Conversion Charts

Temperature Conversion Chart

To convert a temperature from Fahrenheit to Centigrade, locate the number in the center column corresponding to the temperature in degrees Fahrenheit and read the equivalent temperature in degrees Centigrade from the left column. Follow the same procedure to convert from Centigrade to Fahrenheit, but read the equivalent temperature in degrees Fahrenheit from the right column.

Temperature Conversion Formulas

• Fahrenheit °F = 1.8°C + 32
• Centigrade °C = (°F – 32) / 1.8

Absolute Temperature Conversion Formulas

• Rankine °R = °F + 459.7
• Kelvin °K = °C + 273.2

Metric Conversion Table

Length

• 1 in = 25.4 mm = 2.54 cm
• 1 m = 39.37 in
• 1 cm = 0.3937 in

Area

• 1 ft2 = 0.0929 m2*
• 1 in2 = 645 mm2*

Mass

• 1 lb = 0.45359 kilogram (kg)

Volume

• 1 in3* = 0.0163871 Liter (L) = 16.4 mL
• 1 ft3 = 7.48055 gal = 28.317 L = 0.028317 m3*
• 1 gal = 3.7854 L = 0.0037854 m3*

Energy

• 1 ft-lb = 1.3558 joules (J)
• 1 calorie = 4.184 J
• 1 Btu = 1.05435 kJ
• Btu/hr = cfm x T in °F x 1.10 (air)
• Btu/hr = gpm x T in °F x 500.4 (water)

Density

• 1 lb/ft3 = 16.018463 kg/m3 *
• 1 lb/gal = 119.827 kg/m3*

Specific Heat or Entropy

• 1 Btu/(lb x °F) = 4.184 kJ/(kg x °C)

Enthalphy

• 1 Btu/lb = 2.3244 kJ/kg

Temperature

• °F = 1.8C + 32
• °C = (F – 32) / 1.8

Pressure

• 1 psi = 6.8948 kilo-Pascals (kPa)
• 1 bar 100 kPa = 14.504 psi
• 1 in of Hg (60°F) = 3.38 kPa
• 1 in of H2O (60°F) = 249 Pa*
• 1 ft of H2O = 2.99 kPa*

Flow

• 1 cfm = 0.472 L/s = 0.000472 m3/s*
• 1 gpm = 0.0631 L/s = 0.0000631 m3/s*

Velocity

• 1 fpm = 0.00508 m/s

* This equation contains subscripts or superscripts which may not be supported by all web browsers. Contact your Kele Sales Representative if there are any questions about this formula.