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Temperature Converter

Convert between Celsius, Fahrenheit, Kelvin and Rankine instantly.

Enter temperature

Common temperatures

What is this tool?

A temperature converter is a free online tool that converts temperatures between Celsius (°C), Fahrenheit (°F) and Kelvin (K) instantly. Simply enter a temperature in any scale and the other two values update automatically — no formulas to remember.

How to Use

Enter a temperature valueType the temperature number you know into the input field.

Select your input scaleChoose whether your temperature is in Celsius, Fahrenheit or Kelvin.

Read the converted valuesThe equivalent temperatures in all other scales are shown immediately below.

Common Uses

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Weather

Convert weather forecasts between Celsius and Fahrenheit when travelling between countries using different scales.

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Cooking

Convert oven temperatures between Celsius (UK/Europe) and Fahrenheit (US) when following international recipes.

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Science

Convert between Celsius, Fahrenheit and Kelvin for physics and chemistry experiments.

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Medical

Convert body temperature readings between scales used in different countries' medical equipment.

Frequently Asked Questions

What is the formula for Celsius to Fahrenheit?

°F = (°C × 9/5) + 32. Example: 100°C = (100 × 9/5) + 32 = 180 + 32 = 212°F (boiling point of water).

What is the formula for Fahrenheit to Celsius?

°C = (°F − 32) × 5/9. Example: 98.6°F = (98.6 − 32) × 5/9 = 66.6 × 0.556 = 37°C (normal body temperature).

What is absolute zero in Celsius and Fahrenheit?

Absolute zero is 0 Kelvin = −273.15°C = −459.67°F. It is the theoretical lowest possible temperature where molecular motion stops.

Which countries use Fahrenheit?

The United States, Cayman Islands, Palau and a few other territories use Fahrenheit. Most of the rest of the world uses Celsius.