Use the search feature to view Kepware's repository of more than 500 Knowledge Base articles. Narrow your results or type your query into the search field below.

Alternatively, if you are unable to find a solution, we have an additional resource - our PTC eSupport Portal . If you are prompted to log into the eSupport Portal, you can use your My Kepware credentials. Need a My Kepware account? Create one here .

Search Solution Results By:

## Kepware Knowledge Base: Solution

#### Temperature Scales and Conversion Formulas for Derived Tags

Last Update: 11/12/2018

Kelvin Scale
The Kelvin (K) is a unit increment of temperature, and is one of the seven SI base units. It is a thermodynamic (absolute) temperature scale where Absolute Zero (the theoretical absence of all thermal energy) is zero (0 K).

Celsius Scale

Celsius ( C) is a temperature scale named after the astronomer Anders Celsius (1701-1744), who developed a similar temperature scale two years before his death. It is also known as centigrade. A degree Celsius can refer to a specific temperature on the Celsius scale, and can also serve as a unit increment to indicate a temperature interval (which is a difference between two temperatures or an uncertainty).

Fahrenheit Scale

Fahrenheit ( F) is a temperature scale named after the physicist Daniel Gabriel Fahrenheit (1686-1736), who proposed it in 1724.

Rankine Scale

Rankine (R or Ra to distinguish it from the R mer and R aumur scales) is a temperature scale named after the physicist William John Macquorn Rankine (1820-1872), who proposed it in 1859. The Rankine scale is similar to the Kelvin scale in that zero is Absolute Zero; however, a degree Rankine is defined as equal to one degree Fahrenheit as opposed to one degree Celsius (as used by the Kelvin scale). A temperature of -459.67 F is equal to 0 R.

KelvinCelsiusFahrenheitRankine
Absolute Zero (by definition)0 K-273.15 C-459.67 F0 R
Freezing Point of Water 273.15 K0 C32 F491.67 R
Triple Point of Water [by definition]273.16 K0.01 C32.018 F491.688 R
Boiling Point of Water373.1339 K99.9839 C211.9710 F671.641 R

Conversion Formulas

• Celsius From Kelvin: [ C] = [K] - 273.15
• Kelvin from Celsius: [K] = [ C] + 273.15
• Fahrenheit from Kelvin: [ F] = [K] 9/5 - 459.67
• Kelvin from Fahrenheit: [K] = ([ F] + 459.67) 5/9
• Fahrenheit from Celsius: [F] = [C] 9/5 + 32
• Celsius from Fahrenheit: [C] = ([F] - 32) 5/9
• Rankine from Kelvin: [ R] = [K] 9/5
• Kelvin from Rankine: [K] = [ R] 5/9

Calculating Wind Chill
Wind Chill = 35.74 + 0.6215(T) - 35.75((V)^0.16) + 0.4275(T)((V)^0.16)

• T is the air temperature in degrees Fahrenheit ( F)
• V is the wind speed in Miles Per Hour (MPH)
Related Products 