To convert Celsius to Fahrenheit, multiply by 1.8 (9/5) and add 32. 25 °C is 77 °F, 0 °C is 32 °F, and 100 °C is 212 °F.
Celsius is the scale for weather forecasts in almost every country, for science and for European and Australian recipes. This page converts it to the Fahrenheit used in the US.
How to use the celsius to fahrenheit converter
- Type the value in Celsius into the box. Decimals and negative values are fine.
- The result in Fahrenheit updates as you type, along with the working.
- Need the other way? Switch the direction menu, or open the fahrenheit to celsius converter.
Formula
The Fahrenheit and Celsius scales differ in both size and zero point: water freezes at 32 °F / 0 °C and boils at 212 °F / 100 °C at sea level, so 180 Fahrenheit degrees span the same range as 100 Celsius degrees (ratio 9/5). The formulas are exact.
Worked example
The forecast says 25 °C. What is that in Fahrenheit?
- Multiply by 1.8: 25 × 1.8 = 45.
- Add 32: 45 + 32 = 77.
- Result: 77 °F, a warm day.
Oven example: 180 °C × 1.8 + 32 = 356 °F, so set a US oven to 350 °F.
Celsius to Fahrenheit chart
Common values, rounded to 2 decimal places.
| Celsius (°C) | Fahrenheit (°F) |
|---|---|
| -40 °C | -40 °F |
| -20 °C | -4 °F |
| -18 °C | -0.4 °F |
| -10 °C | 14 °F |
| -5 °C | 23 °F |
| 0 °C | 32 °F |
| 4 °C | 39.2 °F |
| 5 °C | 41 °F |
| 10 °C | 50 °F |
| 15 °C | 59 °F |
| 20 °C | 68 °F |
| 22 °C | 71.6 °F |
| 25 °C | 77 °F |
| 30 °C | 86 °F |
| 35 °C | 95 °F |
| 37 °C | 98.6 °F |
| 38 °C | 100.4 °F |
| 40 °C | 104 °F |
| 100 °C | 212 °F |
| 160 °C | 320 °F |
| 180 °C | 356 °F |
| 200 °C | 392 °F |
| 220 °C | 428 °F |
| 250 °C | 482 °F |
Everyday Celsius landmarks
- Fridge and freezer: food-safety guidance is a fridge at or below 4 °C (39.2 °F) and a freezer at −18 °C (−0.4 °F, usually given as 0 °F).
- Body: 37 °C is 98.6 °F; 38 °C (100.4 °F) is a fever.
- Weather: 10 °C = 50 °F, 20 °C = 68 °F, 30 °C = 86 °F, 40 °C = 104 °F.
- Fan ovens: European recipes may give a fan temperature about 20 °C lower than conventional.
Quick mental math
Double it and add 30. 20 °C → 40 + 30 = 70 °F (exact: 68). It's handy for weather but runs high in hot temperatures, so use the exact formula for ovens.
Related conversions
Going the other way: fahrenheit to celsius converter. Related pages: . For other units in the same family, use the full temperature converter.
Caveats and assumptions
- Values below −273.15 °C (absolute zero) are flagged as impossible.
- Results show up to 10 significant digits; the chart is rounded for reading. Keep full precision for engineering, medical or legal work.
Frequently asked questions
What is the formula for Celsius to Fahrenheit?
°F = °C × 9/5 + 32. Multiply first, then add 32.
What is 37 °C in Fahrenheit?
98.6 °F.
What is 180 °C in Fahrenheit?
356 °F. US recipes use 350 °F.
What is 0 °C in Fahrenheit?
32 °F, the freezing point of water.
Sources
- NIST — SI Units: Temperature — Fahrenheit–Celsius formulas
- NIST SP 811 Appendix B.9 — Conversion factors — temperature conversion formulas
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