Multiply kelvin by 9/5 and subtract 459.67 to get Fahrenheit. Engineers in the U.S. working with SI data use this often.
How to use the Kelvin to Fahrenheit Converter
- Type the number of kelvins into the Kelvins field. Decimals such as 150 are fine.
- Read the answer in Degrees Fahrenheit. It updates as you type, with no button to press. The same amount is also shown in °C, °R.
- To go from degrees Fahrenheit back to kelvins, type into the Degrees Fahrenheit field instead. Every field also has a unit menu with all 8 temperature units, for example °C, °R, °Ré, °De, °N.
Results update as you type, and everything is calculated in your browser.
How it works
Kelvins and degrees Fahrenheit use different zero points as well as different sized degrees, so this is not a simple multiplication: the calculator applies the formula °F = K × 9/5 − 459.67, which first scales the value and then shifts it by the offset between the two zero points. Going back uses the inverse, K = (°F − -459.67) ÷ 1.8. Results are calculated at full precision and rounded only for display, so typing into either field gives consistent values.
How to convert kelvins to degrees Fahrenheit
- Start with the value in kelvins: 300 K.
- Apply the formula °F = K × 9/5 − 459.67.
- The result is 80.33 °F.
- To go back, use K = (°F − -459.67) ÷ 1.8.
K to °F conversion table
| Kelvins | Degrees Fahrenheit | Degrees Fahrenheit | Kelvins |
|---|---|---|---|
| 0 K | -459.67 °F | -459.67 °F | -5.684342 × 10-14 K |
| 77 K | -321.07 °F | 0 °F | 255.37222 K |
| 255.37 K | -0.004 °F | 32 °F | 273.15 K |
| 273.15 K | 32 °F | 70 °F | 294.26111 K |
| 293.15 K | 68 °F | 212 °F | 373.15 K |
| 300 K | 80.33 °F | ||
| 310.15 K | 98.6 °F | ||
| 373.15 K | 212 °F | ||
| 500 K | 440.33 °F | ||
| 1,000 K | 1,340.33 °F |
Temperature units explained
- Kelvin (K)
- The kelvin is the SI unit of temperature. It starts at absolute zero, the coldest possible temperature, and has the same step size as the degree Celsius.
- Degree Fahrenheit (°F)
- The Fahrenheit scale, proposed by Daniel Fahrenheit in 1724, puts water’s freezing point at 32 °F and boiling point at 212 °F. It is the everyday scale in the United States.
Common mistakes to avoid
Forgetting the offset (°F is not just °C × 1.8), converting temperature differences with the full formula (a change of 10 °C is a change of 18 °F, with no +32), and writing “degrees kelvin”.
Formula
°F = K × 9/5 − 459.67
Worked example
Inputs: Kelvins: 300 K.
Results: Degrees Fahrenheit = 80.33 °F; Degrees Celsius = 26.85 °C; Degrees Rankine = 540 °R.
Frequently asked questions
What is 300 K in Fahrenheit?
80.33 °F.
What is absolute zero in Fahrenheit?
−459.67 °F.
How do I convert kelvins to degrees Fahrenheit?
Use °F = K × 9/5 − 459.67. For example, 300 K = 80.33 °F.
How do I convert degrees Fahrenheit back to kelvins?
Use K = (°F + 459.67) × 5/9, or type the value into the degrees Fahrenheit field above.
What is 1,000 K in degrees Fahrenheit?
1,000 K = 1,340.33 °F.
Is the kelvins to degrees Fahrenheit conversion exact?
Yes. The official definitions (NIST and the SI) fix 1 K = -457.87 °F exactly, so the only difference you may see is rounding in the last displayed digit.
Sources
Guides on this topic
- Celsius to Fahrenheit: Formula, Mental Shortcuts and Reference Table: The exact °C to °F formula and why it has two steps, a mental trick that is never wrong, a table of everyday temperatures and how kelvin fits in.