20 °F = 266.483 K (degree Fahrenheit → kelvin)
20 °F = 266.483 K
20 degrees Fahrenheit (°F) equals 266.483 kelvins (K). Temperature conversions are affine — the answer follows the standard scale formula, not a single multiplier.
Kelvins = Degrees Fahrenheit × 0.555556How 20 degrees Fahrenheit compares to its arithmetic neighbours, converted to kelvins.
| Relation | degrees Fahrenheit | kelvins |
|---|---|---|
| ÷10 | 2 °F | 256.483 K |
| ÷2 (half) | 10 °F | 260.928 K |
| ×1 (this value) | 20 °F | 266.483 K |
| ×2 (double) | 40 °F | 277.594 K |
| ×5 | 100 °F | 310.928 K |
| ×10 | 200 °F | 366.483 K |
Fahrenheit to Kelvin chains two affine steps: K = (F − 32) × 5/9 + 273.15. A 70 °F room is 294.26 K; a 451 °F book-burning autoignition is 505.93 K. Most physics work skips Fahrenheit entirely and asks Kelvin directly from raw measurements; this conversion is mainly useful when an old US engineering handbook quotes a black-body or radiation temperature in Fahrenheit and you need the SI value for a calculation.
Spacesuit life-support engineering and extreme-climate records both chain Fahrenheit through to Kelvin: human core body temperature at 98.6 °F is 310.15 K, the figure NASA designs cabin thermal control around, and the coldest reliably recorded surface temperature on Earth, −128.6 °F at Vostok Station, is 183.93 K. Because the conversion runs through Celsius internally, always apply the −32 and the ×5/9 before adding 273.15 — reversing the order produces a wrong intermediate value even though the final offset is correct.
Begin with your temperature in degrees Fahrenheit.
K = (°F − 32) × 5/9 + 273.15
The result is the equivalent temperature in kelvins. For example, 100 °F = 310.928 K.
Temperature conversion is affine, not a single multiplication. The exact formula is shown below — it follows directly from the definitions of the degree Fahrenheit and kelvin scales.
K = (°F − 32) × 5/9 + 273.15
Fifty common reference values, hand-picked for skim utility. Use the calculator above for any value not listed.
| Degrees Fahrenheit (°F) | Kelvins (K) |
|---|---|
| -50 °F | 227.59 K |
| -40 °F | 233.15 K |
| -30 °F | 238.71 K |
| -25 °F | 241.48 K |
| -20 °F | 244.26 K |
| -15 °F | 247.04 K |
| -10 °F | 249.82 K |
| -5 °F | 252.59 K |
| -2 °F | 254.26 K |
| -1 °F | 254.82 K |
| 0 °F | 255.37 K |
| 1 °F | 255.93 K |
| 2 °F | 256.48 K |
| 5 °F | 258.15 K |
| 10 °F | 260.93 K |
| 15 °F | 263.71 K |
| 18 °F | 265.37 K |
| 20 °F | 266.48 K |
| 21 °F | 267.04 K |
| 22 °F | 267.59 K |
| 23 °F | 268.15 K |
| 24 °F | 268.71 K |
| 25 °F | 269.26 K |
| 27 °F | 270.37 K |
| 28 °F | 270.93 K |
| 30 °F | 272.04 K |
| 32 °F | 273.15 K |
| 35 °F | 274.82 K |
| 37 °F | 275.93 K |
| 40 °F | 277.59 K |
| 45 °F | 280.37 K |
| 50 °F | 283.15 K |
| 55 °F | 285.93 K |
| 60 °F | 288.71 K |
| 65 °F | 291.48 K |
| 70 °F | 294.26 K |
| 75 °F | 297.04 K |
| 80 °F | 299.82 K |
| 85 °F | 302.59 K |
| 90 °F | 305.37 K |
| 95 °F | 308.15 K |
| 100 °F | 310.93 K |
| 110 °F | 316.48 K |
| 120 °F | 322.04 K |
| 150 °F | 338.71 K |
| 180 °F | 355.37 K |
| 200 °F | 366.48 K |
| 250 °F | 394.26 K |
| 300 °F | 422.04 K |
| 500 °F | 533.15 K |
Water freezes at 32 °F. Room temperature is around 68–72 °F. A hot summer day is around 90 °F. In kelvins, that gives you: 1 °F = 255.928 K, 10 °F = 260.928 K, 100 °F = 310.928 K.
The degree Fahrenheit (°F) is the customary temperature scale in the United States, defined since 1968 such that water freezes at exactly 32 °F and boils at exactly 212 °F at standard pressure — giving 180 Fahrenheit degrees over a range of 100 Celsius degrees. The scale was proposed in 1724 by Daniel Gabriel Fahrenheit, who calibrated zero against a brine ice bath. To convert °F to °C, subtract 32 then multiply by 5/9.
The kelvin (K) is the SI base unit of thermodynamic temperature. Since the 2019 SI redefinition it is defined by fixing the Boltzmann constant to exactly 1.380649 × 10⁻²³ J/K. Zero kelvin is absolute zero, the lowest temperature theoretically possible. The kelvin is preferred in science and engineering because it has a true zero — temperature ratios become physically meaningful, unlike on the Celsius or Fahrenheit scales. Note: by convention there is no degree sign — 300 K, not 300 °K.
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