Temperature Converter

Convert Celsius, Fahrenheit, and Kelvin

Temperature conversion is one of the most common calculations people need to perform. Most of the world uses Celsius, while the United States still reports everyday temperatures in Fahrenheit. Scientists use Kelvin, the absolute scale starting at -273.15 °C. This tool lets you convert between all three instantly.

Conversion Formulas

• Celsius → Fahrenheit: °F = (°C × 9/5) + 32
• Fahrenheit → Celsius: °C = (°F − 32) × 5/9
• Celsius → Kelvin: K = °C + 273.15
• Kelvin → Celsius: °C = K − 273.15

Useful Reference Points

• Water freezes at 0 °C / 32 °F / 273.15 K
• Water boils (at sea level) at 100 °C / 212 °F / 373.15 K
• Comfortable room temperature: around 21 °C / 70 °F
• Body temperature: 37 °C / 98.6 °F
• A hot oven: 200 °C / 392 °F

Celsius, Fahrenheit, and Kelvin Explained

Celsius (also called centigrade) defines 0° at the freezing point of water and 100° at its boiling point at standard atmospheric pressure. It's the default scale almost everywhere outside the United States.

Fahrenheit, proposed by Daniel Gabriel Fahrenheit in 1724, places water's freezing point at 32° and boiling at 212°. The scale's finer gradation (180 degrees between freezing and boiling vs. Celsius's 100) is a common argument in its favor.

Kelvin starts at absolute zero — the theoretical point at which particles have minimum thermal motion. It's the SI base unit for temperature and is used throughout science.