Celsius to Fahrenheit Converter
Convert any temperature between Celsius and Fahrenheit instantly with our free online converter. Type in either field and both values update in real time — no Calculate button, no page reload. Use it for cooking, weather, science, travel, or any situation where you need a quick temperature conversion.
How to Convert Celsius to Fahrenheit
The formula to convert Celsius to Fahrenheit is straightforward: multiply the Celsius value by 9/5 (which is 1.8) and then add 32.
Formula: °F = (°C × 9/5) + 32
For example, to convert 25°C to Fahrenheit: 25 × 1.8 = 45, then 45 + 32 = 77°F. So 25°C = 77°F — a warm summer day.
How to Convert Fahrenheit to Celsius
To reverse the conversion — going from Fahrenheit to Celsius — subtract 32 from the Fahrenheit value and then multiply by 5/9.
Formula: °C = (°F − 32) × 5/9
For example, to convert 98.6°F to Celsius: 98.6 − 32 = 66.6, then 66.6 × 5/9 = 37°C. That is normal human body temperature.
Common Celsius to Fahrenheit Conversions
These are the most frequently searched temperature conversions for quick reference:
| Celsius (°C) | Fahrenheit (°F) | Reference |
|---|---|---|
| -40°C | -40°F | Celsius and Fahrenheit are equal |
| -20°C | -4°F | Very cold winter day |
| -10°C | 14°F | Freezing cold |
| 0°C | 32°F | Freezing point of water |
| 10°C | 50°F | Cool autumn day |
| 15°C | 59°F | Mild temperature |
| 20°C | 68°F | Room temperature |
| 25°C | 77°F | Warm summer day |
| 30°C | 86°F | Hot day |
| 37°C | 98.6°F | Normal body temperature |
| 40°C | 104°F | Fever territory |
| 100°C | 212°F | Boiling point of water |
| 180°C | 356°F | Baking temperature (low) |
| 200°C | 392°F | Baking temperature (medium) |
| 220°C | 428°F | Baking temperature (high) |
Celsius vs Fahrenheit — What Is the Difference?
Celsius and Fahrenheit are two temperature scales used around the world. Celsius (°C), also called centigrade, is used by most countries and is the standard scale in science. It sets the freezing point of water at 0° and the boiling point at 100° at standard atmospheric pressure.
Fahrenheit (°F) is primarily used in the United States, its territories, and a few other countries. On the Fahrenheit scale, water freezes at 32° and boils at 212°. The scale was developed by Daniel Gabriel Fahrenheit in 1724.
The key practical difference is in daily weather: a 30°C day in Europe is the same as an 86°F day in the United States — both are a hot summer day. Knowing how to convert between the two is essential for travelers, cooks, scientists, and anyone reading international weather forecasts.
Celsius to Fahrenheit for Cooking
Oven temperatures are one of the most common reasons people need to convert Celsius to Fahrenheit. Most European recipes use Celsius while American recipes use Fahrenheit. Here are the key baking conversions:
- 150°C = 302°F — Low oven, slow cooking
- 180°C = 356°F — Moderate oven, most baking
- 200°C = 392°F — Hot oven, roasting
- 220°C = 428°F — Very hot oven, pizza, bread
- 240°C = 464°F — Maximum oven, searing
Frequently Asked Questions
What is 37 degrees Celsius in Fahrenheit?
37°C equals 98.6°F. This is the average normal human body temperature. A fever is generally considered to begin at 38°C (100.4°F).
What is 100 degrees Fahrenheit in Celsius?
100°F equals approximately 37.78°C. This is just above normal body temperature and is considered a low-grade fever.
Which is colder, 0°C or 0°F?
0°F is colder. It equals −17.78°C, which is well below the freezing point of water. 0°C is the freezing point of water, equivalent to 32°F.
Why does the US use Fahrenheit instead of Celsius?
The United States adopted the Fahrenheit scale before the metric system became internationally standardized. While most countries switched to Celsius as part of metrication during the 20th century, the US retained Fahrenheit for everyday use alongside the imperial measurement system.