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Temperature

Convert temperatures locally between Celsius, Fahrenheit and Kelvin. No upload, in your browser.

This calculator gives a non-binding, model-based estimate and is not financial, tax or legal advice. More in the disclaimer
Value
From
  • Celsius (°C)
  • Fahrenheit (°F)
  • Kelvin (K)
To
  • Celsius (°C)
  • Fahrenheit (°F)
  • Kelvin (K)

Result

212 °F
Result
No upload100% local
Your content stays with youno third-party access
Servers in GermanyGDPR by design
Independently auditedTLS A+ · HTTP headers A+
Is my file uploaded?

No. Everything runs in your browser - your file never leaves your device. How this is verifiable

Temperature is given on three scales depending on the region: Celsius (in most countries), Fahrenheit (mainly in the USA) and Kelvin (in science and engineering). When reading American weather reports, baking recipes or scientific texts you need to convert between them. This converter takes a value on one scale and gives it on another.

Unlike lengths or weights the conversion is not just a factor but a linear formula with an offset: Fahrenheit is Celsius times nine fifths plus thirty-two, Kelvin is Celsius plus 273.15. Internally your value is first converted to Celsius and from there to the target scale. At exactly minus 40 degrees Celsius and Fahrenheit meet - there both scales show the same value.

The Kelvin scale starts at absolute zero, the lowest possible temperature (zero Kelvin equals minus 273.15 degrees Celsius). Negative Kelvin values do not exist physically; the calculator still converts your input purely mathematically. The calculation runs entirely locally in your browser in pure JavaScript - nothing is uploaded or stored. The display rounds to two decimals.

Specifications

Specifications
Input formatsForm inputs (no file)
ProcessingLocally in your browser (JavaScript)
File uploadNone

In 3 steps

  1. Enter the temperature value (negatives allowed).
  2. Choose the source scale (From) and target scale (To).
  3. Read off the converted temperature.

Limitations: Converts temperatures between Celsius, Fahrenheit and Kelvin (Fahrenheit = Celsius x 9/5 + 32; Kelvin = Celsius + 273.15). Negative inputs are allowed; physically impossible values below absolute zero are still converted mathematically. The display rounds to two decimals.

FAQ

Are my inputs uploaded?

No. The conversion runs entirely locally in the browser (pure JavaScript); your input never leaves your device and is not stored.

How do I convert Celsius to Fahrenheit?

Multiply the Celsius value by nine fifths and add 32. For example, 100 degrees Celsius is 212 degrees Fahrenheit. The calculator does this automatically.

At what temperature are Celsius and Fahrenheit equal?

At exactly minus 40 degrees: minus 40 degrees Celsius equals minus 40 degrees Fahrenheit. This is the only point where both scales show the same value.

What is absolute zero?

The lowest possible temperature: zero Kelvin, which is minus 273.15 degrees Celsius. It cannot get colder than that physically.

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