Conversion
Temperature Converter: Celsius, Fahrenheit, and Kelvin
Learn temperature conversion formulas and common reference points for Celsius, Fahrenheit, and Kelvin scales.
Temperature conversion is essential for cooking, science, travel, and understanding weather forecasts from different countries.
The Three Temperature Scales
- Celsius (°C): Water freezes at 0°, boils at 100°. Used worldwide.
- Fahrenheit (°F): Water freezes at 32°, boils at 212°. Used in the US.
- Kelvin (K): Absolute scale starting at absolute zero. Used in science.
Conversion Formulas
Celsius to Fahrenheit: °F = (°C × 9/5) + 32
Fahrenheit to Celsius: °C = (°F - 32) × 5/9
Celsius to Kelvin: K = °C + 273.15
Kelvin to Celsius: °C = K - 273.15
Quick Reference Points
- Water freezes: 0°C = 32°F = 273.15K
- Room temperature: 20-22°C = 68-72°F
- Body temperature: 37°C = 98.6°F
- Water boils: 100°C = 212°F = 373.15K
Frequently Asked Questions
What is the easiest way to convert Celsius to Fahrenheit?
Multiply by 2, add 30 for a rough estimate. For exact: multiply by 1.8 (or 9/5) and add 32.
Why does the US use Fahrenheit?
The US adopted Fahrenheit before Celsius became standard. Converting the entire country would be costly and confusing for daily life.
What is absolute zero?
Absolute zero (0 Kelvin, -273.15°C, -459.67°F) is the lowest possible temperature where molecular motion stops.