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Common Conversion Factors
Quantity Non-SI Unit Metric (SI) Unit
Length inch (in)
millimeter (mm) or
centimeter (cm)
Conversion Factors (Approximate)
Non-SI
To
Metric (SI) Unit
1 in = 25.4 mm 1 cm = 0.39 in
foot (ft) centimeter (cm) or meter (m) 1 ft = 30.5 cm 1 m = 3.28 ft
yard (yd) meter (m) 1 yd = 0.914 m 1 m = 1.09 yd
Metric (SI)
To
Non-SI Units
mile kilometer (km) 1 mile = 1.61 km 1 km = 0.62 mile
Area square inch (in²) square millimeter (mm²) 1 in² = 645 mm² 1 mm² = 0.002 in²
square inch (in²) square centimeter (cm²) 1 in² = 6.45 cm² 1 cm² = 0.155 in²
square foot (ft²)
square centimeter (cm²) or
square meter (m²)
1 ft² = 929 cm² 1 m² = 10.76 ft²
square yard (yd²) square meter (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 kilometer (km²) 1 square mile = 2.59 km² 1 km² = 0.387 square mile
Volume cubic inch (in ³) cubic centimeter (cm ³) 1 in ³ = 16.4 cm ³ 1 cm ³ = 0.06 in ³
cubic foot (ft ³) cubic decimeter (dm ³) or cubic meter (m ³) 1 ft ³ = 28.3 dm ³ 1 m ³ = 35.3 ft ³
cubic yard (yd ³) cubic meter (m ³) 1 yd ³ = 0.765 m ³ 1 m ³ = 1.31 yd ³
Volume fluid ounce UK (fl. oz UK) milliliter (ml) 1 fl. oz (UK) = 28.4 ml 1 ml = 0.035 fl. oz (UK)
(fluids) pint UK (pt UK) milliliter (ml) or liter (L) 1 pint (UK) = 568 ml 1 L = 1.76 pint (UK)
gallon UK (gal UK) liter (L) or cubic meter (m ³) 1 gal (UK) = 4.55 L 1 m ³ = 220 gal (UK)
fluid ounce US (fl. oz US) milliliter (ml) 1 fl. oz (US) = 29.6 ml 1 ml = 0.034 fl. oz (US)
pint US (pt US) milliliter (ml) or liter (L) 1 pint (US) = 473 ml 1 L = 2.11 pt (US)
gallon US (gal US) liter (L) 1 gal (US) = 3.79 L 1 L = 0.264 gal (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 tonne 1 tone = 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 kg 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 square centimeter
(kgf/cm²)
kilopascal (kPa) 1 kgf/cm² = 98 kPa 1 kPa = 0.01 kgf/cm²
inch of water (inH₂O) pascal (Pa) 1 inH₂O = 249 Pa 1 Pa = 0.04 inH₂O
bar kilopascal (kPa) 1 bar = 100 kPa 1 kPa = 0.01 bar
Velocity mile per hour (mph) kilometer per hour (km/h) 1 mph = 1.61 km/h 1 km/h = 0.62 mph
Temperature Fahrenheit temp (˚F) Celsius temp (˚C)
Density pound per cubic inch (lb/in ³)
gram per cubic centimeter (g/cm ³) = tonne
per cubic meter (t/m ³)
5 (˚F-32)
˚C = ————-
9
9 x ˚C
˚F = —-——- + 32
5
1 lb/in ³) = 27.7 t/m ³ 1 t/m ³ = 0.036 lb/in ³
pound per cubic foot (lb/ft ³) kilogram per cubic meter (kg/m ³) 1 lb/ft ³ = 16.02 kg/m ³ 1 kg/m ³ = 0.06 lb/ft ³
ton per cubic yard (ton/yd ³) tone per cubic meter (t/m ³) 1 ton/yd ³ = 1.33 t/m ³ 1 t/m ³ = 0.752 ton/yd ³
Energy British thermal unit (Bru) kilojoule (kJ) 1 Btu = 1.06 kJ 1 kJ = 0.948 Btu
therm megajoule (MJ) 1 therm = 106 MJ 1 MJ = 9.48 x 10ֿ³ therm
calorie (dietician) kilojoule (kJ) 1 Cal (dietician) = 4 kJ 1 kJ = 0.23 Cal (dietician)
Power horsepower (hp) kilowatt (kW) 1 hp = 0.746 kW 1 kW = 1.34 hp
Fuel consumption
miles per gallon (mpg) liters per 100 kilometers (L/100 km)
先進機械工程有限公司
PROFICIENCY EQUIPMENT LTD.
(泰昇集團成員 A member of Tysan Group)
282
(n) x mpg = —— L/100 km
(n)
282
(n) x L/100 km = —— mpg
(n)
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