Sumyard

Temperature converter

Convert Celsius, Fahrenheit and Kelvin with the formula shown.

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Your inputs

Updates as you type

converted value

68 °F

Input
20 C
Output
68 F

Uses the Celsius/Fahrenheit offset and Kelvin absolute scale.

Calculations happen in your browser. Saving is optional.

How to use this tool

Choose Celsius, Fahrenheit or Kelvin for each side and enter the temperature.

Offsets matter as well as scale factors. Values below absolute zero are rejected.

°F = °C × 9/5 + 32; K = °C + 273.15

Worked example

68 °F · converted value

Fixed example using the settings below. Monetary examples use USD; dates and times use their stated reference values. This example stays unchanged when you edit your calculation.

Example inputs
  • Value: 20
  • From: Celsius (°C)
  • To: Fahrenheit (°F)

Method illustration: 20 °C = 68 °F = 293.15 K.

Assumptions and limits

  • Temperatures below absolute zero are invalid. Kelvin uses K, without a degree symbol.
  • Results are rounded for display; intermediate calculations use full floating-point precision.

Method reference: NIST Guide for the Use of the International System of Units

Check or report a result

Check the units, selected calculation and assumptions first. Compare the fixed example above with your inputs to identify what changed.

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