Convert temperature from degrees Fahrenheit (°F) to degrees Celsius (°C) using the standard affine relationship recognized by national metrology institutes. Useful for weather data, HVAC specs, lab logs, cooking targets, and any workflow that needs SI readings from °F inputs.
Fahrenheit (°F) to Celsius (°C) Converter
Enter a value in the field below and press the button
Fahrenheit (°F)
Result in Celsius (°C)
How to use
- Enter a temperature in °F.
- Choose the number of decimal places.
- Select Convert to display °C and the calculation line.
- Use Copy Result to copy the value.
- Use Clear All to reset fields.
- The Swap button opens the Celsius to Fahrenheit calculator.
Definitions and unit facts
Fahrenheit (°F) — Temperature scale used in U.S. customary contexts. Defined by an affine mapping to kelvin via °F = 9/5·K − 459.67 and to Celsius via °F = 9/5·°C + 32. One Fahrenheit degree equals 5/9 of a kelvin or Celsius degree. Abbreviation: °F. System: U.S. customary.
Celsius (°C) — Temperature scale used with the SI. Defined from kelvin with exact offset: °C = K − 273.15 and equal degree size to kelvin. Relation to Fahrenheit: °C = (°F − 32) × 5/9. Abbreviation: °C. System: SI-related.
Conversion formula
Celsius = (Fahrenheit − 32) × 5 ÷ 9
Source: NIST — SI Units: Temperature.
Conversion table
| Fahrenheit (°F) | Celsius (°C) |
|---|---|
| -40.0 | -40.0 |
| -22.0 | -30.0 |
| -4.0 | -20.0 |
| 0.0 | -17.8 |
| 14.0 | -10.0 |
| 32.0 | 0.0 |
| 50.0 | 10.0 |
| 68.0 | 20.0 |
| 77.0 | 25.0 |
| 86.0 | 30.0 |
| 95.0 | 35.0 |
| 98.6 | 37.0 |
| 104.0 | 40.0 |
| 122.0 | 50.0 |
| 140.0 | 60.0 |
| 158.0 | 70.0 |
| 176.0 | 80.0 |
| 194.0 | 90.0 |
| 212.0 | 100.0 |
| 302.0 | 150.0 |
Real-world examples
- Absolute zero: -459.67 °F = -273.15 °C
- Household freezer setpoint: 0.00 °F = -17.78 °C
- Refrigerator setpoint: 39.20 °F = 4.00 °C
- Room temperature convention: 68.00 °F = 20.00 °C
- Normal human body temperature: 98.60 °F = 37.00 °C
- HTST milk pasteurization target: 161.00 °F = 71.67 °C
- Boiling point of water at 1 atm: 212.00 °F = 100.00 °C
- Steam sterilization setpoint: 250.00 °F = 121.11 °C
- Common baking setting: 350.00 °F = 176.67 °C
- Water triple point: 32.018 °F = 0.010 °C
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