celsius to fahrenheit converter
celsius to fahrenheit converter. Convert celsius to fahrenheit with the exact factor, a 20-row table, and the pitfalls that change the result. °F = °C × 9/5 + 32.
1 °C = 33.8 °F. Full precision: 50 °F. Swap to fahrenheit to celsius
How to convert celsius to fahrenheit
Fahrenheit equals Celsius times 9/5, plus 32. The 32 is an offset, not a factor. Water freezes at 0 °C and 32 °F, and boils at 100 °C and 212 °F. A change of one degree Celsius is a change of 1.8 degrees Fahrenheit, and you do not add 32 to a change. Minus 40 is the same number on both scales, which is a useful check: if the converter does not send −40 °C to −40 °F, it is broken.
Weather, cooking, and thermostats. 180 °C for baking is 356 °F. Body temperature of 37 °C is 98.6 °F. A room at 20 °C is 68 °F. Those three are the values people argue about when a phone and an oven disagree, and they disagree because one of them dropped the 32 or used 2 instead of 9/5.
Exact formula
Formula°F = °C × 9/5 + 32°F = °C × 9/5 + 32 One °C is 33.8 °F. Ten °C is 50 °F. The worked example below uses that same conversion.
Conversion table
The celsius column runs from -40 °C (-40 °F) through 200 °C (392 °F).
| Celsius | Fahrenheit |
|---|---|
| -40 | -40 |
| -17.78 | -0.004 |
| 0 | 32 |
| 10 | 50 |
| 15 | 59 |
| 20 | 68 |
| 21 | 69.8 |
| 25 | 77 |
| 30 | 86 |
| 32 | 89.6 |
| 37 | 98.6 |
| 40 | 104 |
| 50 | 122 |
| 60 | 140 |
| 80 | 176 |
| 90 | 194 |
| 100 | 212 |
| 150 | 302 |
| 180 | 356 |
| 200 | 392 |
Worked example: Celsius to Fahrenheit
An oven at 180 °C is 356 °F. Multiply by 9/5 before you add 32. Adding 32 first is how a baking temperature turns into nonsense. Body temperature of 37 °C is 98.6 °F, the textbook 98.6 °F. The scales cross at -40, so -40 °C is -40 °F. That single check proves both the 1.8 factor and the offset. A rise of 5 °C is not a reading: skip the 32 and the interval is 9 °F. Kelvin has to become Celsius before this formula applies.
Pitfalls for celsius to fahrenheit
- Do not add 32 and then multiply. The order is multiply by 9/5 first, then add 32.
- A temperature difference skips the 32. Five degrees warmer in Celsius is nine degrees warmer in Fahrenheit.
- Kelvin is not Fahrenheit. Subtract 273.15 to reach Celsius before you use this formula, or open the kelvin page.
- Oven dials and gas marks are not Fahrenheit. A gas mark is a separate scale.
Frequently asked questions
What is the formula from Celsius to Fahrenheit?
Multiply by 9/5 (or 1.8) and add 32. 10 °C is 50 °F. 0 °C is 32 °F.
Why is −40 special?
The lines cross there. −40 °C is −40 °F, so it checks both the factor and the offset at once.
Is a degree Celsius bigger than a degree Fahrenheit?
Yes. One Celsius degree is 1.8 Fahrenheit degrees. The zero points also differ, which is why you add 32 for a reading.
How do I convert a rise of 5 °C?
Multiply the 5 by 9/5. The rise is 9 °F. Do not add 32 to a difference.