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Temperature converter

Temperature converter: convert between Celsius, Fahrenheit and Kelvin online, free and without signing up. Pick the From and To units, type a value and read the result as you type. Nothing is uploaded: the maths runs in your browser.

How to convert temperature units online

  1. 1Type the number you want to convert
  2. 2Pick the From and To units
  3. 3Read the result, or look it up in the table
  4. The value in your unit, plus every other unit.

What happens to your numbers

  • Nothing is uploaded.The sum is done by your browser. The number you type never leaves your device.
  • Exact formulas.Fahrenheit is Celsius × 9/5 + 32, and Kelvin is Celsius + 273.15.
  • Works offline.Once the tool has been opened, it needs no connection.

What you can do

  • Convert between all 3 units, with decimals and negative numbers. The result changes as you type.
  • Example: 100 Celsius = 212 Fahrenheit.
  • Press Swap to turn the conversion around without retyping the number.
  • The table lists the value in every unit except the From unit, so one entry gives you 2 results.
  • Check oven settings, weather and lab values, or move between everyday scales and the scientific Kelvin scale.

Good to know

  • The page opens with Celsius as the From unit, Fahrenheit as the To unit and a value of 20. Change either unit at any time.
  • Results show up to 10 significant digits. Very large or very small values appear in exponent form, such as 1.500000e-7.
  • Temperatures are converted by formula, not by one factor, and the value field starts at 20 as a typical room temperature. Absolute zero is 0 Kelvin, -273.15 Celsius and -459.67 Fahrenheit.

Questions

Is this temperature converter free?

Yes. It is free and needs no account or sign-up. Nothing you type is uploaded.

How exact is the result?

The formulas are exact: Fahrenheit = Celsius × 9/5 + 32 and Kelvin = Celsius + 273.15. The result shows up to 10 significant digits.

Can I convert temperatures below zero?

Yes. Type a negative number, for example -40. It is the same in Celsius and Fahrenheit.

Which units can I convert?

Celsius, Fahrenheit and Kelvin. Pick any two of them.

Related tools

How it works

Small tools that run in your browser.

Four steps

  1. Start with a file or a task

    Drop a file, search, or pick a task.

  2. The tool opens in a window

    Open as many as you like, side by side as tabs.

  3. Results collect on the right

    Drag a result into the next tool.

  4. Save when you're done

    Saved files go to your downloads.

Who uses what

Tool sets for common jobs.

Put a tool on your home screen

The icon opens that tool, like an app.

iPhone and iPad

  1. Open the tool in Safari.
  2. Tap Share (the square with the arrow).
  3. Choose “Add to Home Screen”, then Add.

Android

  1. Open the tool in Chrome.
  2. Tap the menu (⋮) at the top right.
  3. Choose “Add to Home screen” or “Install app”.

Computer

  1. Open the tool in Chrome or Edge.
  2. Click the install icon in the address bar.
  3. Choose Install.

Skills

Claude skills we use ourselves, one job each.