Fahrenheit to Celsius Converter (°F to °C)

How to use this calculator: fahrenheit to celsius

1. 1Enter the value measured in fahrenheit (°F).
2. 2Confirm the direction is Fahrenheit (°F) to Celsius (°C); reversing the units changes the factor or offset.
3. 3Apply °C = (°F − 32) × 5/9. The live converter performs this substitution as you type.
4. 4Read the answer in °C and keep only justified precision.

Conversion formula

To convert Fahrenheit to Celsius, subtract 32 and multiply by 5/9. Normal body temperature is 98.6 °F (37 °C) and a typical fan-oven bake at 350 °F is about 177 °C.

Temperature scales use different degree sizes and zero points, so the equation needs a multiplier and an offset. Check 0 °F = -17.77777778 °C.

Worked conversion example: Fahrenheit to Celsius

1. Given: 70 °F
2. Substitute: °C = (70 − 32) × 5/9
3. Result: 70 °F = 21.11111111 °C

Accuracy checklist

The converter keeps extra precision internally. Report only the precision supported by the original measurement and follow the required rounding rule.

Direction check: a smaller unit usually gives a larger number; temperature is an exception.

Unit definitions and SI traceability: NIST Office of Weights and Measures — SI Units.