This fahrenheit to celsius converter turns °F into °C as you type and shows the formula it uses. Fahrenheit is still the everyday scale in the United States, while most of the world reads weather, ovens and thermometers in Celsius, so the question comes up with every forecast, recipe and fever reading that crosses the border. It runs in your browser and spends no credits.
Fahrenheit to Celsius formula
Subtract 32, then multiply by 5/9:
°C = (°F − 32) × 5/9
Unlike length or weight, temperature is not a single multiplication, because the two scales start at different zeros. Water freezes at 32 °F (0 °C) and boils at 212 °F (100 °C), so 180 Fahrenheit degrees cover the same span as 100 Celsius degrees. That is where 5/9 comes from.
Fahrenheit to Celsius chart
| Fahrenheit | Celsius |
|---|---|
| -40 °F | -40 °C |
| 0 °F | -17.78 °C |
| 32 °F | 0 °C |
| 50 °F | 10 °C |
| 60 °F | 15.56 °C |
| 68 °F | 20 °C |
| 72 °F | 22.22 °C |
| 80 °F | 26.67 °C |
| 90 °F | 32.22 °C |
| 98.6 °F | 37 °C |
| 100.4 °F | 38 °C |
| 104 °F | 40 °C |
| 212 °F | 100 °C |
| 350 °F | 176.67 °C |
| 400 °F | 204.44 °C |
Is 100 °F a fever in Celsius
100 °F is 37.78 °C. A body temperature of 98.6 °F is the familiar 37 °C, and 100.4 °F converts to exactly 38 °C, the reading often used as the threshold for a fever. A thermometer showing 102 °F is at 38.89 °C. For medical decisions, follow the guidance your doctor uses; the converter only changes the scale.
Worked example: weather and the oven
A forecast of 75 °F: 75 − 32 = 43, and 43 × 5/9 = 23.89 °C, a mild day. In the kitchen, an American recipe that says 350 °F means 176.67 °C, which is why many European recipes round it to 180 °C. A 425 °F roast converts to 218.33 °C.
A rough mental shortcut is to subtract 30 and halve: 80 °F gives 25, against an exact 26.67 °C. It drifts further off at very high or very low temperatures, so use the exact figure for baking.
FAQ
At what temperature are Fahrenheit and Celsius equal?
At -40. Minus forty degrees is the same on both scales, which the table above shows.
Can I convert to Kelvin?
Yes. Pick K in either unit list. 0 °C is 273.15 K.
What does it cost?
It comes with the Nexin library: Nexin Lite or Nexin Pro opens it, and it spends no credits.
