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Unit Conversion / Free online tool

Temperature Converter

Convert temperature measurements between common units with a reversible conversion.

Your inputs

Separate values with commas, spaces or new lines. Up to 200 values; use a dot for decimals.
Common conversions

More options & settings
Try a worked example

20 Celsius equals 68 Fahrenheit.

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Your result

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Compare scenarios

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Behind the answer

°F = °C × 9/5 + 32; K = °C + 273.15

How to use this converter

Convert through Celsius with scale and offset adjustments. Kelvin is an absolute temperature scale.

  1. Enter what would you like to convert?, value, from unit and review the remaining options.
  2. Select Calculate or change a value to update the result. Read the result label and units before copying.
  3. Use Reset to restore the worked starting values.

Formula and method

°F = °C × 9/5 + 32; K = °C + 273.15

US and UK volume units are explicitly distinguished. Display rounding does not change the underlying calculation. Display precision is adjustable from 0–15 decimal places; underlying factors are unchanged.

Worked example

20 °C = 68 °F.

Questions about temperature converter

Why can I not just multiply Celsius by a factor?

The Celsius and Fahrenheit scales have different zero points. Use °F = °C × 9/5 + 32: 20 °C becomes 68 °F. Kelvin is °C + 273.15; temperatures below absolute zero are invalid.

What assumptions should I check?

US and UK volume units are explicitly distinguished. Display rounding does not change the underlying calculation. Display precision is adjustable from 0–15 decimal places; underlying factors are unchanged.

Are my inputs saved?

Calculations run in your browser. We store only tool IDs for favorites and recent tools. A calculation link contains your inputs only when you explicitly choose to copy one.