ConvBolt — Unit ConverterDegrees Fahrenheit to Kelvin Converter
Converting degrees Fahrenheit to kelvin is a multiplication by a fixed factor: 1 °F = 255.9278 K. The table below covers the values people look up most often, and the formula section shows exactly where that factor comes from.
Because the two scales have different zero points, not just different step sizes, this pair is the one people most often get wrong by treating it as a simple multiply.
Kelvin and the degree scales differ by an offset, not a ratio: 255.3722 K corresponds to 0 °F, so the arithmetic is a shift plus a scale step. That offset is also why a small rounding error in fahrenheit can look alarming once it is restated in kelvin — the number you see is the sum of two operations, not one.
Degrees Fahrenheit to Kelvin formula
Use this formula to convert any fahrenheit value to kelvin:
Worked example: 100 °F × 255.9278 = 310.9278 K.
Degrees Fahrenheit to Kelvin conversion table
| Degrees Fahrenheit (°F) | Kelvin (K) |
|---|---|
| -40 °F | 233.15 K |
| 0 °F | 255.3722 K |
| 10 °F | 260.9278 K |
| 20 °F | 266.4833 K |
| 30 °F | 272.0389 K |
| 37 °F | 275.9278 K |
| 50 °F | 283.15 K |
| 100 °F | 310.9278 K |
| 150 °F | 338.7056 K |
| 200 °F | 366.4833 K |
| 300 °F | 422.0389 K |
How to convert degrees Fahrenheit to kelvin
Multiply the fahrenheit value by 255.9278 to get the equivalent in kelvin. This single factor works for every value in the table above and for anything else you need — there is no per-value adjustment, which is why a conversion table and a calculator always agree.
If you need the opposite direction, use the Kelvin to Degrees Fahrenheit converter instead of dividing by hand; both pages use the same source factors. For every other °F conversion in one place, see the °F conversion hub.
Frequently asked questions
How many kelvin are in 1 fahrenheit?
1 fahrenheit = 255.9278 K.
What is 100 degrees Fahrenheit in kelvin?
100 °F = 310.9278 K.
Is converting degrees Fahrenheit to kelvin the same as kelvin to degrees Fahrenheit?
No — the direction changes the multiplier. The reverse conversion (1 K = -457.87 °F) is on the Kelvin to Degrees Fahrenheit page.
Related conversions
Try the ConvBolt Unit Converter for any other temperature unit, browse the Temperature conversions, or read our conversion guides.