Temperature Tool

Fahrenheit to Kelvin Converter

K equals F minus thirty-two, times five-ninths, plus two hundred seventy-three point one five.
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Fahrenheit (°F) → Kelvin (K):

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About this conversion

Fahrenheit to Kelvin is a two-step conversion: shift to Celsius first (subtract 32, scale by 5/9), then add 273.15 for the absolute scale. Common when a U.S.-sourced temperature reading needs to feed into a scientific equation that requires Kelvin.

Fahrenheit to Kelvin Reference Table

Fahrenheit (°F)Kelvin (K)
-459.670
-200144.26111
-100199.81667
-40233.15
0255.37222
32273.15
50283.15
70294.26111
77298.15
98.6310.15
100310.92778
150338.70556
200366.48333
212373.15
300422.03889
400477.59444
500533.15
750672.03889
1000810.92778
15001088.7056
20001366.4833

When to use Fahrenheit → Kelvin

  • Plugging a U.S. weather or HVAC reading into the ideal gas law (PV = nRT)
  • Converting Fahrenheit-quoted environmental data for spectroscopy or rate calculations
  • Cross-checking thermodynamic engineering results against a metric scientific source

How to Convert Fahrenheit to Kelvin

A room is 77°F. What is that in Kelvin?

  1. Start with the Fahrenheit value: F = 77.
  2. Subtract 32: 77 − 32 = 45.
  3. Multiply by 5/9: 45 × 5/9 = 25.
  4. Add 273.15: 25 + 273.15 = 298.15.
  5. So 77°F = 298.15 K.

298.15 K (25°C / 77°F) is the IUPAC standard ambient temperature, so this conversion lands on a value that shows up frequently in thermodynamic tables.

Frequently Asked Questions

What is the formula to convert Fahrenheit to Kelvin?

K = (F − 32) × 5/9 + 273.15. Subtract 32, scale by 5/9 to get Celsius, then add 273.15 for the absolute scale.

What is 32°F in Kelvin?

32°F = 273.15 K. The freezing point of water on the absolute scale.

What is 212°F in Kelvin?

212°F = 373.15 K. The boiling point of water at standard pressure.

What is 0°F in Kelvin?

0°F ≈ 255.37 K. About -17.78°C — typical of a cold winter day.

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