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Engineering Constants & Conversions

 

 

 

Area
Physical Quantity... Units Mult. By... To Convert To... Units
Square Centimeters (cm2) .155 Square Inches (in2)
Square Feet (ft2) .0929 Square Meters (in2)
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Density
Physical Quantity... Units Mult. By... To Convert To... Units
Grams/Cubic Centimeter (g/cm3) .03613 Pounds/Cubic Inch (lb/in3)
Kilograms/Cubic Meter (g/m3) .06243 Pounds/Cubic Foot (lb/ft3)
Pounds/Cubic Foot (lb/ft3) 16.018 Kilograms/Cubic Meter (kg/m3)
Pounds/Cubic Inch (lb/in3) .5787 X 10-3 Pounds/Cubic Foot (lb/ft3)
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Energy
Physical Quantity... Units Mult. By... To Convert To... Units
British Thermal Units (BTU) .2931 Watt-Hours (WH)
British Thermal Units (BTU) .393 X 10-3 Horsepower-Hours (Hp-hr)
British Thermal Units (BTU) 1055 Joules (J)
Calories (cal) 4.187 Joules (J)
Foot-Pounds (ft-lb) .3766 X 10-3 Watt-Hours (WH)
Horsepower-Hours (Hp-hr) .7457 Kilowatt-Hours (KWH)
Horsepower-Hours (Hp-hr) 1.98 X 106 Foot-Pounds (ft-lb)
Horsepower-Hours (Hp-hr) 2.6845 X 106 Joules (J)
Joules (J) .2778 X 10-3 Watt-Hours (WH)
Joules (J) .3725 X 10-6 Horsepower-Hours (Hp-hr)
Kilowatt-Hours (KWH<) 3412 British Thermal Units (BTU)
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Heat Capacity/Transfer

Physical Quantity... Units Mult. By... To Convert To... Units
(British Thermal Units) /
(Hour-Foot-°F)		 (BTU)/
hr-ft-°F 		1.7307 Watts/Meter-°C (W/m-°C)
(British Thermal Units-Inches) /
(Hour-Square Foot-°F) 		(BTU-in)/
hr-ft2-°F 		.08333 (British Thermal Units-Feet) /
(Hour-Square Foot-°F) 		(BTU-ft)/
hr-ft2-°F
(British Thermal Units-Inches) /
(Hour-Square Foot-°F) 		(BTU-in)/
hr-ft2-°F 		14.42 Watts-Centimeters /
Square Meter-°C 		(W-cm)/
m2-°C
British Thermal Units /
Hour-Square Inch 		(BTU)/
hr-in2 		.04542 Watts/Square Centimeter (W/cm2)
Watts/Square Centimeter (W/cm2) 6.4516 Watts/Square Inch (W/in2)
Watts/Meter-°C (W/m-°C) .5778 (British Thermal Units) /
(Hour-Foot-°F) 		(BTU)/
hr-ft-°F
Watts/Meter-°C (W/m-°C) 6.9336 (British Thermal Units-Inches) /
(Hour-Square Foot-°F) 		(BTU-in)/
hr-ft2-°F
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Length
Physical Quantity... Units Mult. By... To Convert To... Units
Centimeters (cm) .3937 Inches (in)
Feet (in) .3048 Meters (in)
Millimeters (mm) .03937 Inches (in)
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Mass
Physical Quantity... Units Mult. By... To Convert To... Units
Gram (g) .03527 Ounces (oz)
Kilogram (kg) 2.205 Pounds (lb)
Pound (lb) 453.6 Grams (g)
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Power
Physical Quantity... Units Mult. By... To Convert To... Units
British Thermal Units/Hour (BTU/hr) .393 X 10-3 Horsepower (Hp<)
British Thermal Units/Hour (BTU/hr) .2931 Joules/Second (J/s)
British Thermal Units/Hour (BTU/hr) .2931 Watts (W)
Horsepower (Hp<) .746 Kilowatts (KW)
Horsepower (Hp<) 746 Joules/Second (J/s)
Kilowatts (KW<) 1.341 Horsepower (Hp)
Kilowatts (KW<) 3412 British Thermal Units/Hour (BTU/hr)
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Pressure
Physical Quantity... Units Mult. By... To Convert To... Units
Atmosheres (atm<) 1.01325 Bar  
Atmosheres (atm<) 10,332.3 Kilograms/Square Meter (kg/m2)
Atmosheres (atm<) 101,325 Kilopascals (KPa)
Atmosheres (atm<) 14.696 Pounds/Square Inch (psi)
Atmosheres (atm<) 29.921 Inches Mercury (in Hg)
Atmosheres (atm<) 33.934 Feet of Water (ft H2O)
Atmosheres (atm<) 760 Millimeters Mercury (mm Hg)
Atmosheres (atm<) 760 Torr  
Bar   14.504 Pounds/Square Inch (psi)
Pounds/Square Inch (psi) 703.07 Kilograms/Square Meter (kg/m2)
Pounds/Square Inch (psi) .0703 Kilograms/Square Centimeter  
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Speed/Velocity
Physical Quantity... Units Mult. By... To Convert To... Units
Centimeters/Second (cm/s) .03281 Feet/Second (fps)
Feet/Minute (fpm) .011364 Miles/Hour (mph)
Feet/Second (fps) .3048 Meters/Second (m/s)
Miles/Hour (mph) 1.609 Kilometers/Hour (km/hr)
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Volumetric Flow Rate
Physical Quantity... Units Mult. By... To Convert To... Units
Cubic Centimeters/Second (cm3)/s 60 X 10-6 Cubic Meters/Minute (m3/min)
Cubic Feet/Hour (cm3/hr) .12468 Gallons/Minute (gpm)
Cubic Meters/Minute (m3/min) 264.18 Gallons/Minute (gpm)
Gallons/Minute (gpm) .06308 Liters/Second (l/s)
Gallons/Minute (gpm) .22713 Cubic Meters/Hour (m3/hr)
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