Common Conversion Factors
Conversion Factors (Approximate)
Quantity
Non-SI Unit
Non-SI
To
Metric (SI) Unit
Metric (SI) Unit
Metric (SI)
To
Non-SI Units
inch (in)
millimeter (mm) or
centimeter (cm)
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
mile
kilometer (km)
1 mile = 1.61 km
1 km = 0.62 mile
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
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)
ounce (oz)
gram (g)
1 oz = 28.3 g
1 g = 0.035 oz
Length
Area
Volume
Mass
Force
Pressure
Velocity
Temperature
Density
Energy
Power
Fuel consumption
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
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
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
mile per hour (mph)
kilometer per hour (km/h)
1 mph = 1.61 km/h
1 km/h = 0.62 mph
Fahrenheit temp (˚F)
Celsius temp (˚C)
5 (˚F-32)
˚C = ————9
9 x ˚C
˚F = —-——- + 32
5
pound per cubic inch (lb/in ³)
gram per cubic centimeter (g/cm ³) = tonne
per cubic meter (t/m ³)
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
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)
horsepower (hp)
kilowatt (kW)
1 hp = 0.746 kW
1 kW = 1.34 hp
miles per gallon (mpg)
liters per 100 kilometers (L/100 km)
282
(n) x mpg = —— L/100 km
(n)
282
(n) x L/100 km = —— mpg
(n)
先進機械工程有限公司
PROFICIENCY EQUIPMENT LTD.
(泰昇集團成員 A member of Tysan Group)
香港灣仔港灣道 25 號海港中心 11 樓
11/F Harbour Centre, 25 Harbour Road, Wanchai, Hong Kong
電話 Tel: 2576 1868
傳真 Fax: 2577 8612
電子郵件 Email: [email protected]
網址 Website: www.proficiency.com.hk