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Unit Conversion (English to SI) and Some Important Constants 
(A more comprehensive resource is the Converter TESTcalc or the Android 
app Engineering Unit Converter) 
Length/Velocity: 
1 ft = 0.3048 m; 1 in = 25.4 mm 1 mm = 1x10-3 m 
1 mile = 1.61 km 1 mile (nautical) = 1.85 km 
1 mile/hour = 0.447 m/s 1 km/hour = 0.2777 m/s 
Volume/Flow Rate: 
1 ft3 = 0.02832 m3 1 gal = 3.785 L 1 L = 1x10-3 m3 
1 in3 = 16.387 mL 1 mL = 1x10-3 L 1 quart = 0.9464 L 
1 ounce = 29.574 mL 1 pint = 0.473 L 
1 ft3/min(cfm) = 4.72x10-4 m3/s 1 gal/hour=1.0514x10-6 m3/s 
Mass: 
1 slug = 14.594 kg 1 lbm = 0.4536 kg 1 g = 1x10-3 kg 
1 ounce = 28.35 g 
1 Ton (long) = 1016 kg 1 Ton (short) = 2000 lbm = 907.1847 kg 
Force: 
1 lbf = 4.448 N 1 kgf = 9.81 N 1 N = 1x10-3 kN 
1 Ounce-Force = 0.278 N 1 Dyne = 10 mN 1 KIP = 4.44.2 kN 
Pressure: 
1 psi = 6.895 kPa 1 bar = 100 kPa 1 inch of Hg = 3.374 kPa 
1 inch of water = 0.2486 kPa 1 Torr = 1 mm of Hg 1 mm of Hg = 0.1333 kPa 
Energy/Power: 
1 Btu = 1.055 kJ 1 MJ = 1x103 kJ 1 J = 1x10-3 kJ 
1 erg = 1 mJ 1 Therm = 105.5 MJ 1 kWh = 3.6 MJ 
1 Cal (food) = 4.187 kJ 1 calorie = 4.187 J 1 kilo-calorie = 4.187 kJ 
1 Horsepower-hour = 2.6845 MJ 1 ft-lbf = 1.3558 J 
1 Btu/ft3 = 0.0373 MJ/m3 1 Btu/lbm = 2.3258 kJ/kg 1 cal/g = 4.187 kJ/kg 
1 Btu/hour = 0.2931 W 1 Horsepower = 0.7457 kW 
1 Ton of Refrigeration = 3.517 kW 
Temperature: 
? ? ? ? o T K ? T C ? 273 ? ? ? ? o ?T K ? ?T C ? ? ? ? o o T F ?1.8T C ?32 
? ? ? ? o o ?T F ?1.8?T C T ?R? ?1.8T ?K? ?T ?R? ?1.8?T ?K? 
Specific Heat: 
1 ? ? o J/ g? C =1 ? ? o kJ/ kg? C = 1 kJ/ ?kg?K? 
1 ? ? o Btu/ lbm? F =4.187 kJ/ ?kg?K? 
1 Btu/ ?lbm?R? = 4.187 kJ/ ?kg?K? 
1 Btu/ ?lbmol ?R? = 4.187 kJ/ ?kmol ?K? 
Thermal Conductivity: 
1 ? ? o W/ m? C =1 W/ ?m?K? = 1x10-3 kW/ ?m?K? 
1 ? ? o Btu/ ft ?hr ? F = 1.7307 W/ ?m?K?
Absolute and Kinematic Viscosity: 
1 Pa.s = 1 N.s/m2 = 1 kg/ ?s ?m? (absolute) 
1 poise = 0.1 Pa.s 1 lbm/ ?ft ?s? = 1.4882 Pa.s (absolute) 
1 stoke = 100 m2/s (kinematic) 
---------------------------Physical Constants---------------- 
Quantity SI Unit 
Standard temperature 25oC (298K), 
Standard pressure of air 101.325 kPa 
g 9.81 m/s2, 
R 8.314 kJ/ ?kmol ?K? 
