Temperature converters
Temperature scales require an offset as well as a scale factor. Choose an exact direction below, or open the universal converter for all compatible units.
Example temperature conversions
Start with a calculated reference value, then open the tool to enter your own measurement. Results marked ≈ are rounded for display.
- Celsius to Fahrenheit20 °C = 68 °F
Understanding temperature
Temperature scales include offsets
Absolute temperatures in Celsius, Fahrenheit and kelvin need an offset as well as a scale factor. A change of one Celsius degree is a change of 1.8 Fahrenheit degrees, but 1 °C is not 1.8 °F as an absolute temperature.
How to verify a conversion
Negative Celsius or Fahrenheit values can be valid, but temperatures below absolute zero are not. The conversion engine validates the physical lower bound.
Source definitions: NIST Guide to the SI. See our conversion methodology for calculation and rounding details.
Accurate calculations, no guesswork
Every converter uses consistent unit definitions and returns an interactive result you can verify. For multiple measurements, use the batch converter.
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