Convert Celsius to Fahrenheit
25 °C = 77 °F
°F = °C × 9/5 + 32A Celsius to Fahrenheit and Fahrenheit to Celsius converter in one: type a temperature in either box and it converts both ways instantly. Formula: °F = °C × 9/5 + 32.
How to convert Celsius to Fahrenheit
To convert degrees Celsius to degrees Fahrenheit, multiply the Celsius temperature by 9/5 (or 1.8), then add 32.
°F = °C × 9/5 + 32
Example: convert 25 °C to °F
- 25 × 9/5 = 45
- 45 + 32 = 77
- 25 °C = 77 °F
Celsius to Fahrenheit conversion chart
| Degrees Celsius (°C) | Degrees Fahrenheit (°F) |
|---|---|
| -40 °C | -40 °F |
| -20 °C | -4 °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 |
| 40 °C | 104 °F |
| 50 °C | 122 °F |
| 100 °C | 212 °F |
| 150 °C | 302 °F |
| 180 °C | 356 °F |
| 200 °C | 392 °F |
How to convert Fahrenheit to Celsius
To convert degrees Fahrenheit to degrees Celsius, subtract 32 from the Fahrenheit temperature, then multiply by 5/9 (or divide by 1.8).
°C = (°F − 32) × 5/9
Example: convert 98.6 °F to °C
- (98.6 − 32) = 66.6
- 66.6 × 5/9 = 37
- 98.6 °F = 37 °C
Quick mental trick: double it and add 30
For a fast estimate in your head, double the Celsius number and add 30. 20 °C → 40 + 30 = 70 °F (the exact answer is 68 °F). The trick is close for everyday weather and drifts further off at very hot or very cold temperatures, so use the converter above when it matters — for cooking, medicine or science.
Common temperatures in Celsius and Fahrenheit
| What | °C | °F |
|---|---|---|
| Water freezes | 0 °C | 32 °F |
| Home freezer | -18 °C | -0.4 °F |
| Fridge | 4 °C | 39.2 °F |
| Cool day | 10 °C | 50 °F |
| Room temperature | 21 °C | 69.8 °F |
| Warm summer day | 30 °C | 86 °F |
| Normal body temperature | 37 °C | 98.6 °F |
| Fever | 38.5 °C | 101.3 °F |
| Hot bath | 40 °C | 104 °F |
| Cooked chicken (safe inside) | 74 °C | 165.2 °F |
| Water boils (sea level) | 100 °C | 212 °F |
| Moderate oven | 180 °C | 356 °F |
| Hot oven | 220 °C | 428 °F |
Celsius to Fahrenheit chart (−40 °C to 100 °C)
Popular Celsius to Fahrenheit conversions
Celsius vs. Fahrenheit
Celsius (°C) is used for weather, cooking and medicine in almost every country. It puts the freezing point of water at 0 °C and the boiling point at 100 °C, so one Celsius degree is 1/100 of that gap.
Fahrenheit (°F) is the everyday scale in the United States and a few other places. Water freezes at 32 °F and boils at 212 °F — a gap of 180 degrees. That is why one Celsius degree equals 1.8 Fahrenheit degrees, and why the formula multiplies by 9/5 (= 1.8) and shifts by 32.
Scientists usually work in Kelvin, which starts at absolute zero (−273.15 °C) and uses the same degree size as Celsius.
Frequently asked questions
What is the formula for Celsius to Fahrenheit?
°F = °C × 9/5 + 32. Multiply the Celsius temperature by 1.8 and add 32.
What is 37 °C in Fahrenheit?
37 °C is 98.6 °F — the classic value for normal human body temperature.
What is 180 °C in Fahrenheit for the oven?
180 °C is 356 °F. Most recipes round it to 350 °F (gas mark 4).
Is 30 °C hot?
30 °C is 86 °F — a hot summer day for most people.
What is 0 °C in Fahrenheit?
0 °C is 32 °F, the freezing point of water.
How do you convert Celsius to Fahrenheit?
To convert degrees Celsius to degrees Fahrenheit, multiply the Celsius temperature by 9/5 (or 1.8), then add 32. The formula is °F = °C × 9/5 + 32.
How many degrees Fahrenheit are in one Celsius?
1 °C = 33.8 °F.
How do I convert degrees Fahrenheit back to degrees Celsius?
Use the reverse formula: °C = (°F − 32) × 5/9. For example 1 °F = -17.2222 °C.
At what temperature are Celsius and Fahrenheit equal?
−40 °C is exactly −40 °F. It is the only temperature where both scales show the same number.
Is this converter free and accurate?
Yes. It is free, uses exact internationally defined conversion factors, and runs in your browser — nothing you type is sent anywhere.