Celsius to Fahrenheit Calculator
°C
Degrees Fahrenheit:
Kelvin:
Calculation:
Use this calculator to convert degrees Celsius to Fahrenheit. Type the temperature, with decimals or as a negative if needed, and you get the result in °F 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 Celsius to Fahrenheit calculator?
Step 1: Type the temperature in degrees Celsius 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 Fahrenheit 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 (-273.15 °C), the calculator warns you, because that temperature does not exist.
Celsius to Fahrenheit formula
To convert degrees Celsius to Fahrenheit, multiply by 9/5 (that is, by 1.8) and add 32:
| T(°F) = T(°C) × 9/5 + 32 |
For kelvin, just add 273.15 to the degrees Celsius:
| 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. Double the degrees Celsius and add 30. It is only approximate: 20 °C gives 70 °F with the shortcut, but the exact value is 68 °F. It tells you whether it is warm or cold, but it is not good enough for cooking or science.
Celsius to Fahrenheit examples
Example 1: Convert 25 °C to Fahrenheit
We multiply by 9/5 and add 32:
T(°F) = 25 × 9/5 + 32 = 45 + 32 = 77 °F
A 25 °C afternoon is 77 °F.
Example 2: How many degrees Fahrenheit is 37 °C?
We use the same formula:
T(°F) = 37 × 9/5 + 32 = 66.6 + 32 = 98.6 °F
This is the value usually quoted as normal body temperature. In kelvin it is 310.15 K, because 37 + 273.15 = 310.15.
Example 3: A negative temperature, -10 °C
The formula works the same way with negative values. We multiply first and then add 32:
T(°F) = -10 × 9/5 + 32 = -18 + 32 = 14 °F
-10 °C is 14 °F. That is still below the freezing point of water (32 °F).
Example 4: An oven set to 180 °C
A very common oven setting in recipes:
T(°F) = 180 × 9/5 + 32 = 324 + 32 = 356 °F
In recipes written in Fahrenheit this setting is usually rounded to 350 °F.
Celsius to Fahrenheit chart
| Celsius (°C) | Fahrenheit (°F) | Kelvin (K) |
|---|---|---|
| -40 °C | -40 °F | 233.15 K |
| -30 °C | -22 °F | 243.15 K |
| -20 °C | -4 °F | 253.15 K |
| -10 °C | 14 °F | 263.15 K |
| 0 °C | 32 °F | 273.15 K |
| 5 °C | 41 °F | 278.15 K |
| 10 °C | 50 °F | 283.15 K |
| 15 °C | 59 °F | 288.15 K |
| 20 °C | 68 °F | 293.15 K |
| 25 °C | 77 °F | 298.15 K |
| 30 °C | 86 °F | 303.15 K |
| 35 °C | 95 °F | 308.15 K |
| 37 °C | 98.6 °F | 310.15 K |
| 40 °C | 104 °F | 313.15 K |
| 50 °C | 122 °F | 323.15 K |
| 60 °C | 140 °F | 333.15 K |
| 70 °C | 158 °F | 343.15 K |
| 80 °C | 176 °F | 353.15 K |
| 90 °C | 194 °F | 363.15 K |
| 100 °C | 212 °F | 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 | °C | °F | K |
|---|---|---|---|
| Absolute zero | -273.15 | -459.67 | 0 |
| Water freezes | 0 | 32 | 273.15 |
| Room temperature | 20 | 68 | 293.15 |
| Human body (usual value) | 37 | 98.6 | 310.15 |
| Water boils | 100 | 212 | 373.15 |
| Celsius and Fahrenheit match | -40 | -40 | 233.15 |
Oven temperatures in Celsius and Fahrenheit
Ovens and recipes use round settings. This chart converts the most common Celsius oven settings to Fahrenheit.
| Oven (°C) | Fahrenheit (°F) |
|---|---|
| 120 °C | 248 °F |
| 130 °C | 266 °F |
| 140 °C | 284 °F |
| 150 °C | 302 °F |
| 160 °C | 320 °F |
| 170 °C | 338 °F |
| 180 °C | 356 °F |
| 190 °C | 374 °F |
| 200 °C | 392 °F |
| 210 °C | 410 °F |
| 220 °C | 428 °F |
| 230 °C | 446 °F |
| 240 °C | 464 °F |
| 250 °C | 482 °F |
Frequently asked questions
How do you convert Celsius to Fahrenheit?
Multiply the degrees Celsius by 9/5 (1.8) and add 32. For example, 25 °C × 1.8 + 32 = 77 °F.
What is 37 °C in Fahrenheit?
37 °C is 98.6 °F, 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 Celsius to kelvin?
Add 273.15. So 0 °C is 273.15 K and 100 °C is 373.15 K. The kelvin does not take a degree symbol: write 300 K, not 300 °K.
At what temperature are Celsius and Fahrenheit equal?
At -40. It holds that -40 °C is -40 °F, and it is the only temperature where the two scales show the same number.
What is the lowest possible temperature?
Absolute zero: 0 K, which is -273.15 °C or -459.67 °F. Nothing can be cooled below that point, so the calculator rejects lower values and shows a warning.
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