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Temperature Converter

Convert temperatures between Celsius, Fahrenheit, and Kelvin with standard scientific formulas. Free, client-side, and instant in your browser.

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How to use Temperature Converter

  1. 1

    Enter the temperature reading.

  2. 2

    Select your source scale (Celsius, Fahrenheit, or Kelvin).

  3. 3

    Select your target scale and click Convert.

Capabilities

  • Converts between Celsius (°C), Fahrenheit (°F), and Kelvin (K)
  • Evaluates exact affine conversion formulas including degree offsets
  • Scientific calibration with support for negative and absolute zero temperatures

How Temperature Scale Conversions Work

Unlike linear dimensional measurements (such as length or mass), temperature scales do not share a common zero point. Celsius and Kelvin share the same degree increment but differ by an offset of 273.15, while Fahrenheit uses a smaller degree scale (1.8 Fahrenheit degrees per 1 Celsius degree) with freezing pegged at 32°F.

Standard Temperature Conversion Formulas

Celsius to Fahrenheit

°F = (°C * 1.8) + 32

Fahrenheit to Celsius

°C = (°F - 32) / 1.8

Celsius to Kelvin

K = °C + 273.15

Worked Example: Boiling Point of Water (100°C)

Formula: (100 * 1.8) + 32

Multiplication: 180 + 32 = 212°F

Kelvin Conversion: 100 + 273.15 = 373.15 K

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Privacy & Processing

This tool operates in a sandbox directly inside your web browser. All parsing, processing, and downloads are rendered locally. Your file size, metadata, and contents never cross the network. It works completely offline.

Frequently Asked Questions

What is the formula to convert Celsius to Fahrenheit?

Multiply the Celsius temperature by 1.8 (or 9/5) and add 32: F = (C * 1.8) + 32. For example, 20°C * 1.8 = 36 + 32 = 68°F.

What is the formula to convert Fahrenheit to Celsius?

Subtract 32 from the Fahrenheit temperature and divide by 1.8 (or multiply by 5/9): C = (F - 32) / 1.8. For example, (98.6°F - 32) / 1.8 = 37°C.

What is absolute zero in Kelvin, Celsius, and Fahrenheit?

Absolute zero (the theoretical absence of all thermal energy) equals 0 Kelvin (0 K), -273.15°C, and -459.67°F.

At what temperature do Celsius and Fahrenheit read the same value?

Celsius and Fahrenheit are identical at -40 degrees: -40°C equals -40°F.

Is this temperature converter free to use?

Yes. It executes standard affine temperature calculations locally in your browser with zero data tracking.

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