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Temperature Converter - Online Celsius Fahrenheit Kelvin Tool

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Temperature Converter

Convert between Celsius, Fahrenheit, and Kelvin instantly. Just type a value in any field.

°C
°F
K
Conversion Formulas
  • Celsius to Fahrenheit: °F = (°C × 9/5) + 32
  • Celsius to Kelvin: K = °C + 273.15
  • Fahrenheit to Celsius: °C = (°F − 32) × 5/9
  • Fahrenheit to Kelvin: K = (°F − 32) × 5/9 + 273.15
  • Kelvin to Celsius: °C = K − 273.15
  • Kelvin to Fahrenheit: °F = (K − 273.15) × 9/5 + 32
Common Temperature Points
Description Celsius (°C) Fahrenheit (°F) Kelvin (K)
Absolute Zero -273.15 -459.67 0
Freezing point of water 0 32 273.15
Room temperature (approx.) 20 - 25 68 - 77 293 - 298
Body temperature (average) 37 98.6 310.15
Boiling point of water 100 212 373.15
Frequently Asked Questions

Multiply the Celsius temperature by 9/5, then add 32. For example, 0°C is (0 × 9/5) + 32 = 32°F.

First subtract 32 from the Fahrenheit value, multiply by 5/9, then add 273.15: K = (°F − 32) × 5/9 + 273.15.

Kelvin is an absolute temperature scale. Zero Kelvin (0 K) corresponds to absolute zero, the theoretical lowest possible temperature. Thus negative Kelvin values are not physically meaningful. Our converter prevents negative Kelvin inputs.

They refer to the same scale. "Centigrade" was the original name, but "Celsius" is now the standard term. Both divide the temperature interval between the freezing and boiling points of water into 100 degrees.

It uses precise formulas with up to 15 decimal places and rounds displayed results to 2 decimal places for readability. The underlying calculations maintain high precision.
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