Celsius to Fahrenheit Converter — Free | How to use and interpret results
Convert Celsius to Fahrenheit while retaining a Celsius reference in the result. You can also select Fahrenheit or Kelvin as the starting scale to compare a recipe or instrument reading.
- Runs in your browser
- Nothing is uploaded
- No signup; device limits apply
Numbers stay on your device. Nothing is sent to a server.
How to use this tool
Enter a temperature and check both unit selectors. Absolute temperatures include an offset between scales, so do not enter a temperature difference as though it were an absolute reading.
Results and examples
20 °C equals 68 °F using F=C×9/5+32, or 293.15 K. Inputs below absolute zero are not returned as a physically valid temperature.
Worked example
20 °C equals 68 °F using F=C×9/5+32, or 293.15 K. Inputs below absolute zero are not returned as a physically valid temperature.
Limitations
- Temperature differences must not use the absolute-temperature 32-degree offset.
- Apparent temperature and appliance calibration errors are not included.
Fields
| Field | Guidance and constraints |
|---|---|
| Temperature | Accepted range: -400–3000 · Input step: 0.01 |
| From | Celsius / Fahrenheit / Kelvin |
| To | Celsius / Fahrenheit / Kelvin |
Data handling
Processing stays in the current browser tab; the site does not upload tool input for the calculation itself.
Sources
Frequently asked questions
What is 20 °C in Fahrenheit?
20 °C equals 68 °F using F=C×9/5+32, or 293.15 K. Inputs below absolute zero are not returned as a physically valid temperature.
Can I use the same formula for a temperature difference?
Temperature differences must not use the absolute-temperature 32-degree offset. Apparent temperature and appliance calibration errors are not included.
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