Temperature Converter
Convert between Celsius, Fahrenheit, and Kelvin using exact formulas.
The Temperature Converter converts between the three major temperature scales: Celsius, Fahrenheit, and Kelvin. Unlike other unit conversions, temperature uses non-linear formulas rather than simple multiplication factors.
Conversion Formulas
- Celsius to Fahrenheit: °F = °C × 9/5 + 32
- Celsius to Kelvin: K = °C + 273.15
- Fahrenheit to Celsius: °C = (°F − 32) × 5/9
Key Reference Points
Water freezes at 0°C = 32°F = 273.15K. Water boils at 100°C = 212°F = 373.15K. Absolute zero is -273.15°C = -459.67°F = 0K. Normal body temperature is approximately 37°C = 98.6°F.
Temperature conversion is needed in cooking, weather, science, and engineering. Celsius is used worldwide, Fahrenheit is common in the US, and Kelvin is the SI standard used in science.
Frequently Asked Questions
Why is temperature conversion not a simple multiplication?
Because the scales have different zero points. Celsius and Fahrenheit are offset (water freezes at 0°C but 32°F), so conversion requires both multiplication and addition.
What is absolute zero?
Absolute zero (0 Kelvin = -273.15°C = -459.67°F) is the theoretical lowest possible temperature, where molecular motion ceases.
At what temperature are Celsius and Fahrenheit equal?
Celsius and Fahrenheit intersect at -40 degrees. That is, -40°C = -40°F exactly.