Subtract 32 from the Fahrenheit value, then multiply by 5/9. Oven settings, U.S. weather and fever thermometers are the usual reasons to convert.
How to use the Fahrenheit to Celsius Converter
- Type the number of degrees Fahrenheit into the Degrees Fahrenheit field. Decimals such as 50 are fine.
- Read the answer in Degrees Celsius – it updates as you type, with no button to press.
- To convert the other way, type into Degrees Celsius and the degrees Fahrenheit are recalculated.
- Press Copy results to copy both values with the page title, or Copy link to share this exact conversion.
This page converts only °F ⇄ °C. Need a different unit? Use the general temperature converter, where you can choose any “from” and “to” unit.
How it works
Degrees Fahrenheit and degrees Celsius use different zero points as well as different sized degrees, so this is not a simple multiplication: the calculator applies the formula °C = (°F − 32) × 5/9, which first scales the value and then shifts it by the offset between the two zero points. Going back uses the inverse, °F = (°C − -17.777778) ÷ 0.55555556. Results are calculated at full precision and rounded only for display, so typing into either field gives consistent values.
How to convert degrees Fahrenheit to degrees Celsius
- Start with the value in degrees Fahrenheit: 100 °F.
- Apply the formula °C = (°F − 32) × 5/9.
- The result is 37.777778 °C.
- To go back, use °F = (°C − -17.777778) ÷ 0.55555556.
°F to °C conversion table
| Degrees Fahrenheit | Degrees Celsius | Degrees Celsius | Degrees Fahrenheit |
|---|---|---|---|
| -40 °F | -40 °C | -40 °C | -40 °F |
| 20 °F | -6.6666667 °C | 0 °C | 32 °F |
| 40 °F | 4.4444444 °C | 20 °C | 68 °F |
| 68 °F | 20 °C | 37 °C | 98.6 °F |
| 72 °F | 22.222222 °C | 100 °C | 212 °F |
| 80 °F | 26.666667 °C | 180 °C | 356 °F |
| 98.6 °F | 37 °C | 200 °C | 392 °F |
| 104 °F | 40 °C | ||
| 300 °F | 148.88889 °C | ||
| 375 °F | 190.55556 °C | ||
| 425 °F | 218.33333 °C | ||
| 500 °F | 260 °C |
What is a degree Fahrenheit?
The Fahrenheit scale, proposed by Daniel Fahrenheit in 1724, puts water’s freezing point at 32 °F and boiling point at 212 °F. It is the everyday scale in the United States.
What is a degree Celsius?
The Celsius scale sets 0 °C at the freezing point and 100 °C at the boiling point of water at sea level. Since 2019 it is defined from the kelvin: °C = K − 273.15.
Common mistakes to avoid
Forgetting the offset (°f is not just °c × 1.8), converting temperature differences with the full formula (a change of 10 °c is a change of 18 °f, with no +32), and writing “degrees kelvin”.
Formula
°C = (°F − 32) × 5/9Worked example
Inputs — Degrees Fahrenheit: 100 °F.
Results — Degrees Celsius = 37.77777778 °C.
Frequently asked questions
What is 350 °F in Celsius?
About 177 °C, a common oven setting.
What is 100 °F in Celsius?
About 37.8 °C.
How do I convert degrees Fahrenheit to degrees Celsius?
Use °C = (°F − 32) × 5/9. For example, 100 °F = 37.777778 °C.
How do I convert degrees Celsius back to degrees Fahrenheit?
Use °F = (°C − -17.777778) ÷ 0.55555556, or type the value into the degrees Celsius field above.
What is 50 °F in degrees Celsius?
50 °F = 10 °C.
What is 20 °F in degrees Celsius?
20 °F = -6.6666667 °C.
Is this conversion exact?
Yes. The factor comes from the official definitions of both units (NIST and the SI), so the only difference you may see is rounding in the last displayed digit.
Can I convert to other units on this page?
This page converts only between degrees Fahrenheit and degrees Celsius. To pick any temperature unit, use the general temperature converter linked under Related calculators.
What formula does the Fahrenheit to Celsius Converter use?
°C = (°F − 32) × 5/9.