Fahrenheit to Celsius Calculator
°F
Degrees Celsius:
Kelvin:
Calculation:
Use this calculator to convert degrees Fahrenheit to Celsius. Type the temperature, with decimals or as a negative if needed, and you get the result in °C and in kelvin too.
Below you will find the formula, worked examples, a conversion chart, reference temperatures (freezing, body temperature, boiling) and the most common oven settings.
How to use the Fahrenheit to Celsius calculator?
Step 1: Type the temperature in degrees Fahrenheit in the box. Decimals work with a point or a comma (36.6 or 36,6), and so do negative values such as -5.
Step 2: Press Calculate or the Enter key.
Step 3: The result in degrees Celsius appears on the right. The same temperature in kelvin is shown below it.
Step 4: The Calculation box shows the operations with your number.
If you enter a temperature below absolute zero (-459.67 °F), the calculator warns you, because that temperature does not exist.
Fahrenheit to Celsius formula
To convert degrees Fahrenheit to Celsius, subtract 32 and multiply by 5/9:
| T(°C) = (T(°F) − 32) × 5/9 |
For kelvin, convert to Celsius first and then add 273.15:
| T(K) = T(°C) + 273.15 |
These relationships are exact by definition: 0 °C is 273.15 K and 32 °F, and a 100 °C interval equals a 180 °F interval.
Mental shortcut. Subtract 30 from the degrees Fahrenheit and halve it. It is only approximate: 70 °F gives 20 °C with the shortcut, but the exact value is 21.11 °C. It tells you whether it is warm or cold, but it is not good enough for cooking or science.
Fahrenheit to Celsius examples
Example 1: Convert 98.6 °F to Celsius
We subtract 32 and multiply by 5/9:
T(°C) = (98.6 − 32) × 5/9 = 66.6 × 5/9 = 37 °C
This is the value usually quoted as normal body temperature. In kelvin it is 310.15 K.
Example 2: An oven set to 350 °F
This is a very common oven setting in US recipes:
T(°C) = (350 − 32) × 5/9 = 318 × 5/9 ≈ 176.67 °C
On an oven that uses the Celsius scale you would set it close to 175 °C.
Example 3: A temperature of 0 °F
Zero degrees Fahrenheit is far colder than the freezing point of water. We subtract 32 and multiply by 5/9:
T(°C) = (0 − 32) × 5/9 = -32 × 5/9 ≈ -17.78 °C
0 °F is -17.78 °C.
Example 4: Convert 72 °F to Celsius
A pleasant room temperature. We apply the formula:
T(°C) = (72 − 32) × 5/9 = 40 × 5/9 ≈ 22.22 °C
In kelvin it is 295.37 K.
Fahrenheit to Celsius chart
| Fahrenheit (°F) | Celsius (°C) | Kelvin (K) |
|---|---|---|
| -40 °F | -40 °C | 233.15 K |
| -20 °F | -28.89 °C | 244.26 K |
| 0 °F | -17.78 °C | 255.37 K |
| 10 °F | -12.22 °C | 260.93 K |
| 20 °F | -6.67 °C | 266.48 K |
| 30 °F | -1.11 °C | 272.04 K |
| 32 °F | 0 °C | 273.15 K |
| 40 °F | 4.44 °C | 277.59 K |
| 50 °F | 10 °C | 283.15 K |
| 60 °F | 15.56 °C | 288.71 K |
| 68 °F | 20 °C | 293.15 K |
| 70 °F | 21.11 °C | 294.26 K |
| 75 °F | 23.89 °C | 297.04 K |
| 80 °F | 26.67 °C | 299.82 K |
| 90 °F | 32.22 °C | 305.37 K |
| 98.6 °F | 37 °C | 310.15 K |
| 100 °F | 37.78 °C | 310.93 K |
| 104 °F | 40 °C | 313.15 K |
| 110 °F | 43.33 °C | 316.48 K |
| 212 °F | 100 °C | 373.15 K |
Reference temperatures
These are the points on the scale people look up most. Water freezes and boils at these temperatures at sea level, at normal atmospheric pressure.
| Reference | °F | °C | K |
|---|---|---|---|
| Absolute zero | -459.67 | -273.15 | 0 |
| Water freezes | 32 | 0 | 273.15 |
| Room temperature | 68 | 20 | 293.15 |
| Human body (usual value) | 98.6 | 37 | 310.15 |
| Water boils | 212 | 100 | 373.15 |
| Celsius and Fahrenheit match | -40 | -40 | 233.15 |
Oven temperatures in Fahrenheit and Celsius
US recipes give the oven temperature in Fahrenheit. The chart shows the exact value in Celsius and that value rounded to the nearest multiple of 5, which is the practical setting for an oven that uses Celsius.
| Oven (°F) | Exact Celsius (°C) | Rounded to 5 (°C) |
|---|---|---|
| 250 °F | 121.11 °C | 120 °C |
| 275 °F | 135 °C | 135 °C |
| 300 °F | 148.89 °C | 150 °C |
| 325 °F | 162.78 °C | 165 °C |
| 350 °F | 176.67 °C | 175 °C |
| 375 °F | 190.56 °C | 190 °C |
| 400 °F | 204.44 °C | 205 °C |
| 425 °F | 218.33 °C | 220 °C |
| 450 °F | 232.22 °C | 230 °C |
| 475 °F | 246.11 °C | 245 °C |
| 500 °F | 260 °C | 260 °C |
Frequently asked questions
How do you convert Fahrenheit to Celsius?
Subtract 32 from the degrees Fahrenheit and multiply by 5/9. For example, (77 − 32) × 5/9 = 25 °C.
What is 98.6 °F in Celsius?
98.6 °F is 37 °C, the value usually quoted as normal body temperature. In practice, body temperature varies from person to person and through the day.
How do I convert Fahrenheit to kelvin?
Convert to Celsius first and then add 273.15. For example, 212 °F is 100 °C, which is 373.15 K.
At what temperature are Fahrenheit and Celsius equal?
At -40. It holds that -40 °F is -40 °C, and it is the only temperature where the two scales show the same number.
What is the lowest possible temperature?
Absolute zero: -459.67 °F, which is -273.15 °C or 0 K. Nothing can be cooled below that point, so the calculator rejects lower values and shows a warning.
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