Fahrenheit to Celsius Converter
Enter the temperature in fahrenheit below to convert it to celsius.
Convert Fahrenheit to Celsius
Enter a value in fahrenheit (°F) to convert to celsius (°C).
Fahrenheit to Celsius Conversion Table
Table showing various fahrenheit measurements converted to celsius. Click any preset value or arrow to load it into the converter.
| Fahrenheit (°F) | Celsius (°C) |
|---|---|
| -40 °F | -40 °C |
| -20 °F | -28.8888889 °C |
| -10 °F | -23.3333333 °C |
| 0 °F | -17.7777778 °C |
| 1 °F | -17.2222222 °C |
| 2 °F | -16.6666667 °C |
| 5 °F | -15 °C |
| 10 °F | -12.2222222 °C |
| 15 °F | -9.4444444 °C |
| 20 °F | -6.6666667 °C |
How to Convert Fahrenheit to Celsius
To convert fahrenheit (°F) to celsius (°C), apply the thermodynamic scale offset formula rather than a single multiplication factor because the two temperature scales have different zero points.
You can use this standard formula to convert fahrenheit to celsius:
Each temperature reading in fahrenheit is scaled and shifted by the zero-point offset to obtain the exact temperature in celsius.
For example, here's how to convert 72 °F to celsius using the formula above:
How Many Celsius Are in a Fahrenheit?
On the Fahrenheit scale, a reading of 1 °F corresponds to -17.2222222 °C on the Celsius scale.
Our fahrenheit to celsius calculator automatically converts your temperature measurements with full decimal and scientific precision across US customary, imperial, and SI metric standards.
Fahrenheit and celsius are both units used to measure temperature. Keep reading to learn more about each unit.
What Is a Fahrenheit?
Temperature scale where water freezes at 32 °F and boils at 212 °F. It serves as a primary reference unit for measuring temperature across scientific and practical applications. [1]
The fahrenheit is classified as a US customary unit of temperature. Fahrenheit can be abbreviated as °F; for example, 1 fahrenheit can be written as 1 °F.
When working with fahrenheit (°F) in formulas or technical specifications, always verify whether your target system uses SI metric, US customary, or British imperial standards.
In practice, fahrenheit (°F) are widely used across standard temperature applications within US customary workflows, engineering documentation, and technical data sheets.
What Is a Celsius?
Temperature scale where water freezes at 0 °C and boils at 100 °C. It serves as a primary reference unit for measuring temperature across scientific and practical applications. [2]
The celsius is classified as an International System of Units (SI) unit of temperature. Celsius can be abbreviated as °C; for example, 1 celsius can be written as 1 °C.
As the primary coherent reference unit for temperature in this category, all other temperature units are mathematically anchored to the celsius (°C).
In practice, celsius (°C) are widely used across standard temperature applications within International System of Units (SI) workflows, engineering documentation, and technical data sheets.
When converting temperature between fahrenheit (°F) and celsius (°C), keep full floating-point precision (1 °F = -17.2222222 °C; 1 °C = 33.8 °F) during intermediate calculations and round only the final celsius figure to match your instrument tolerance.
More Fahrenheit & Celsius Conversions
Need to calculate in the opposite direction? Use our celsius to fahrenheit converter (°C to °F) to switch your starting unit immediately. You can also explore related tools such as converting kelvin to celsius, converting rankine to celsius, or converting fahrenheit to kelvin.
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Frequently Asked Questions
References
- [1]NIST OWM StandardNIST OWM (SI Units — Temperature)·Temperature Metrology Standard — Fahrenheit (°F) to Celsius (°C)
- [2]BIPM SpecificationBIPM (SI Base Unit: Kelvin (K))·Unit Specifications: Fahrenheit (°F) & Celsius (°C)
- [3]NIST SP 811 ReferenceNIST SP 811 (NIST SP 811 App. B.9 (Heat & Temp))·Conversion Factors & Mathematical Basis (°F to °C)