Fahrenheit to Kelvin Converter
Convert degrees Fahrenheit to kelvins with a two-way calculator. The formula is K = (°F − 32) × 5/9 + 273.15. The chart below covers freezing, room, body and boiling temperatures.
How to convert degrees Fahrenheit to kelvins
Worked example: convert 25 °F to K. (25 − 32) × 5/9 = -3.888889, then add 273.15 to get 269.2611 K. Reverse it with °F = (K − 273.15) × 9/5 + 32.
Degrees fahrenheit to kelvins chart
| Degrees fahrenheit (°F) | Kelvins (K) |
|---|---|
| -40 °F | 233.15 K |
| -20 °F | 244.2611 K |
| 0 °F | 255.3722 K |
| 20 °F | 266.4833 K |
| 32 °F | 273.15 K |
| 40 °F | 277.5944 K |
| 50 °F | 283.15 K |
| 60 °F | 288.7056 K |
| 68 °F | 293.15 K |
| 70 °F | 294.2611 K |
| 75 °F | 297.0389 K |
| 80 °F | 299.8167 K |
| 90 °F | 305.3722 K |
| 98 °F | 309.8167 K |
| 100 °F | 310.9278 K |
| 120 °F | 322.0389 K |
| 150 °F | 338.7056 K |
| 212 °F | 373.15 K |
| 250 °F | 394.2611 K |
| 350 °F | 449.8167 K |
| 400 °F | 477.5944 K |
| 450 °F | 505.3722 K |
Kelvins to degrees Fahrenheit (reverse)
| Kelvins (K) | Degrees fahrenheit (°F) |
|---|---|
| 0 K | -459.67 °F |
| 100 K | -279.67 °F |
| 200 K | -99.67 °F |
| 250 K | -9.67 °F |
| 255 K | -0.67 °F |
| 273 K | 31.73 °F |
| 273.15 K | 32 °F |
| 280 K | 44.33 °F |
| 290 K | 62.33 °F |
| 293.15 K | 68 °F |
| 300 K | 80.33 °F |
| 310 K | 98.33 °F |
About the degree Fahrenheit and the kelvin
On the Fahrenheit scale water freezes at 32 degrees and boils at 212 degrees, so there are 180 degrees between the two. It is the everyday scale for weather, cooking and body temperature in the United States and a few other places.
Kelvin is the SI base unit of temperature and starts at absolute zero, so it has no negative values. A change of one kelvin equals a change of one degree Celsius. Scientists and engineers use it for gas laws, color temperature and cryogenics.
Zero degrees Fahrenheit is 255.3722 K, and 100 °F is 310.9278 K.
Everyday sizes in degrees Fahrenheit and kelvins
| Everyday example (approximate) | In degrees Fahrenheit | In kelvins |
|---|---|---|
| The coldest air temperature ever recorded | -128.56 °F | 183.95 K |
| A home freezer | -0.4 °F | 255.15 K |
| Water freezes | 32 °F | 273.15 K |
| A fridge | 39.2 °F | 277.15 K |
| A comfortable room | 69.8 °F | 294.15 K |
| A hot summer day | 95 °F | 308.15 K |
| Normal human body temperature | 98.6 °F | 310.15 K |
| A hot bath | 104 °F | 313.15 K |
Degrees fahrenheit to kelvins FAQ
What is 0 °F in K?
0 °F equals 255.3722 K. For reference, 100 °F equals 310.9278 K.
How do I convert degrees Fahrenheit to kelvins without a calculator?
convert 25 °F to K. (25 − 32) × 5/9 = -3.888889, then add 273.15 to get 269.2611 K. Reverse it with °F = (K − 273.15) × 9/5 + 32. Convert to Celsius first (subtract 32, then multiply by 5/9), then add 273.15. Body temperature, 98.6 °F, is 310.15 K.
What is a hot summer day in kelvins?
A hot summer day is about 95 degrees Fahrenheit, which is 308.15 kelvins. Treat that as an approximate everyday figure rather than an official measurement.
Which scale does my country use, degrees Fahrenheit or kelvins?
Fahrenheit is used mainly in the United States and a few smaller countries; one Fahrenheit degree is 5/9 of a Celsius degree. Kelvin has no degree sign and starts at absolute zero (-273.15 °C); it is the same everywhere.