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Temperature Converter

Convert between Celsius, Fahrenheit, and Kelvin. Online temperature converter with formulas and conversion table.

Sources: NIST -- SI Units of Temperature

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How the Temperature Converter Works

This tool instantly converts values between the three main temperature scales: Celsius (°C), Fahrenheit (°F), and Kelvin (K).

Conversion Formulas

  • °C to °F: multiply by 9/5 and add 32
  • °F to °C: subtract 32 and multiply by 5/9
  • °C to K: add 273.15
  • K to °C: subtract 273.15

Reference Points

EventCelsiusFahrenheitKelvin
Absolute zero-273.15°C-459.67°F0 K
Water freezing0°C32°F273.15 K
Body temperature37°C98.6°F310.15 K
Water boiling100°C212°F373.15 K

When You Need Temperature Conversion

  • Cooking: American recipes use Fahrenheit (350°F = 177°C for an oven)
  • Travel: US weather reports are in Fahrenheit (77°F = 25°C)
  • Science: publications use Kelvin
  • Medicine: fever is measured in different scales depending on the country

Frequently Asked Questions

How do you convert Celsius to Fahrenheit?▼
°F = °C × 9/5 + 32. For example, 20°C = 68°F.
At what temperature do Celsius and Fahrenheit meet?▼
At -40°. Solving the equation gives °C = -40, so -40°C = -40°F. It is the only intersection point.
Why is absolute zero -273.15°C?▼
Absolute zero (0 K) is the point where particles have minimum possible kinetic energy. It is a theoretical limit that cannot be exactly reached.