What Is the Difference Between Temperature Units?
Celsius, Fahrenheit and Kelvin represent three different temperature scales, each with its own area of use. This tool instantly converts any entered value to all three units.
Fahrenheit (°F) is the standard temperature scale across the United States, with water freezing at 32°F and boiling at 212°F. Celsius (°C) sets water freezing at 0°C and boiling at 100°C. Kelvin (K) is the thermodynamic SI base unit where absolute zero is 0 K (−459.67°F).
Conversion formulas: °F = (°C × 9/5) + 32; °C = (°F − 32) × 5/9; K = °C + 273.15. This calculator handles bi-directional conversions instantly.
Quick mental formula: To convert °F to °C approximately, subtract 30 and divide by 2 (e.g. 70°F − 30 = 40 / 2 = 20°C). Normal human body temperature is 98.6°F (37°C / 310 K).