Kelvin to Fahrenheit Converter
To convert Kelvin to Fahrenheit, use the formula F = (K - 273.15) × 9/5 + 32. For example, 25 Kelvin equals -414.67 Fahrenheit. Use the calculator above for instant results, or follow the formula, worked examples, and reference table below.
Formula
F = (K - 273.15) × 9/5 + 32
Use the temperature formula to convert Kelvin values to Fahrenheit.
Example Conversions
0 Kelvin (K)
-459.67 Fahrenheit (F)
1 Kelvin (K)
-457.87 Fahrenheit (F)
25 Kelvin (K)
-414.67 Fahrenheit (F)
100 Kelvin (K)
-279.67 Fahrenheit (F)
212 Kelvin (K)
-78.07 Fahrenheit (F)
Conversion Table
| Kelvin (K) | Fahrenheit (F) |
|---|---|
| 0 | -459.67 |
| 1 | -457.87 |
| 10 | -441.67 |
| 20 | -423.67 |
| 25 | -414.67 |
| 32 | -402.07 |
| 37 | -393.07 |
| 50 | -369.67 |
| 75 | -324.67 |
| 100 | -279.67 |
| 212 | -78.07 |
| 273.15 | 32 |
How to Convert Manually
Use these steps to convert Kelvin values to Fahrenheit without the calculator.
- Write down the value in Kelvin (K) that you want to convert.
- Apply the formula: F = (K - 273.15) × 9/5 + 32.
- For example, converting 10 Kelvin gives -441.67 Fahrenheit.
- Label the result as Fahrenheit (F).
About Kelvin and Fahrenheit
The kelvin is the SI base unit of thermodynamic temperature, defined since 2019 by fixing the Boltzmann constant. Its zero point is absolute zero, and one kelvin equals one degree Celsius in size. The degree Fahrenheit sets water's freezing point at 32 °F and boiling point at 212 °F, dividing the interval into 180 degrees. The US uses it for weather, cooking, and medicine. The two scales are related by the formula F = (K - 273.15) × 9/5 + 32, not a fixed factor. Kelvin to Fahrenheit conversion comes up most often in physics and chemistry calculations and in color temperature of lighting and displays, typically when figures need restating for US weather forecasts and thermostats.
Precision and Rounding: Temperature conversions are formula-based, not factor-based, so apply the full formula before rounding. Whole degrees are fine for weather and cooking; lab work, medicine, and HVAC commissioning usually carry one or two decimal places.
Conversion factors per NIST Special Publication 811 and the BIPM SI Brochure (9th edition) (reference).
Worked Example
15 Kelvin equals -432.67 Fahrenheit.
15 K -> -432.67 F
FAQ
How do I convert Kelvin to Fahrenheit?
Use the temperature formula to convert Kelvin values to Fahrenheit.
What is the formula for Kelvin to Fahrenheit?
The formula is F = (K - 273.15) × 9/5 + 32.
How many Fahrenheit are in 1 Kelvin?
1 Kelvin equals -457.87 Fahrenheit.
Can I convert Fahrenheit back to Kelvin?
Yes. 1 Fahrenheit equals 255.9277778 Kelvin, and the related converter can reverse the calculation.
What are common names for Kelvin and Fahrenheit?
Kelvin is shown as K and may also be searched as kelvin, °K. Fahrenheit is shown as F and may also be searched as fahrenheit, °F.
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