Temperature Converter

Temperature conversion is one of the most commonly needed calculations, especially when cooking, traveling, or reading international weather forecasts. Unlike most unit conversions, temperature scales use different zero points and different scales, requiring formulas rather than simple multiplication.

Temperature Scales Explained

Celsius (°C): Used by most of the world. Water freezes at 0°C and boils at 100°C at standard pressure. Fahrenheit (°F): Used primarily in the United States. Water freezes at 32°F and boils at 212°F. Kelvin (K): The SI unit of thermodynamic temperature used in science. Absolute zero (0 K) is the coldest possible temperature, −273.15°C. Rankine (°R): An absolute temperature scale using Fahrenheit-sized degrees, used in some engineering applications in the US.

Conversion Formulas

°F = (°C × 9/5) + 32. °C = (°F − 32) × 5/9. K = °C + 273.15. °C = K − 273.15. °R = (°C + 273.15) × 9/5.

Key Reference Points

Absolute zero: −273.15°C = −459.67°F = 0 K. Water freezes: 0°C = 32°F = 273.15 K. Room temperature: ~20°C = 68°F = 293.15 K. Body temperature: 37°C = 98.6°F = 310.15 K. Water boils: 100°C = 212°F = 373.15 K.