When to use this converter
Convert Fahrenheit temperature readings to Celsius. A temperature difference uses a scale factor without the 32-degree offset.
Explore the temperature scales calculators for other questions in this topic. For a related calculation, use the Kelvin to Celsius Converter: Convert absolute temperature in kelvins to Celsius.
PUTTING IT INTO PRACTICE
Fahrenheit to Celsius: a worked example
The values below are an illustrative example, not a recommendation. Replace them with measurements or assumptions that match your question.
| Input | Example value |
|---|---|
| Temperature (°F) | 68 |
| Result | 20 °C |
- Check the input labels and enter the example values above.
- Apply the relationship: °C = (°F − 32) × 5/9.
- The result is 20 °C, rounded for display.
How to interpret your result
A temperature difference uses a scale factor without the 32-degree offset.
Reading conversions include offsets between scale zero points. Temperature differences follow scale factors without the same offsets. The supported physical lower limit is absolute zero.
Frequently asked questions
Can I convert a temperature difference with the reading formula?
Not directly. Differences use the scale factor without adding or subtracting the zero-point offset.
How do I use the fahrenheit to celsius converter?
Enter temperature (°f). The result updates automatically. Use the units shown beside each input; the example values illustrate the method.
Which formula does this calculator use?
°C = (°F − 32) × 5/9.
What should I check before using the result?
A temperature difference uses a scale factor without the 32-degree offset.
How are results rounded?
Scalar numbers display up to six decimal places, with scientific notation for very large or small values. Text, fraction, date and schedule outputs use the format described on the tool. Intermediate calculations use JavaScript floating-point arithmetic. Keep sensible precision for your measurements.
Further reading
For background on this topic, see NIST: SI conversion factors ↗. This is a topic reference, not an external review or endorsement of this tool.
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