Convert temperatures both ways without the guesswork. Type a number, pick the direction, and see the answer with the formula used – handy for ovens, weather forecasts and science homework.
Celsius ⇄ Fahrenheit Converter
Read the full method in our guide: How to Convert Celsius to Fahrenheit (and Back)
How to use the Celsius to Fahrenheit Converter
- Type the temperature in degrees Celsius into the box.
- The answer in degrees Fahrenheit appears straight away — there is nothing to press.
- A short line under the result shows the working, so you can check the maths yourself.
- To go the other way, the tool also converts Fahrenheit back to Celsius.
The formula
To turn Celsius into Fahrenheit, multiply by 9/5 and then add 32. In symbols: °F = °C × 9/5 + 32. Multiplying by 1.8 instead of 9/5 gives exactly the same answer and is easier on a phone calculator.
The 32 is there because the two scales do not start at the same point. Water freezes at 0 °C but at 32 °F, and boils at 100 °C but at 212 °F. The Celsius figure you type is the input; the Fahrenheit figure is the result. To convert back, take 32 off first, then multiply by 5/9.
Quick conversion table
| Celsius (°C) | Fahrenheit (°F) |
|---|---|
| −10 °C | 14 °F |
| 0 °C | 32 °F |
| 10 °C | 50 °F |
| 20 °C | 68 °F |
| 25 °C | 77 °F |
| 30 °C | 86 °F |
| 37 °C | 98.6 °F |
| 100 °C | 212 °F |
Worked example
A weather app says tomorrow will reach 32 °C, and you want to know what that feels like in Fahrenheit before a trip. Multiply 32 by 9/5: 32 × 1.8 = 57.6. Then add 32: 57.6 + 32 = 89.6. So 32 °C = 89.6 °F — a hot day by anyone’s measure, well past t-shirt weather and into find-some-shade territory. That is also why a forecast of “the high eighties” in the US means summer heat, not a chilly evening.
Common mistakes
- Forgetting to add 32. Multiplying 20 °C by 1.8 gives 36, which looks like a cold day. The real answer is 68 °F.
- Adding 32 first when converting back. Going from Fahrenheit to Celsius, subtract the 32 before you multiply, never after.
- Using the rough “double it and add 30” shortcut for cooking. It is fine for deciding on a jacket, but two or three degrees matter in an oven or for a fever.
- Mixing up a body temperature. 98.6 °F is a normal 37 °C. Read as Celsius it would look alarming, so check the letter on the thermometer display.
Frequently asked questions
Q: What is 180 °C in Fahrenheit for baking?
180 × 9/5 + 32 = 356 °F. Most American recipes round this to 350 °F, and that small difference rarely matters for home baking.
Q: Is there a temperature where Celsius and Fahrenheit are the same?
Yes: −40. −40 °C and −40 °F are exactly equal, which makes a handy check — put −40 into the formula either way and you get −40 back.
Q: How do I convert Fahrenheit to Celsius quickly?
Take 32 off the Fahrenheit figure, multiply by 5, then divide by 9. For example, 68 °F: 68 − 32 = 36, 36 × 5 = 180, 180 ÷ 9 = 20 °C.