How do I convert Celsius to Fahrenheit?

To convert Celsius to Fahrenheit manually, multiply the Celsius temperature by 9/5 (or 1.8) and then add 32. For example, 20°C multiplied by 1.8 is 36. Add 32 to get 68°F. You can also use our free online temperature converter for instant results.

What is absolute zero in Kelvin and Celsius?

Absolute zero is the lowest possible temperature where nothing could be colder and no heat energy remains in a substance. It is 0 Kelvin (0 K), which is equal to -273.15 degrees Celsius or -459.67 degrees Fahrenheit.

How do you convert Fahrenheit to Celsius?

To convert Fahrenheit to Celsius, subtract 32 from the Fahrenheit temperature, multiply the result by 5, and then divide by 9.

How do you convert Celsius to Fahrenheit?

To convert Celsius to Fahrenheit, multiply the Celsius temperature by 1.8 (or 9/5) and then add 32. For example, to convert 20°C: (20 × 1.8) + 32 = 68°F. You can also use our free temperature converter for instant results.

What is the formula to convert Fahrenheit to Celsius?

The formula to convert Fahrenheit to Celsius is: (°F - 32) × 5/9 = °C. First, subtract 32 from your Fahrenheit temperature, then multiply that result by 5, and finally divide by 9.

What is absolute zero?

Absolute zero is the lowest possible temperature where no heat energy remains in a substance. On the Kelvin scale, it is exactly 0 K. This is equivalent to -273.15 degrees Celsius and -459.67 degrees Fahrenheit.

Temperature Converter

Type a value into any box below to instantly convert it to all other scales.

Celsius

°C

Fahrenheit

°F

Kelvin

How to Use This Temperature Converter

Whether you are reading a recipe from another country, traveling abroad, or solving a science problem, our free Temperature Converter makes switching between scales instant and effortless. There is no need to select from complicated dropdown menus or click "Calculate"—the math happens in real-time.

Step-by-Step Guide:

Enter your known value: Click on the input box for the temperature scale you already know (Celsius, Fahrenheit, or Kelvin).
Watch it sync: As you type your number, the other two boxes will instantly update with the precise converted temperatures.
Start over: Click the "Clear Values" button to quickly empty all the boxes for your next calculation.

Common Temperature Formulas

If you ever need to perform these conversions manually for a math or science test, here are the standard formulas:

Celsius to Fahrenheit: Multiply by 9, divide by 5, then add 32.
Formula: (°C × 9/5) + 32 = °F

Fahrenheit to Celsius: Subtract 32, multiply by 5, then divide by 9.
Formula: (°F - 32) × 5/9 = °C

Temperature Converter

How to Use This Temperature Converter

Step-by-Step Guide:

Common Temperature Formulas

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