Celsius to Fahrenheit Converter
Convert temperature from Celsius (°C) to Fahrenheit (°F) instantly. Perfect for weather, cooking, science, and international temperature conversions.
Quick Reference - Common Temperatures
Celsius to Fahrenheit Formula
Step-by-Step Example
To convert 20°C to Fahrenheit:
- Multiply the Celsius temperature by 9/5: 20 × 9/5 = 36
- Add 32 to the result: 36 + 32 = 68
- Result: 20°C = 68°F
Celsius to Fahrenheit Conversion Table
| Celsius (°C) | Fahrenheit (°F) | Description |
|---|---|---|
| -40°C | -40°F | Extremely cold (same value) |
| -18°C | 0°F | Very cold winter day |
| 0°C | 32°F | Freezing point of water |
| 10°C | 50°F | Cool day |
| 20°C | 68°F | Room temperature |
| 25°C | 77°F | Comfortable warm day |
| 30°C | 86°F | Hot day |
| 37°C | 98.6°F | Normal body temperature |
| 38°C | 100.4°F | Fever temperature |
| 100°C | 212°F | Boiling point of water |
About Celsius and Fahrenheit
Celsius Scale
The Celsius scale (formerly called centigrade) was created by Swedish astronomer Anders Celsius in 1742. It's used by most countries worldwide and is the standard in scientific contexts. Water freezes at 0°C and boils at 100°C at sea level, making it intuitive and easy to remember.
Fahrenheit Scale
The Fahrenheit scale was created by German physicist Daniel Gabriel Fahrenheit in 1724. It's primarily used in the United States. On this scale, water freezes at 32°F and boils at 212°F at sea level. The scale offers more granularity in everyday temperature ranges.
Global Usage
Celsius is the international standard used by most countries, all scientific work, and weather forecasting worldwide. The United States, Bahamas, Belize, and a few other territories primarily use Fahrenheit for everyday temperature measurements.
Common Uses for Temperature Conversion
🌡️ Weather & Travel
Convert weather forecasts when traveling to or communicating with people in the United States. Most weather apps allow switching between units, but conversion helps with understanding.
👨🍳 Cooking & Recipes
American recipes use Fahrenheit for oven temperatures. If you're using a recipe from the US, you'll need to convert 350°F to approximately 175°C, for example.
🏥 Health & Medical
Some thermometers display in Fahrenheit. Normal body temperature is 37°C (98.6°F), and fever is typically above 38°C (100.4°F).
🔬 Science & Education
Converting between scales is common in science education and when reading scientific papers from different countries.
Frequently Asked Questions
What is the formula to convert Celsius to Fahrenheit?
The formula is: °F = (°C × 9/5) + 32. Multiply the Celsius temperature by 9/5 (or 1.8), then add 32.
What temperature is the same in Celsius and Fahrenheit?
-40° is the same in both scales. -40°C = -40°F. This is the only point where the two temperature scales intersect.
How do you convert Celsius to Fahrenheit mentally?
A quick approximation: double the Celsius temperature and add 30. For example, 20°C × 2 = 40, + 30 = 70°F (actual: 68°F). This gets you close enough for everyday use.
What is 0°C in Fahrenheit?
0°C equals 32°F. This is the freezing point of water at sea level.
Is 30°C hot or cold?
30°C (86°F) is hot. It's a warm summer day temperature. Comfortable room temperature is around 20-22°C (68-72°F).
Why doesn't the US use Celsius?
The US adopted Fahrenheit before Celsius became the international standard. While there have been attempts to switch to metric (including Celsius), the change hasn't been fully implemented due to cost and cultural factors.