Online Fahrenheit to Kelvin conversion

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Fahrenheit to Kelvin conversion

Kelvin: K

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Fahrenheit to Kelvin

Fahrenheit and Kelvin are both units of measurement for temperature. Fahrenheit is often used for surface temperatures in the United States, and Kelvin is often used for scientific equations and calculations. It’s possible to convert temperatures from Fahrenheit to Kelvin, and vice versa. There are two ways that you can make the conversion, either converting directly to Kelvin, or converting to Celsius and then converting that measurement to Kelvin.


The Fahrenheit (symbol: °F) is a unit of temperature that was widely used prior to metrication. It is currently defined by two fixed points: the temperature at which water freezes, 32°F, and the boiling point of water, 212°F, both at sea level and standard atmospheric pressure. The interval between the freezing and boiling point is divided into 180 equal parts.


The kelvin (symbol: K) is the base unit of thermodynamic temperature in the International System of Units (SI). It is defined as the energy equivalent of the triple point of water as given by Boltzmann's equation. It is also the unit of the Kelvin scale in which the null point (0 K) is the temperature at which all thermal motion ceases, known as absolute zero, or -273.15°C. The definition of the kelvin was changed in 2019. This new definition results in a fundamental change in the kelvin, such that it is now dependent on the definitions of the second, the meter, and the kilogram.

How to Convert Fahrenheit to Kelvin

K = 5/9(F + 459.67)

F = 9/5(K - 459.67)


Convert 50 °F to K:

50 °F = (50 + 459.67) × 5/9 = 283.15

Setting Fahrenheit and Celsius Equal

Rather than converting one temperature to another (which is not helpful because it assumes you already know the answer), you can set degrees Celsius and degrees Fahrenheit equal to each other using the conversion formula between the two scales:

°F = (°C * 9/5) + 32

°C = (°F - 32) * 5/9

It does not matter which equation you use; simply use x instead of degrees Celsius and Fahrenheit. You can solve this problem by solving for x:

°C = 5/9 * (°F - 32)

x = 5/9 * (x - 32)

x = (5/9)x - 17.778

1x - (5/9)x = -17.778

0.444x = -17.778

x = -40 degrees Celsius or Fahrenheit

Working using the other equation, you get the same answer:

°F = (°C * 9/5) + 32

°x - (°x * 9/5) = 32

-4/5 * °x = 32

°x = -32 * 5/4

x = -40°


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