How to use it
- Enter the temperature.
- Choose the scale you're converting from and to.
- Read the result, also shown in kelvin.
- Use the swap button to go the other way.
The formulas
- °F = °C × 9/5 + 32
- °C = (°F − 32) × 5/9
- K = °C + 273.15
Example: 25 °C × 9/5 = 45, plus 32 = 77 °F. And 350 °F − 32 = 318, × 5/9 = 176.7 °C.
A quick estimate from Celsius: double it and add 30 (25 °C → 80 °F). It's close for everyday weather but drifts at high temperatures, so use the exact result for cooking.
Temperature chart
| °C | °F | What it means |
|---|---|---|
| −40 | −40 | Both scales meet here |
| −18 | 0 | Freezer temperature |
| 0 | 32 | Water freezes |
| 10 | 50 | Cool spring day |
| 20 | 68 | Room temperature |
| 25 | 77 | Warm day |
| 30 | 86 | Hot day |
| 37 | 98.6 | Typical body temperature |
| 100 | 212 | Water boils (at sea level) |
| 180 | 356 | Moderate oven |
Oven temperatures
Recipes from outside the US give oven temperatures in Celsius. Common settings:
| °F | °C |
|---|---|
| 300 °F | 149 °C |
| 325 °F | 163 °C |
| 350 °F | 177 °C |
| 375 °F | 191 °C |
| 400 °F | 204 °C |
| 425 °F | 218 °C |
| 450 °F | 232 °C |
European recipes usually round to the nearest 10 °C (180 °C for 350 °F). If your oven has a fan (convection) setting, recipes often suggest about 25 °F (or 15–20 °C) lower.
Why the scales differ
Celsius sets 0° at the freezing point and 100° at the boiling point of water, so one Celsius degree is 1/100 of that range. Fahrenheit puts those points at 32° and 212°, 180 degrees apart. That's why a change of 1 °C equals a change of 1.8 °F, and why you add or subtract 32 to line up the zero points.
Scientists use kelvin, which starts at absolute zero (−273.15 °C, −459.67 °F). For that conversion, see Celsius to Kelvin.
Fever and body temperature
Normal body temperature is often given as 98.6 °F (37 °C), but healthy readings vary from person to person and through the day. Many health sources treat 100.4 °F (38 °C) and above as a fever. Thermometers sold outside the US show Celsius, so this conversion comes up when traveling or reading medical advice from other countries. This converter is for unit conversion only and isn't medical advice; ask a doctor if you're unsure about a reading.
Weather in other countries
Most of the world reports weather in Celsius. A few anchors make it easier to read a foreign forecast: 0 °C is freezing, 10 °C is jacket weather, 20 °C is pleasant, 30 °C is hot and 40 °C (104 °F) is a heat wave. Below zero, every 5 °C is 9 °F: −5 °C is 23 °F and −10 °C is 14 °F.
Frequently asked questions
What is 37 °C in Fahrenheit?
37 °C is 98.6 °F, the traditional value for normal body temperature.
What is 350 °F in Celsius?
350 °F is 176.7 °C. Most recipes round it to 175 or 180 °C.
At what temperature are Celsius and Fahrenheit equal?
At −40. −40 °C is exactly −40 °F.
Is there an easy way to estimate °C to °F?
Double the Celsius value and add 30. It's within a few degrees for normal weather temperatures.
How do I convert a temperature difference?
For a change in temperature, only multiply by 1.8 (or divide by 1.8). A 10 °C rise is an 18 °F rise; the +32 doesn't apply.
Last updated: November 12, 2026