How to Convert Celsius to Fahrenheit (Formula & Calculator)
Need to convert Celsius (°C) to Fahrenheit (°F)? You're in the right place. Use our instant calculator below, or scroll down to learn the simple formula and mental math tricks.
The Conversion Formula
The formula to convert Celsius to Fahrenheit is simple:
In plain English: Multiply the Celsius temperature by 1.8, then add 32.
Example Calculation
Let's convert 20°C to Fahrenheit:
- Multiply 20 by 1.8: 20 × 1.8 = 36
- Add 32: 36 + 32 = 68
- Result: 20°C = 68°F
Quick Mental Math Trick 🧠
Don't have a calculator? Use this rough estimate method:
(Example: 20°C × 2 = 40, + 30 = 70°F)
Note: This gives an approximate result (70°F vs actual 68°F), but it's close enough for weather!
Common Temperature Conversions
| Celsius (°C) | Fahrenheit (°F) | Description |
|---|---|---|
| -40°C | -40°F | Extremely Cold |
| 0°C | 32°F | Freezing Point of Water |
| 10°C | 50°F | Cool Day |
| 20°C | 68°F | Room Temperature |
| 30°C | 86°F | Hot Day |
| 37°C | 98.6°F | Body Temperature |
| 100°C | 212°F | Boiling Point of Water |
Why are there two scales?
The Celsius scale (part of the Metric system) is used by almost every country in the world. It's based on water: 0° is freezing and 100° is boiling.
The Fahrenheit scale (part of the Imperial system) is primarily used in the United States, Bahamas, Cayman Islands, Liberia, Palau, the Federated States of Micronesia, and the Marshall Islands. It was created by Daniel Gabriel Fahrenheit in 1724.
Need more precision?
For scientific calculations or when you need more than 2 decimal places, check out our full Temperature Converter tool which supports Kelvin and Rankine as well.