Conversion Factors & Equivalents

1 Atmosphere = 760 mm of mercury
1 Atmosphere = 33.91 ft of water (4°C)
1 Atmosphere = 29.92 in. of mercury (0°C)
1 Atmosphere = 14.969 psi
1 Bar = 0.9869 atmosphere
1 British thermal unit = 777.6 foot-lbs
1 British thermal unit = 252.0 gram-calories
1 British thermal unit = 1054.8 joules
1 British thermal unit = 0.2930x10 kilowatt hours
1Btu\hr = 0.2930 watts
1 Btu\hr° ft² F deg = 2.0345x10°³ watts/in ²F deg
  = 5.678x10 4 watts/cm² °C

Celsius

= (1.8°C) + 32 Fahrenheit
1 Centimetre = 0.3937 inches
1 Centimetre of mercury (0°C) = 0.4460 feet of water
  = 0.1934 pounds/sq in.
1 Circular mil = 0.7854 square mils
1 Cubic centimetre = 0.06102 cubic inches
1 Cubic foot = 1728 cubic inches
  = 0.02832 cubic metres
  = 28.32 litres
  = 7.481 gallons
1 Cubic foot/min = 0.472 litres/sec
1 Cubic foot/sec = 448.8 gallons/min
1 Cubic inch = 16.387 cubic cm
  = 0.016387 litres
1 Cubic meter = 35.31 cubic feet
  = 1.308 cubic yards
  = 264.2 gallons
  = 1000.0 litres
CFM x 0.000472 = m³/s  
1 Erg = 1.0 cm-dynes
Fahrenheit = (F - 32)\1.8 Celsius
1 Foot = 0.3048 meters
1 Foot of water (68 F) = 0.4335 lb/sq in
1 Foot\min = 0.01136 miles/hr
1 Foot - pound = 1.383 x 10 4 cm-grams
  = 1.356 joules
FPM x = m/s  
1 Gallon = 231.0 cubic inches
  = 3.785 litres
  = 8.346 lb of water (68 F)
1 Gram = 0.3527 ounces (avdp)
  = 2.205 x 10°³ pounds
1 Gram-calorie = 3.969 x 10°³ Btu
  = 1.163 x 10°³ watt-hours
1 Horsepower = 42.41 Btu/min
  = 33 000 ft-lb/min
  = 550 ft-lb/sec
  = 0.7457 kilowatts
1 Inch = 25.40 milimetres
  = 1.133 ft of water
1 Inch of mercury = 0.4912 lb/sq in
  = 0.03453 kg/sq cm
1 Inch of water (0°C) = 0.07361 inches of mercury
  = 0.03613 lb/sq in
Inches WG x 250 = N/m²  
1 Joule = 9.480 x 10 4 Btu
  = 0.7376 tf-lb
  = 2.389 x 10 4 kg-calories
  = 2.778 x 10 4 watt hours
1 Kilogram = 2.205 pounds
1 Kilogram/sq cm = 0.9678 atmosphere
  = 32.81 feet of water
  = 28.96 inches of mercury
1 Kilogram-calories = 3.969 Btu
  = 3087 ft-lb
  = 4186 joules
1 Kilometre = 3281 feet
  = 0.6214 miles
1 Kilometre/hr = 54.68 feet/min
1 Kilowatt = 56.89 Btu/min
  = 1.341 horsepower
1 Kilowatt-hr = 3413 Btu
  = 3.6 x 10 6 joules
  = 860 kilogram-calories
1 Meter = 3.281 feet
  = 39.37 inches
  = 1.094 yards
1 Mile (nautical) = 6080 feet
1 Mile (standard) = 5280 feet
1 Mile/hr = 88.0 feet/min
1 mm = 0.03937 inches
  = 39.37 miles
1 Newton / Sq meter = 1.0 pascals
1 Ounce = 28.35 grams
  = 0.0625 pounds
1 Pint (liquid) = 473.2 cubic cm
  = 28.87 cubic inches
  = 0.4732 litres
1 Pound = 7000 grains
  = 453.6 grains
  = 4.448 newtons
  = 0.4536 kg
1 sq cm = 0.1550 sq inches
1 sq foot = 144.0 sq inches
  = 0.09290 sq meters
1 sq inch = 6.452 sq cm
  = 406 sq mils
1 sq meter = 10.764 sq feet
  = 1.1960 sq yards
1 sq mm = 0.1550 sq inches
1 sq yard = 9.0 sq feet
  = 0.8361 sq meters
TEMPERATURE:      
Kelvin = Celsius + 273  
Rankine = Fahrenheit + 460  
1 Ton (Long) = 1016 kg
  = 2240 pounds
1 Ton (Short) = 907.2 kg
  = 2000 pounds
1 Ton (Refrigeration) = 12 000 Btu/hr
  = 3.517 kilowatt-hr
  = 12.65 megajoules
1 Ton (Metric) = 1000 kg
  = 2205 pounds
1 Torr = 1.0 mm hg
1 Watt = 3.413 Btu/hr
  = 0.8598 kg-calories/hr
1 Watt-second = 1.0 joule
  = 0.8598 kg-calories/hr
       
       
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