degrees Fahrenheit to degrees Celsius converter
1 °F = -17.2222222222 °C. Type a value in either box — the other side updates instantly, using the exact definition factor, not a rounded shortcut. US recipes and weather reports use Fahrenheit; science and most of the world use Celsius. Water freezes at 32 °F and boils at 212 °F.
Rate: 1 °F = -17.2222222222 °C · 1 °C = 33.8 °F
Formula and a worked example
Celsius = (Fahrenheit − 32) × 5/9. Worked example: 98.6 °F − 32 = 66.6, times 5/9 gives 37 °C.
Where the factor comes from: The Celsius and Fahrenheit scales cross at exactly −40: −40 °C = −40 °F. Factors on UnitPairs follow the NIST definitions, so results agree between pages to the last digit shown.
degrees Fahrenheit to degrees Celsius chart
| degrees Fahrenheit (°F) | degrees Celsius (°C) |
|---|---|
| -40 | -40 |
| -4 | -20 |
| 14 | -10 |
| 32 | 0 |
| 50 | 10 |
| 68 | 20 |
| 86 | 30 |
| 98.6 | 37 |
| 104 | 40 |
| 122 | 50 |
| 212 | 100 |
Questions
How many degrees Celsius are in one degrees Fahrenheit?
Exactly -17.2222222222 °C — that is the rate this converter applies in both directions.
How do I convert °F to °C by hand?
Subtract 32 from the Fahrenheit value, multiply by 5, then divide by 9. The worked example above walks through 98.6 °F step by step.
Where are Celsius and Fahrenheit the same?
At −40. It is the only point where the two scales agree: −40 °C = −40 °F, which you can check in the converter above.
How accurate is this converter?
The factors are the exact international definitions, so the only rounding is in the display — results are shown to six decimal places, and the underlying value is never pre-rounded.
Related conversions
- degrees Celsius to degrees Fahrenheit — the reverse of this page
- degrees Celsius to degrees Fahrenheit
- Height converter — centimetres to feet and inches
- Full conversion chart — every pair on one page