To turn Fahrenheit into Celsius, subtract 32 and divide by 1.8. 350 °F is 176.7 °C, which recipes round to 180 °C. The calculator above shows the formula with your numbers and gives kelvin as well; choose “degrees Celsius” in the list to convert the other way.
Oven temperatures
| °F | °C (exact) | °C in recipes | UK gas mark |
|---|---|---|---|
| 250 | 121 | 120 | ½ |
| 275 | 135 | 140 | 1 |
| 300 | 149 | 150 | 2 |
| 325 | 163 | 160–170 | 3 |
| 350 | 177 | 180 | 4 |
| 375 | 191 | 190 | 5 |
| 400 | 204 | 200 | 6 |
| 425 | 218 | 220 | 7 |
| 450 | 232 | 230 | 8 |
| 475 | 246 | 240 | 9 |
For a fan (convection) oven, take about 20 °C (25 °F) off the conventional temperature.
Body temperature
| °F | °C | What it usually means |
|---|---|---|
| 96.8 | 36.0 | Low end of normal |
| 97.7 | 36.5 | Normal |
| 98.6 | 37.0 | Normal |
| 99.5 | 37.5 | Normal to slightly raised |
| 100.4 | 38.0 | Fever |
| 101.3 | 38.5 | Fever |
| 102.2 | 39.0 | High fever |
| 104.0 | 40.0 | Very high fever: seek medical advice |
Thermometers differ by where they measure (mouth, ear, forehead, armpit), so compare readings from the same method.
Weather
| °F | °C | |
|---|---|---|
| −40 | −40 | The two scales meet |
| −4 | −20 | Hard frost |
| 14 | −10 | Freezing cold |
| 32 | 0 | Water freezes |
| 50 | 10 | Cool |
| 68 | 20 | Room temperature |
| 77 | 25 | Warm |
| 86 | 30 | Hot |
| 95 | 35 | Very hot |
| 104 | 40 | Heat wave |
A quick estimate in your head
Subtract 30 and halve: 70 °F → 40 → 20 °C (exactly 21.1). The trick is perfect at 50 °F and drifts by a few degrees as you move away from it:
| °F | Exact °C | (°F − 30) ÷ 2 |
|---|---|---|
| 0 | −17.8 | −15 |
| 32 | 0 | 1 |
| 50 | 10 | 10 |
| 70 | 21.1 | 20 |
| 90 | 32.2 | 30 |
| 100 | 37.8 | 35 |
Good enough for the weather, not for baking or a fever.
Differences are not temperatures
A rise of 10 °F is a rise of 5.6 °C – you divide by 1.8 but do not subtract 32, because the offset cancels out. A forecast that says “15 degrees warmer than yesterday” in Fahrenheit means 8.3 degrees warmer in Celsius.
Kelvin
Scientists use kelvin, which starts at absolute zero (−273.15 °C, −459.67 °F). To convert, add 273.15 to Celsius: 20 °C is 293.15 K. Nothing can be colder than 0 K, so the calculator refuses temperatures below it.
In the kitchen with a foreign recipe and no Wi-Fi? Once zet4u is saved on your device, the converter works offline.
Frequently asked questions
How do I convert Fahrenheit to Celsius?
Subtract 32, then divide by 1.8. For example, 350 °F: 350 − 32 = 318, and 318 ÷ 1.8 = 176.7 °C.
How do I convert Celsius to Fahrenheit?
Multiply by 1.8, then add 32. 20 °C × 1.8 = 36, plus 32 = 68 °F.
Where are Fahrenheit and Celsius the same?
At −40. Minus forty degrees Fahrenheit is exactly minus forty degrees Celsius.
What is a fever in Fahrenheit?
Most doctors count 100.4 °F (38 °C) or higher as a fever in adults. A normal body temperature is around 98.6 °F (37 °C), give or take a degree.
What is 180 °C in a fan oven?
Fan (convection) ovens cook hotter, so recipes usually lower the temperature by about 20 °C: 180 °C conventional is about 160 °C fan.
Sources
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