Degrees Fahrenheit to Kelvin
Type a value in Degrees Fahrenheit and get the result in Kelvin, calculated exactly.
20 Degrees Fahrenheit ≈ 266.4833333 Kelvin
Exact factorRounded for display to about 10 significant digits.
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Range -25 – 50 °F = 241.483 – 283.15 K
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Formula
K = °F × 0.555555555556 + 255.372222222
To convert Degrees Fahrenheit to Kelvin, multiply the value by 0.555555555556, then add 255.372222222.
Worked examples
- 0 °F ≈ 255.3722222 K
- 20 °F ≈ 266.4833333 K
- 100 °F ≈ 310.9277778 K
This factor is exact by definition.
Conversion table
| Degrees Fahrenheit (°F) | Kelvin (K) |
|---|---|
| −40 | 233.15 |
| −30 | ≈ 238.7056 |
| −20 | ≈ 244.2611 |
| −10 | ≈ 249.8167 |
| 0 | ≈ 255.3722 |
| 5 | 258.15 |
| 10 | ≈ 260.9278 |
| 15 | ≈ 263.7056 |
| 20 | ≈ 266.4833 |
| 25 | ≈ 269.2611 |
| 30 | ≈ 272.0389 |
| 35 | ≈ 274.8167 |
| 37 | ≈ 275.9278 |
| 40 | ≈ 277.5944 |
| 50 | 283.15 |
| 60 | ≈ 288.7056 |
| 70 | ≈ 294.2611 |
| 80 | ≈ 299.8167 |
| 90 | ≈ 305.3722 |
| 100 | ≈ 310.9278 |
| 150 | ≈ 338.7056 |
| 200 | ≈ 366.4833 |
Values marked ≈ are rounded; the rest are exact.
Reverse table: Kelvin to Degrees Fahrenheit
| Kelvin (K) | Degrees Fahrenheit (°F) |
|---|---|
| −40 | — |
| −30 | — |
| −20 | — |
| −10 | — |
| 0 | −459.67 |
| 5 | −450.67 |
| 10 | −441.67 |
| 15 | −432.67 |
| 20 | −423.67 |
| 25 | −414.67 |
| 30 | −405.67 |
| 35 | −396.67 |
| 37 | −393.07 |
| 40 | −387.67 |
| 50 | −369.67 |
| 60 | −351.67 |
| 70 | −333.67 |
| 80 | −315.67 |
| 90 | −297.67 |
| 100 | −279.67 |
| 150 | −189.67 |
| 200 | −99.67 |
Unit definitions
- Degrees Fahrenheit °F
- Water freezes at 32 °F and boils at 212 °F; one degree is 5/9 of a kelvin.
- Kelvin K
- The SI base unit of temperature, starting at absolute zero.
Questions people ask
Degrees Fahrenheit to Kelvin: what is the conversion factor?
One °F is ≈ 255.9277778 K.
How do I convert Degrees Fahrenheit to Kelvin?
Use the formula above. For example, 20 °F = ≈ 266.4833333 K.
Is the conversion exact?
Yes. Both units have exact definitions, so the factor is exact; a result is only rounded when its decimals never end.
Factors checked 19 October 2026.