Temperature Converter

Convert between Celsius, Fahrenheit, and Kelvin instantly

212.0 °F

How Temperature Conversion Works

Different temperature scales measure the same thermal energy using different starting points and intervals. Celsius sets 0 at water freezing and 100 at boiling. Fahrenheit sets 32 at freezing and 212 at boiling. Kelvin starts at absolute zero, the coldest possible temperature.

To convert between scales, you adjust for both the offset and the scale factor. This converter handles all three scales instantly — just enter a value and pick your target scale.

Key Temperature Conversion Formulas

  • Celsius to Fahrenheit: (C x 9/5) + 32 = F. Example: 25C = 77F.
  • Fahrenheit to Celsius: (F - 32) x 5/9 = C. Example: 77F = 25C.
  • Celsius to Kelvin: C + 273.15 = K. Example: 25C = 298.15K.
  • Kelvin to Celsius: K - 273.15 = C. Example: 300K = 26.85C.

When to Use Each Scale

Celsius is used worldwide for weather, cooking, and everyday measurements. Fahrenheit is the standard for weather and cooking in the United States. Kelvin is used in scientific and engineering contexts where absolute temperature matters, such as gas laws, thermodynamics, and physics calculations.

Frequently Asked Questions

What is the difference between Celsius and Fahrenheit?
Celsius and Fahrenheit use different zero points and interval sizes. Water freezes at 0C (32F) and boils at 100C (212F). This means a 1 degree change in Celsius equals a 1.8 degree change in Fahrenheit.
Why does Kelvin exist if we already have Celsius?
Kelvin is an absolute temperature scale where 0K (-273.15C) is absolute zero — the point where all molecular motion stops. This makes Kelvin essential for scientific formulas like the ideal gas law (PV = nRT) because it avoids negative temperatures.
What is room temperature in each scale?
Typical room temperature is about 20-22C, 68-72F, or 293-295K. These values are commonly used as reference points for scientific experiments and HVAC settings.

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