Temperature Converter - Celsius, Fahrenheit, Kelvin

  • Celsius (°C)
  • Fahrenheit (°F)
  • Kelvin (K)
  • Fahrenheit (°F)
  • Celsius (°C)
  • Kelvin (K)
Results
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Convert temperature between Celsius, Fahrenheit, and Kelvin in a single step. Our Temperature Converter handles everyday weather conversions (°C to °F), scientific and lab work (Kelvin), cooking temperatures, and anything in between.

The tool uses the exact international definitions: °F = °C × 9/5 + 32, and K = °C + 273.15. Conversion is instant and live — type a value and the result updates as you type, including negative temperatures for freezer and winter conditions.

Common reference points: water freezes at 0°C / 32°F / 273.15 K and boils at 100°C / 212°F / 373.15 K. Body temperature is about 37°C / 98.6°F. Keep these anchors in mind to sanity-check any conversion.

Công thức
°F = °C × 9/5 + 32 | K = °C + 273.15 | °C = (°F − 32) × 5/9

Câu hỏi thường gặp

How do you convert Celsius to Fahrenheit?
Multiply the Celsius value by 9/5 and add 32. For example, 20°C × 1.8 + 32 = 68°F. To convert back, subtract 32 first, then divide by 1.8.
Why is -40 the same in Celsius and Fahrenheit?
-40 is the unique point where the two scales intersect: -40 × 9/5 + 32 = -40. This makes -40°C exactly equal to -40°F.
What is absolute zero in each unit?
Absolute zero is -273.15°C, which equals -459.67°F and 0 K. It is the lowest physically possible temperature, where molecular motion stops.
Does Kelvin use the degree symbol?
No. Kelvin is an absolute temperature scale and its values are written simply as "K" — for example 300 K, not 300°K. The size of one Kelvin equals one degree Celsius.

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