Fahrenheit to Kelvin Converter
Unit ConversionConvert Fahrenheit to Kelvin using the combined formula K = (F minus 32) times 5/9, plus 273.15.
Kelvin
Equivalent temperature in Kelvin
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SponsoredThis calculator converts a temperature in Fahrenheit to Kelvin using the combined formula: convert Fahrenheit to Celsius first, then add 273.15 to reach Kelvin. It is a less common pairing than Fahrenheit to Celsius, since Kelvin is mostly used in scientific contexts alongside Celsius, but it is genuinely useful for US-based lab work, engineering specifications, or classroom problems that mix an everyday Fahrenheit reading with a Kelvin-based calculation.
Because Kelvin has an absolute zero floor at 0 K, there is a real minimum Fahrenheit input this conversion can meaningfully handle: -459.67°F, the Fahrenheit equivalent of absolute zero. Any Fahrenheit value at or below that point is not physically possible.
For the reverse direction, or the more common Fahrenheit to Celsius conversion, see the related converters below.
Fahrenheit to Kelvin conversion table
This table covers the Fahrenheit values most likely to come up in practice, from far below freezing to a rolling boil.
| Fahrenheit | Kelvin |
|---|---|
| -459.67°F | 0 K |
| -40°F | 233.15 K |
| 0°F | 255.37 K |
| 32°F | 273.15 K |
| 68°F | 293.15 K |
| 98.6°F | 310.15 K |
| 212°F | 373.15 K |
| 500°F | 533.15 K |
The Fahrenheit to Kelvin formula
The combined formula is K = (F minus 32) times 5/9, plus 273.15. For example, 98.6°F minus 32 equals 66.6, then 66.6 times 5/9 equals 37.0, then 37.0 plus 273.15 equals 310.15 K.
This chains two conversions together: Fahrenheit to Celsius first (subtract 32, multiply by 5/9), then Celsius to Kelvin (add 273.15). If you already know the Celsius equivalent, the last step alone is all that is needed. To see all three scales side by side, use the Temperature Converter.
Why this conversion is uncommon, and when it matters
Fahrenheit and Kelvin rarely appear together directly, since Fahrenheit is used in everyday US weather and cooking contexts, while Kelvin is reserved for scientific and engineering work that almost always pairs it with Celsius instead. When this conversion is needed, it is usually because a measurement was taken with US-calibrated equipment (a Fahrenheit-scale thermometer, for instance) but needs to feed into a scientific calculation or specification that expects Kelvin.
Checking the floor
Since 0 K corresponds to exactly -459.67°F, this is a useful sanity check: if a real-world Fahrenheit reading ever converts to a Kelvin value at or below zero, that signals a data entry error or an instrument fault, not a genuine temperature, since going below absolute zero is not physically possible.
Frequently Asked Questions
What is the formula to convert Fahrenheit to Kelvin?
K equals (F minus 32) times 5/9, plus 273.15. For example, 68°F converts to 293.15 K.
What is 32 degrees Fahrenheit in Kelvin?
32°F, the freezing point of water, equals 273.15 K.
What Fahrenheit value equals absolute zero?
-459.67°F equals exactly 0 K, absolute zero, the coldest temperature that is physically possible.
What is 98.6 degrees Fahrenheit in Kelvin?
98.6°F, normal human body temperature, equals approximately 310.15 K.
Why does converting Fahrenheit to Kelvin take two steps?
Fahrenheit and Kelvin do not share a simple direct offset the way Celsius and Kelvin do. The formula first converts Fahrenheit to Celsius, then adds 273.15 to reach Kelvin.
Is there a minimum Fahrenheit value this calculator accepts?
Yes, -459.67°F, since that is the Fahrenheit equivalent of absolute zero, 0 K. A colder value is not physically possible.
When would I need to convert Fahrenheit to Kelvin?
This mainly comes up in US-based scientific, engineering, or classroom contexts where a temperature was measured in Fahrenheit but needs to be used in a calculation or specification that requires Kelvin.
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