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Temperature
Fahrenheit to Kelvin
Convert Fahrenheit (°F) to Kelvin (K). Type a value below to see the result update instantly. Reference table and formula included.
Calculator
1 °F = 255.93 K
Fahrenheit to Kelvin Conversion Table
Common values, ready to copy:
| Fahrenheit | Kelvin |
|---|---|
| 1 °F | 255.93 K |
| 2 °F | 256.48 K |
| 5 °F | 258.15 K |
| 10 °F | 260.93 K |
| 25 °F | 269.26 K |
| 50 °F | 283.15 K |
| 100 °F | 310.93 K |
| 1,000 °F | 810.93 K |
Formula
K = (°F − 32) × 5/9 + 273.15
Temperature scales differ in both unit size and zero point, so the conversion involves both a multiplier and an offset. Celsius and Kelvin share the same degree size; Fahrenheit's degree is 5/9 the size of a Celsius/Kelvin degree.
About Fahrenheit and Kelvin
Fahrenheit (°F): Daniel Gabriel Fahrenheit introduced his scale in 1724 with three reference points (a brine solution at 0°F, water freezing at 32°F, human body temperature near 96°F), giving 180° between water's freezing and boiling. Common uses: US weather, US cooking, and a few non-US holdouts (Belize, Liberia, the Cayman Islands); dominant in US daily life despite the rest of the world having moved to Celsius.
Kelvin (K): Proposed by William Thomson (Lord Kelvin) in 1848 as an absolute scale with zero at the lowest possible temperature; uses the same degree size as Celsius, just shifted by 273.15. Common uses: Physics (thermodynamics, ideal gas law), chemistry, astronomy (stellar temperatures), and lighting design (color temperature of bulbs in Kelvin).
How the conversion works
Temperature scales differ in both unit size and zero point, so the conversion involves both a multiplier and an offset. Celsius and Kelvin share the same degree size; Fahrenheit's degree is 5/9 the size of a Celsius/Kelvin degree.
The exact relationship is K = (°F − 32) × 5/9 + 273.15, which the calculator at the top of this page applies in both directions. Type into either field and the other updates immediately.
When this conversion matters
Converting between Fahrenheit and Kelvin comes up wherever temperature measurements move between systems — from one country's conventions to another's, from a scientific reference to a practical specification, or from one industry's working unit to another's. The calculator and reference table above cover the everyday range; for unusual values you can type any number into either field.