Power Calculators

🌡️ Temperature Converter

Convert temperature between Celsius, Fahrenheit, Kelvin, Rankine and other common temperature scales.

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Enter details

Enter the temperature you want to convert.

Fill in the details and click Calculate to see your results.


Also available in our Android app, with charts and full breakdown tables.

📘 About the Temperature Converter

Temperature is a measure related to the thermal state of a system.

Celsius and Fahrenheit are common everyday temperature scales.

Kelvin is the SI base unit for thermodynamic temperature.

Rankine is an absolute temperature scale using Fahrenheit-sized degrees.

Réaumur is a historical temperature scale that is still encountered in some technical and historical references.

✏️ Worked examples

Example 1 - 25°C

You enter
Temperature25
Input UnitCelsius (°C)
You get
Celsius (°C)25
Fahrenheit (°F)77
Kelvin (K)298.15
Rankine (°R)536.67
Réaumur (°Ré)20

25°C equals 77°F, 298.15 K and 536.67°R.

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Example 2 - 100°F

You enter
Temperature100
Input UnitFahrenheit (°F)
You get
Celsius (°C)37.7778
Fahrenheit (°F)100
Kelvin (K)310.928
Rankine (°R)559.67
Réaumur (°Ré)30.2222

100°F equals approximately 37.78°C and 310.93 K.

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Example 3 - 300 K

You enter
Temperature300
Input UnitKelvin (K)
You get
Celsius (°C)26.85
Fahrenheit (°F)80.33
Kelvin (K)300
Rankine (°R)540
Réaumur (°Ré)21.48

300 K equals approximately 26.85°C and 80.33°F.

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Example 4 - Freezing point

You enter
Temperature0
Input UnitCelsius (°C)
You get
Celsius (°C)0
Fahrenheit (°F)32
Kelvin (K)273.15
Rankine (°R)491.67
Réaumur (°Ré)0

0°C equals 32°F and 273.15 K.

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🧭 How to use this calculator

What you enter

  • TemperatureEnter the temperature you want to convert.
  • Input Unit

What you get

  • Celsius (°C)
  • Fahrenheit (°F)
  • Kelvin (K)
  • Rankine (°R)
  • Réaumur (°Ré)

💡 Celsius

  • The Celsius scale defines 0°C as the freezing point of water at standard atmospheric pressure.
  • The boiling point of water is approximately 100°C at standard atmospheric pressure.

💡 Fahrenheit

  • The Fahrenheit scale is widely used in the United States.
  • Water freezes at 32°F and boils at 212°F at standard atmospheric pressure.

💡 Kelvin

  • Kelvin is the SI base unit for thermodynamic temperature.
  • 0 K represents absolute zero.
  • A temperature difference of one kelvin has the same magnitude as one degree Celsius.

💡 Rankine

  • Rankine is an absolute temperature scale based on Fahrenheit-sized degrees.
  • Absolute zero is 0°R.

❓ Frequently asked questions

How do I convert Celsius to Fahrenheit?

Multiply Celsius by 9/5 and add 32.

How do I convert Fahrenheit to Celsius?

Subtract 32 from Fahrenheit and multiply by 5/9.

How do I convert Celsius to Kelvin?

Add 273.15 to the Celsius temperature.

What is absolute zero?

Absolute zero is 0 K, equivalent to -273.15°C or -459.67°F.

What is the difference between Kelvin and Celsius?

Kelvin and Celsius have equal-sized degrees, but their zero points differ by 273.15 degrees.

What is Rankine?

Rankine is an absolute temperature scale using Fahrenheit-sized degrees.