Converters
12
Fahrenheit to Celsius Converter
Convert fahrenheit to celsius instantly with the formula, worked examples, rounding guidance, and related temperature conversions.
Units
85
Mode
Live
Pair-specific conversion guide
Fahrenheit to Celsius formula
This converter calculates Celsius from Fahrenheit using the formula C = (F - 32) × 5/9. For example, 1°F equals -17.22°C, 5°F equals -15°C, and 10°F equals -12.22°C. The conversion is based on the Kelvin scale, the SI base unit for temperature.
Formula model
C = (F - 32) * 5 / 9
1 Fahrenheit equals
Quick factor: 1 deg F = -17.2222222222 deg C.
To quickly estimate, subtract 30 from Fahrenheit and halve the result for a rough Celsius value.
Remember that 32°F equals 0°C, the freezing point of water, as a reference for mental conversions.
Temperature conversions can include both a scale and an offset, so a multiplication factor alone is not always sufficient.
Precision and rounding
The calculation uses the catalog's fixed scale and offset definitions between deg F and deg C. Full decimal precision is kept for the calculation; only the displayed value is rounded for readability.
Reference: NIST conversion factorsTemperature
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Conversion table
1 Fahrenheit equals
| Unit | Value |
|---|---|
| Celsius deg C | -17.2222222222 |
| Kelvin K | 255.927777778 |
FAQ
Fahrenheit to Celsius questions
Why does 1°F convert to -17.22°C?
The formula C = (F - 32) × 5/9 gives -17.222... for 1°F because the Fahrenheit scale sets 32°F as the freezing point of water, so 1°F is 31 degrees below that, and multiplying by 5/9 yields the Celsius equivalent.
Is the conversion formula the same for all temperatures?
Yes, the formula C = (F - 32) × 5/9 applies to any Fahrenheit value, as it is derived from the linear relationship between the two scales based on the Kelvin base unit.