How to convert kelvin to Fahrenheit?
Type a value in either box, and the answer shows it in the other unit as you type.
- Degrees Fahrenheit (°F)
- 80.33
300 K = 80.33 °F.
Degrees Fahrenheit (°F): 80.33. 300 K = 80.33 °F.
Degrees Fahrenheit (°F) by kelvins (K)
How to calculate
Converts kelvins (K) to degrees Fahrenheit (°F) and back, with the exact unit definitions.
Example with the default inputs (Kelvins (K) 300): 300 K = 80.33 °F.
Formula: °F = K × 9 ÷ 5 − 459.67
- A kelvin is 1.8 (9/5) degrees Fahrenheit, and 0 K is −459.67 °F, so the conversion multiplies, then subtracts.
- Nothing is colder than absolute zero (0 K, −273.15 °C, −459.67 °F), so a value below it gives no answer.
- Exact on the typed decimals: at most 6 decimal places (6 significant digits below 0.0001), rounded half up; an answer of 1 billion or more shows at most 15 significant digits.
Worked examples
Each example is checked against the calculator on every build.
- Kelvins (K) 0 gives Degrees Fahrenheit (°F) -459.67.Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8
- Kelvins (K) 300 gives Degrees Fahrenheit (°F) 80.33.Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8
- Degrees Fahrenheit (°F) 80.33 gives Kelvins (K) 300.Source: Exact unit definitions in NIST SP 811 (2008), Appendix B.8
Other questions people ask
What is the formula to convert kelvin to Fahrenheit?
°F = K × 9 ÷ 5 − 459.67. For example, 300 K is 80.33 °F.
How do I convert kelvin to Fahrenheit?
Use °F = K × 9 ÷ 5 − 459.67. 300 K gives 80.33 °F.
How do I convert Fahrenheit back to kelvin?
Reverse the formula, or type the degrees Fahrenheit into the second box and the converter works it out.
What is absolute zero?
0 K, the coldest possible temperature: −273.15 °C, or −459.67 °F. The kelvin scale starts there, so a temperature in kelvin is never negative, and the converter gives no answer below it.
Can I go through Celsius instead?
Yes: subtract 273.15 to get °C, then multiply by 9/5 and add 32. 300 K is 26.85 °C, and 26.85 × 9/5 + 32 = 80.33 °F, the same answer.
Is it "degrees kelvin"?
No. The unit is the kelvin, written with the symbol K and no degree sign, as in 300 K; NIST SP 811 writes T0 = 273.15 K. Celsius keeps the degree sign: 26.85 °C.