Fahrenheit, Celsius and Kelvin converter
To convert Fahrenheit to Celsius, subtract 32 and multiply by 5/9. To go from Celsius to Fahrenheit, multiply by 9/5 and add 32. For Kelvin, add 273.15 to Celsius. So 68°F is 20°C, 98.6°F is 37°C, and a 350°F oven is about 176.7°C. Type a value in any field to convert.
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Temperature conversion formulas
\[ \begin{gathered} {}^{\circ}\text{C} = \dfrac{({}^{\circ}\text{F} - 32) \times 5}{9} \\ {}^{\circ}\text{F} = \dfrac{{}^{\circ}\text{C} \times 9}{5} + 32 \\ K = {}^{\circ}\text{C} + 273.15 \\ K = \dfrac{({}^{\circ}\text{F} - 32) \times 5}{9} + 273.15 \end{gathered} \]
The two scales meet at −40: −40°C equals −40°F. The Kelvin scale, used in science, starts at absolute zero (\( 0 \, \text{K} = - 273.15 \)°C) and its steps are the same size as Celsius degrees.
Fahrenheit to Celsius chart
| °F | °C | What it means |
|---|---|---|
| 0 | −17.8 | Very cold day |
| 32 | 0 | Water freezes |
| 68 | 20 | Room temperature |
| 98.6 | 37 | Normal body temperature |
| 100.4 | 38 | Fever threshold |
| 212 | 100 | Water boils at sea level |
| 350 | 176.7 | Common baking temperature |
Oven temperatures
US recipes use Fahrenheit: 325°F is 163°C, 350°F is 177°C, 375°F is 191°C, 400°F is 204°C and 425°F is 218°C. Ovens in Europe are set in 5- or 10-degree steps, so round to the nearest 5. A convection (fan) oven usually runs 25°F (about 15°C) cooler.
3 real-life examples
A 350°F oven in Celsius
\( \dfrac{(350 - 32) \times 5}{9} = \) 176.7°C; set a European oven to 175 or 180°C.
A 101.3°F fever in Celsius
\( \dfrac{(101.3 - 32) \times 5}{9} = \) 38.5°C.
A 25°C day in Fahrenheit
\( \dfrac{25 \times 9}{5} + 32 = \) 77°F; in Kelvin, \( 25 + 273.15 = \) 298.15 K.