Celsius ↔ Fahrenheit Converter
Kelvin Equivalent
Common Reference Points
| Celsius (°C) | Fahrenheit (°F) | Description |
|---|---|---|
| -273.15 | -459.67 | Absolute Zero |
| -40 | -40 | Equal point (°C = °F) |
| 0 | 32 | Water Freezing Point |
| 20 | 68 | Room Temperature |
| 37 | 98.6 | Human Body Temperature |
| 100 | 212 | Water Boiling Point |
How to Convert Celsius to Fahrenheit
Converting between Celsius and Fahrenheit is one of the most common temperature conversions needed in everyday life, science, cooking, and travel. Our free Celsius to Fahrenheit converter gives you instant results with the full formula displayed so you can learn as you convert.
The Celsius to Fahrenheit Formula
The standard formula to convert degrees Celsius to degrees Fahrenheit is:
°F = (°C × 9/5) + 32
For example, to convert 25°C to Fahrenheit: (25 × 9/5) + 32 = 45 + 32 = 77°F.
To convert in reverse, from Fahrenheit to Celsius, use:
°C = (°F − 32) × 5/9
History of the Two Temperature Scales
The Celsius scale was proposed by Swedish astronomer Anders Celsius in 1742. It defines 0°C as the freezing point of water and 100°C as the boiling point at standard atmospheric pressure, making it intuitive for scientific and everyday use. It is the official scale in most countries and in all scientific contexts worldwide.
The Fahrenheit scale was developed by Polish-German physicist Daniel Gabriel Fahrenheit in 1724. It sets the freezing point of water at 32°F and boiling at 212°F. It remains in common use in the United States for weather forecasts, cooking temperatures, and body temperature readings.
Important Reference Points
- Absolute Zero: −273.15°C = −459.67°F — the coldest theoretically possible temperature.
- Water Freezing: 0°C = 32°F — the foundation of the Celsius scale.
- Normal Body Temperature: 37°C = 98.6°F — the healthy human average.
- Water Boiling: 100°C = 212°F — at sea-level atmospheric pressure.
- Equal Point: −40°C = −40°F — the only temperature where both scales agree.
Practical Uses
Knowing how to convert between Celsius and Fahrenheit is valuable when travelling to the USA, reading international recipes, understanding weather forecasts, and studying physics or chemistry. Our converter also displays the equivalent Kelvin value, giving you all three major temperature scales at once.