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Imperial to SI Units SI to Imperial Units Length 1inch(in)=25.4millimetres(mm) 1cm=0.394in 1foot(ft)=0.3048metre(m) 1m=3.28ft 1yard(yd)=0.914metre(m) 1m=1.09yd 1furlong(fur)=201metres(m) 1km=4.98fur 1mile=1.61kilometres(km) 1km=0.621mile Mass 1ounce(oz)=28.35grams(g) 1g=0.03527oz 1pound(lb)=0.454kilogram(kg) 1kg=2.205lb 1stone=6.35kilograms(kg) 1kg=0.157stone 1ton=1.016tonnes(t) 1t=0.984ton Area 1squareinch(in2)=6.45squarecentimetres(cm2) 1cm2=0.155in2 1squarefoot(ft2)=9.29squaredecimetres(dm2) 1dm2=0.108ft2 1squareyard(yd2)=0.836squaremetre(m2) 1m2=1.2yd2 1cre(a)=0.405hectare(ha 1ha=2.47a 1squaremile(mile2)=2.59squarekilometre(km2) 1km2=0.386mile2 Volume 1cubicinch(in3)=16.4cubiccentimetres(cm3) 1cm3=0.061in3 1cubicfoot(ft3)=0.0283cubicmetre(m3) 1m3=35.3ft3 1cubicyard(yd3)=0.765cubicmetre(m3) 1m3=1.31yd3 1bushel(bush)=0.0364cubicmetre(m3) 1m3=27.5bush Volume(fluids) 1fluidounce(floz)=28.4mililitre(ml) 1ml=0.0352floz 1pint(pt)=568(ml) 1litre=1.76pt 1gallon(UK)(gall)=4.55litre(L) 1m3=220gall Force 1pound-force(ibf)=4.45newton(N) 1N=0.225lbt 1ton-force(tonf)=9.96kilomewton(KN) 1KN=0.1tonf Pressure 1poundpersquareinch(psli)=6.89kilopanscal(kpa) 1kpa=0.145psi 1atmosphere(atm)=101kPa 1Mpa=9.87atm 1tonpersquareinch(ton/in2)=15.42megapascal(Mpa) 1Mpa=0.0649ton/in2 1inchofmercury(inHg)=33.9milibar(mb) 1mb=0.0295inHg 1(mb)=100(Pa) Veloclty 1mileperhour(mile/h)=16.1kilometreperhour(km/h) 1km/h=0.54mph 1knot(Kn)=1.852(km/h) Temperature DegreeFahrenheit(0F) 0c=5/9(Of-32) Dgreecelsius(0C)0F=9/50C+32 Density 1poundpercubicinch(ib/in3)/=27.7(g/cm3) 1g/cm3=0.0361lb/in3 1lb/in3=27.7tonnepercubicmetre(t/m3) 1t/m3=0.0361lb/in3 1tonpercubicyard(ton/yd3)/=1.33t/m3 1t/m3=0.752ton/yd3 Energy 1Bitishthemalunit(Btu)=1.06kilojoule(KJ) 1kJ=0.948Btu 1therm=106MJ1KWh=3.6MJtherm MJ=9480therm Megajoule(MJ)(kwh) Power 1housepower(hp)=0.746kilowatt(KW) 1kw=1.34hp Frequency 1cyclepersecond(c/s)=1hertz(Hz) 1HZ=1cs Angularvelocity 1revolutionperminute(rpm)=0.105radianpersecond(rdas)1d/s=9.55rpm
