Temperature Converter

The Temperature Converter is a free online tool that converts temperature values between Celsius, Fahrenheit and Kelvin instantly. No sign-up needed — enter a value, choose your units, and get an accurate result. It's a handy reference for checking weather forecasts abroad, following international recipes, or double-checking science homework.

What is a temperature converter?

Temperature scales vary by region and field: Celsius is used in most of the world and in science, Fahrenheit is common in the United States, and Kelvin is the scale used in physics and chemistry for absolute temperature. This tool converts between all three instantly, useful for weather, cooking, travel, and coursework. Because the three scales use different zero points and step sizes, a direct conversion formula — not just a rough estimate — is needed for accurate results.

How to use the Temperature Converter

1. Enter the temperature value you want to convert.
2. Select the unit to convert from — Celsius, Fahrenheit, or Kelvin.
3. Click Calculate to see the converted result.

Key features

• Converts accurately between Celsius, Fahrenheit and Kelvin.
• Useful for weather, cooking, travel, and science.
• Instant, two-way conversion with no manual formulas.
• Free and works directly in your browser.

Related tools

Working with other measurements? Try the Pressure Converter, Length Converter, or the Weight Converter.

Frequently asked questions

Is the Temperature Converter free?

Yes, completely free with no sign-up or usage limits. There's no limit on how many conversions you can perform.

How do I convert Celsius to Fahrenheit?

Multiply the Celsius value by 9/5 and add 32 to get Fahrenheit. The reverse conversion subtracts 32 first, then multiplies by 5/9 to get back to Celsius.

What is 0 Kelvin?

Zero Kelvin is absolute zero, the theoretical point where all molecular motion stops — equal to -273.15°C. The Kelvin scale is widely used in scientific research because it has no negative values.

Why does the US use Fahrenheit?

The United States adopted Fahrenheit early on and never fully transitioned to the metric-based Celsius scale used by most of the world. Most of the rest of the world switched to Celsius decades ago as part of broader metrication efforts.