Boltzmann constant 1.380650x10-26 kJ/K 
Avogadro constant 6.0221413x1026 per kmol 
Stephan-Boltzmann constant 5.6704x10-11 ? ? 2 4 kW/ m ?K 
Speed of light in vacuum 2.9979x108 m/s 
Speed of sound in dry air (1 atm, 0oC) 331.36 m/s 
Density of air (STP) 1.185 kg/m3 
Density of water (STP) 997 kg/m3 
Kinematic viscosity of water (20oC) 1.002 Pa s 
Heat of fusion of water (1 atm) 333.7 kJ/kg 
Enthalpy of vaporization of water (1 atm) 2256.5 kJ/kg

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Unitconversion table

  • 1. Unit Conversion (English to SI) and Some Important Constants (A more comprehensive resource is the Converter TESTcalc or the Android app Engineering Unit Converter) Length/Velocity: 1 ft = 0.3048 m; 1 in = 25.4 mm 1 mm = 1x10-3 m 1 mile = 1.61 km 1 mile (nautical) = 1.85 km 1 mile/hour = 0.447 m/s 1 km/hour = 0.2777 m/s Volume/Flow Rate: 1 ft3 = 0.02832 m3 1 gal = 3.785 L 1 L = 1x10-3 m3 1 in3 = 16.387 mL 1 mL = 1x10-3 L 1 quart = 0.9464 L 1 ounce = 29.574 mL 1 pint = 0.473 L 1 ft3/min(cfm) = 4.72x10-4 m3/s 1 gal/hour=1.0514x10-6 m3/s Mass: 1 slug = 14.594 kg 1 lbm = 0.4536 kg 1 g = 1x10-3 kg 1 ounce = 28.35 g 1 Ton (long) = 1016 kg 1 Ton (short) = 2000 lbm = 907.1847 kg Force: 1 lbf = 4.448 N 1 kgf = 9.81 N 1 N = 1x10-3 kN 1 Ounce-Force = 0.278 N 1 Dyne = 10 mN 1 KIP = 4.44.2 kN Pressure: 1 psi = 6.895 kPa 1 bar = 100 kPa 1 inch of Hg = 3.374 kPa 1 inch of water = 0.2486 kPa 1 Torr = 1 mm of Hg 1 mm of Hg = 0.1333 kPa Energy/Power: 1 Btu = 1.055 kJ 1 MJ = 1x103 kJ 1 J = 1x10-3 kJ 1 erg = 1 mJ 1 Therm = 105.5 MJ 1 kWh = 3.6 MJ 1 Cal (food) = 4.187 kJ 1 calorie = 4.187 J 1 kilo-calorie = 4.187 kJ 1 Horsepower-hour = 2.6845 MJ 1 ft-lbf = 1.3558 J 1 Btu/ft3 = 0.0373 MJ/m3 1 Btu/lbm = 2.3258 kJ/kg 1 cal/g = 4.187 kJ/kg 1 Btu/hour = 0.2931 W 1 Horsepower = 0.7457 kW 1 Ton of Refrigeration = 3.517 kW Temperature: ? ? ? ? o T K ? T C ? 273 ? ? ? ? o ?T K ? ?T C ? ? ? ? o o T F ?1.8T C ?32 ? ? ? ? o o ?T F ?1.8?T C T ?R? ?1.8T ?K? ?T ?R? ?1.8?T ?K? Specific Heat: 1 ? ? o J/ g? C =1 ? ? o kJ/ kg? C = 1 kJ/ ?kg?K? 1 ? ? o Btu/ lbm? F =4.187 kJ/ ?kg?K? 1 Btu/ ?lbm?R? = 4.187 kJ/ ?kg?K? 1 Btu/ ?lbmol ?R? = 4.187 kJ/ ?kmol ?K? Thermal Conductivity: 1 ? ? o W/ m? C =1 W/ ?m?K? = 1x10-3 kW/ ?m?K? 1 ? ? o Btu/ ft ?hr ? F = 1.7307 W/ ?m?K?
  • 2. Absolute and Kinematic Viscosity: 1 Pa.s = 1 N.s/m2 = 1 kg/ ?s ?m? (absolute) 1 poise = 0.1 Pa.s 1 lbm/ ?ft ?s? = 1.4882 Pa.s (absolute) 1 stoke = 100 m2/s (kinematic) ---------------------------Physical Constants---------------- Quantity SI Unit Standard temperature 25oC (298K), Standard pressure of air 101.325 kPa g 9.81 m/s2, R 8.314 kJ/ ?kmol ?K? Boltzmann constant 1.380650x10-26 kJ/K Avogadro constant 6.0221413x1026 per kmol Stephan-Boltzmann constant 5.6704x10-11 ? ? 2 4 kW/ m ?K Speed of light in vacuum 2.9979x108 m/s Speed of sound in dry air (1 atm, 0oC) 331.36 m/s Density of air (STP) 1.185 kg/m3 Density of water (STP) 997 kg/m3 Kinematic viscosity of water (20oC) 1.002 Pa s Heat of fusion of water (1 atm) 333.7 kJ/kg Enthalpy of vaporization of water (1 atm) 2256.5 kJ/kg