Fluid Power Services 2026-2027

Conversion Factors

FROM OLD UNIT

TO SI UNIT

CONVERSION

LENGTH Inch (in) n/16 inch Foot (ft) mile (mi)

Millimetres (mm) Millimetres (mm)

x25.4

x1.6

Metres (m)

x0.305 x1.609

Kilometres (km)

MASS Pound (lb) Ounce (oz)

Kilogramme (kg)

x0.454 x28.04

Gramme (g)

Long Ton (UK) Short Ton (USA)

Tonne (t) Tonne (t)

x1.02 x0.91

FORCE (WEIGHT) Pound-force (lbf)

Newton (N)

x9 then ÷2

TORQUE Foot Pound Force (lbf ft)

Newton-Metre (N m)

x1.36

PRESSURE lbf/in 2 (psi)

Bar

÷14.5 x100

Bar

Kilopascal (kPa) Kilopascal (kPa)

lbf/in 2 (psi)

x6.9

kgf/cm 2 or kp/cm 2

Bar Bar

x0.98

Atmosphere (standard)

x1.013

Inches Water Gauge (inH 2 0)

Millibar (mbar) Millibar (mbar)

x2.49 x1.33 x154

Millimetres of Mercury (mmHg) (Torr)

Tons/in 2

Bar

VOLUME Gallon (UK) (gal) Gallon (USA) (gal)

Litre (L) Litre (L) Litre (L) Litre (L)

x4.54 x3.79 x0.57 x0.47 x28.4 x29.6

Pint (UK) (pt) Pint (USA) (pt)

Fluid Ounce (UK) (fl oz) Fluid Ounce (USA) (fl oz)

Cubic Centimetre (cm 3 ) Cubic Centimetre (cm 3 )

FLOW Cubic Feet Per Minute (CFM) Cubic Feet Per Minute (CFM) Cubic Feet Per Minute (CFM)

Cubic Decimetres/Second (dm 3 /s) (l/sec)

x0.472

Cubic Metres/Second (m 3 /s)

x0.472 then ÷1000

Cubic Decimetres/Minute (dm 3 /s) (l/min)

x28.32

POWER Horsepower (hp) Horsepower (hp)

Watt (W)

x746

Kilowatt (kW)

x0.746

ENERGY, WORK Foot-Pound-Force (ft lbf)

Joule (J) Joule (J) Joule (J)

x1.35

Kilogramme-Force Metres (kgf m)

x9.807 x1055

British Thermal Unit (Btu)

TEMPERATURE Fahrenheit (°F)

Celsius (°C)

+40 then x5 then ÷9 then -40