Temperature Converter

Convert temperatures between Celsius, Fahrenheit and Kelvin with this free online converter. Enter a temperature, choose your units, and calculate the equivalent value.

Enter temperature Negative Celsius and Fahrenheit values are allowed, but temperatures below absolute zero are not.

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How to Use the Temperature Converter

Enter the temperature you want to convert.
Select the original unit: Celsius, Fahrenheit or Kelvin.
Select the destination unit.
Click Convert Temperature to see the result.
Click Reset to clear the form and result.

Temperature Conversion Formulas

Fahrenheit = (Celsius × 9 ÷ 5) + 32

Celsius = (Fahrenheit − 32) × 5 ÷ 9

Kelvin = Celsius + 273.15

Celsius = Kelvin − 273.15

Kelvin = (Fahrenheit − 32) × 5 ÷ 9 + 273.15

The converter converts the input to Celsius internally before calculating the destination temperature. This approach supports conversions between all three units.

Common Temperature Conversions

0°C = 32°F = 273.15 K
10°C = 50°F = 283.15 K
20°C = 68°F = 293.15 K
25°C = 77°F = 298.15 K
30°C = 86°F = 303.15 K
37°C = 98.6°F = 310.15 K
100°C = 212°F = 373.15 K

Understanding Celsius, Fahrenheit and Kelvin

Celsius (°C)

Celsius is widely used for everyday temperatures around the world. Under standard atmospheric pressure, water freezes at 0°C and boils at approximately 100°C.

Fahrenheit (°F)

Fahrenheit is commonly used for everyday weather and temperature measurements in the United States. Under standard atmospheric pressure, water freezes at 32°F and boils at approximately 212°F.

Kelvin (K)

Kelvin is the SI base unit for thermodynamic temperature and is widely used in science and engineering. The Kelvin scale begins at absolute zero, equivalent to −273.15°C or −459.67°F. Kelvin values are written without a degree symbol.

Frequently Asked Questions

What is 0°C in Fahrenheit?

Zero degrees Celsius equals 32°F.

What is 100°C in Fahrenheit?

100°C equals 212°F.

What is typical room temperature?

A typical indoor room temperature is often around 20°C to 25°C (68°F to 77°F), although comfortable conditions vary.

Can Celsius be converted to Kelvin?

Yes. Add 273.15 to a Celsius temperature to get the equivalent value in Kelvin.

Can temperatures below zero be converted?

Negative Celsius and Fahrenheit values can be converted as long as the temperature is not below absolute zero. Kelvin values cannot be negative in this converter.

Is this Temperature Converter free?

Yes. You can use this converter for free in your browser without installing software.