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.
Celsius (°C)
37.7778
Fahrenheit (°F)
100
Kelvin (K)
310.928
Rankine (°R)
559.67
Réaumur (°Ré)
30.2222

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Réaumur is a historical temperature scale that is still encountered in some technical and historical references.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