm = 0,394 in
  Foot (ft) centimetre (cm) or metre (m) 1 ft = 30,5 cm 1 m = 3,28 ft
  Yard (yd) metre (m) 1 yd = 0,914 1 m = 1,09 yd
  Mile kilometre (km) 1 mile = 1,61 km 1 km = 0,62 mile
Area Square inch (in²) Square millimetre (mm²) 1 in² = 645 mm²  1 mm² = 0,002 in²
  Square inch (in²) Square centimetre (cm²) 1 in² = 6,45 cm² 1 cm² = 0,155 in²
  Square foot (ft²) Square centimetre (cm²) 1 ft² = 929 cm² 1 m² = 10,76 ft²
    or square metre (m²)    
  Square yard (yd²) Square metre (m²) 1 yd²  = 0,836 m² 1 m² = 1,20 yd²
  Acre Hectare (ha) 1 acre = 0,405 ha 1 ha = 2,47 acres
  Square mile Square kilometre (km²) 1 square mile = 2,59 km² 1 km² = 0,387 square mile
Volume Cubic inch (in³) cubic centimetre (cm³) 1 in³ = 16,4 cm³ 1 cm³ = 0,06 in³
  Cubic foot (ft³) cubic decimetre (dm³)  1 ft³ = 28,3 dm³ 1 m³ = 35,3 ft³
    or cubic metre (m³)    
  Cubic yard (yd³) cubic metre (m³) 1 yd³ = 0,765 m³ 1 m³ = 1,31 yd³
Volume  Fluid ounce UK (fl oz UK) millilitre (mℓ) 1 fl. oz (UK) = 28,4 mℓ 1 mℓ = 0,035 fl. oz (UK)
(fluids) Pint UK (pt UK) millilitre (mℓ) or litre (ℓ) 1 pint (UK) = 568 mℓ 1 ℓ = 1,76 pint (UK)
  Gallon UK (gal UK) litre (ℓ) or cubic metre (m³) 1 gallon (UK) = 4,55 ℓ 1 m³ = 220 gallons (UK)
  Fluid ounce US (fl oz US) millilitre (mℓ) 1 fl. oz (US) = 29,6 mℓ 1 mℓ = 0,034 fl. oz (US)
  Pint US (pt US) millilitre (mℓ) or litre (ℓ) 1 pint (US) = 473 mℓ 1 ℓ = 2,11 pint (US)
  Gallon US (gal US) litre (ℓ)   1 galllon (US) = 3,79 ℓ 1 ℓ = 0,264 gallons (US)
Mass Ounce (oz) gram (g) 1 oz = 28,3 g 1 g = 0,035 oz
  Pound (lb) gram (g) or kilogram (kg) 1 lb = 454 g 1 kg = 2,20 lb
  Ton tonne (t) 1 ton = 1,02 tonnr 1 tonne = 0,984 ton
  Tael gram (g) 1 tael = 37,8 g 1 g = 0,026 tael
  Catty kilogram (kg) 1 catty = 0,605 kg 1 kg = 1,65 catties
  Picul kilogram (kg) 1 picul = 60,50 1 kg = 0,017 picul
Force Pound - force (lbf) newton (N) 1 lbf = 4,45 N 1 N = 0,225 lbf
  Kilogram force (kgf) newton (N) 1 kgf = 9,81 N 1 N = 0,102 kgf
Pressure Pound force per square inch (psi) kilopascal (kPa) 1 psi = 6,89 kPa 1 kPa = 0,145 psi
  Kilogram force per kilopascal (kPa) 1 kgf /cm² = 98 kPa 1 kPa = 0,01 kgf/cm²
  square centimetre (kgf/cm²)    
  Inch of water (in H2O) pascal (Pa) 1 in H2O = 249 Pa 1 Pa = 0,004 in H2O
  Bar kilopascal (kPa) 1 bar = 100 kPa 1 kPa = 0,01 bar
Velocity Mile per hour (mph) kilometre per hour (km/h) 1 mph = 1,61 km/h 1 km/h = 0,62 mph
Temperature Fahrenheit temp (ºF) celcius temp (ºC) ºC = 5 (ºF - 32) / 9 ºF = 9 x ºC / 5 + 32
Density Pound per cubic inch (lb/in) gram per cubic centimetre (g/cm³) 1 lb/in³ = 27,7 t/m³ 1 t/m³ = 0,036 lb/in³
     = tonne per cubic metre (t/m³)    
  Pound per cubic foot (lb/ft³) kilogram per cubic metre (kg/m³) 1 lb/ft³ = 16,02 kg/m³ 1 kg/m³ = 0,06 lb/ft³
  Ton per cubic yard (ton/yd³) tonne per cubic metre (t/m³) 1 ton/yd³ = 1,33 t/m³ 1 t/m³ = 0,752 ton/yd³
Energy Britisch termal unit (Btu) kilojoule (kJ) 1 Btu = 1,06 kJ 1 kJ = 0,948 Btu
  Therm megajoule (MJ) 1 therm = 106 MJ 1 MJ = 9,48 x 10ˉ³ therm
Power Calorie (dietician) kilojoule (kJ) 1 cal (dietician) = 4 kJ 1 kJ = 0,23 Cal (dietician)
Fuel  Horsepower (hp) kilowatt (kW) 1 hp = 0,746 kW 1 kW = 1,34 hp
Consumption Miles per gallon (mpg) litres per 100 kilometres (ℓ/100 km) (n) x mpg =  (n) x ℓ/100 km = 
      282 / (n) ℓ/100 km 282 / (n) mpg