Conversion Tables Metric Units Quantity Unit Symbol Length metre m Mass kilogram kg Time second s Electric Current ampere A Thermodynamic Temperature kelvin K Luminous intensity candela cd Amount of substance only used in physical chemistry mole mol Force newton N Energy joule J Frequency hertz Hz Pressure and stress pascal Pa Power watt W Quantity of electricity coulomb C Electric potential volt V Electric Capacitance Farad F Electric resistance ohm Ω Electric conductance siemens S Magnetic flux weber Wb Inductance henry H Luminous flux lumen lm Illuminance lux lx Units of Conversion Factors Measurement Equals 1 ft of water Pressure of 0.434 lb/sq in 1 m of water Pressure of 1.43 lb/sq in 2.31 ft of water Pressure of 1 lb/sq in 34 ft of water 1 atmosphere (14.7 lb/sq in) Pressure in atmosphere 62.39 lb One cu ft of water 62.39 lb One cu ft of salt water 64 lb (or 1/35th ton) Temperature: Fahrenheit to Celcius (Centigrade) ° F ° C ° F ° C ° F ° C 212 100 100 37.7 45 7.2 200 93.3 95 35 40 4.4 190 87.7 90 32.2 35 1.7 180 82.2 85 29.4 32 0.0 170 76.6 80 26.7 30 -1.1 160 71.1 75 23.9 25 -3.9 150 65.5 70 21.1 20 -6.7 140 60 65 18.3 15 -9.4 130 54.4 60 15.6 10 -12.2 120 48.8 55 12.8 5 -15.0 110 43.3 50 10.0 0 -17.7 Conversion Factors and Tables To Convert Multiply By   To Convert Multiply By Areas   Power  sq in to sq mm  645.16    horsepower to kW  0.7457  sq in to sq cm  6.4516    hp to metric hp  1.014  sq ft to sq m  0.0929    metric hp to kW  1.341  sq yd to sq m  0.8361    kW to hp  1.342  acres to sq m  4046.86    metric hp to hp  0.9862  acres to sq yd  4840    kW to metric hp  1.359  sq mm to sq in  0.00155   Force  sq m to sq ft  10.76    1 bf to N  4.4482  sq m to sq yd  1.196    kgf to N  9.8066  sq m to acres  0.000247    N to 1bf  0.2248  sq yd to acres  0.0002    N to kgf  0.101972 Pressure   Mass  lb/sq in to kg/sq m  0.0703    oz to grams  28.35  lb/sq ft to kg/sq m  4.88    lb to kg  0.4536  lb/sq in to ft of water  2.31    tons to tonnes (1000kg)  1.016  lb/sq in to atmospheres  0.068    tons to short (US) tons  1.12  kg/sq cm to lb sq in  14.22    grams to oz  0.0353  kg/sq m to lb/sq ft  0.205    kg to lb  2.205  ft of water to lb/sq in  0.433    tonnes to tons (2240 lb)  0.9842  atmospheres to lb/sq in  14.7    short (US) tons to tons  0.893 Speed   Distance  ft/sec to m/sec  0.3048    in to mm  25.4  ft/sec to knots  0.592    in to cm  2.54  ft/sec to miles/hr  0.682    ft to m  0.3048  ft/m to m/sec  0.0051    yd to m  0.914  knots to miles/hr  1.1515    fathomes to m  1.8288  miles/hr to km/hr  1.6093    statute miles to km  1.609  knots to km/hr  1.852    nautical miles to statute  1.1515  m/sec to ft/sec  3.281    mm to in  0.0394  knots to ft/sec  1.689    cm to in  0.394  miles/hr to ft/sec  1.467    m to ft  3.2808  m/sec to ft/min  196.8    m to yd  1.094  miles/hr to knots  0.868    m to fathoms  0.5468  km/hr to miles/hr  0.6214    kn to statute  0.6215  km/hr to knots  0.54    statue miles to naut  0.8684 Volumes   Torque  cu in to cu cm  16.387    lb ft to Nm  1.3558  cu ft to cu m  0.0283    kgf m to Nm  9.8066  cu ft to gals  6.25    lbf ft to kgf m  0.1383  cu ft to litres  28.33    Nm to lbf ft  0.7376  pints to litres  0.568    Nm to kgf m  0.102  gals to litres  4.546    kgf m to lbf ft  7.233  Imp gals to US gals  1.2    US barrels to cu m  0.16    cu cm to cu in  0.061    gals to cu ft  0.16    litres to cu ft  0.035    litres to pints  1.76    litres to gals  0.22    US gals to Imp gals  0.833