Temperature
°FtoK
Convert degrees Fahrenheit (°F) to kelvin (K).
Converter
°F
Accepts numbers or expressions, e.g. 150 + 14.7
Result
K
Rendered to 6 significant figures.
Formula
Formula
K = (°F − 32) × 5⁄9 + 273.15
Temperature conversions involve different scale zero-points, so a single multiplicative factor does not exist. Apply the formula to each value individually.
Worked example
Convert 32 °F to K.
- 0132 − 32 = 0.0000
- 020.0000 × 5⁄9 = 0.0000
- 030.0000 + 273.15 = 273.1500 K
Result32 °F = 273.15 K
Conversion table
| °F | K |
|---|---|
| -40 | 233.15 |
| 0 | 255.37 |
| 32 | 273.15 |
| 50 | 283.15 |
| 68 | 293.15 |
| 100 | 310.93 |
| 200 | 366.48 |
| 300 | 422.04 |
| 500 | 533.15 |
| 1000 | 810.93 |
Reference values rounded to 5 significant figures for display.
FAQ
What is the formula to convert °F to K?
Temperature conversions are not a single multiplier because the scales have different zero points. Use K = (°F − 32) × 5⁄9 + 273.15 to convert any value of °F to K.
How do I convert 1 °F to K?
1 °F corresponds to 255.928 K. Apply the formula K = (°F − 32) × 5⁄9 + 273.15 to your value.
How do I convert K back to °F?
Use the inverse formula. For example, to go from K back to °F, rearrange K = (°F − 32) × 5⁄9 + 273.15 for °F. See the K to °F page for the direct formula.
When would I need to convert degree Fahrenheit to kelvin?
Temperature scale conversions are routine in process engineering: instrumentation often reads in °C or °F, while thermodynamic calculations (gas laws, enthalpy) require absolute units (K or °R). Always use absolute units for any equation involving a ratio of temperatures.
Is the conversion exact?
Yes — the temperature scale relationships are exact by definition (the Celsius–Kelvin offset is 273.15 exactly; the Fahrenheit–Rankine offset is 459.67 exactly).