Celsius to Fahrenheit Converter
Multiply the Celsius temperature by 9/5 (that is, 1.8), then add 32 to get Fahrenheit. Unlike length or weight, this is not a single multiplication: the two scales also start at different points, so the 32 matters. 100 °C = 212 °F, the boiling point of water at standard atmospheric pressure.
-40 is the one temperature where the two scales agree: -40 °C = -40 °F.
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(opens in a new tab)How to convert Celsius to Fahrenheit
Formula: °F = (°C × 9/5) + 32
Zero degrees Celsius is the freezing point of water and is 32 °F on the Fahrenheit scale. A change of 1 °C is a change of 1.8 °F, so converting a temperature difference uses the 9/5 but not the 32.
Worked example: 25 °C to Fahrenheit
This result is complete, not rounded.
Convert 25 °C
Input
25 °C
Output
(25 × 9/5) + 32 = 77 °F
Common Celsius to Fahrenheit conversions
| Celsius (°C) | Fahrenheit (°F) |
|---|---|
| -40 °C | -40 °F |
| 0 °C | 32 °F |
| 10 °C | 50 °F |
| 20 °C | 68 °F |
| 25 °C | 77 °F |
| 30 °C | 86 °F |
| 37 °C | 98.6 °F |
| 100 °C | 212 °F |
When you need to convert Celsius to Fahrenheit
- Weather: a forecast in Celsius read on a Fahrenheit thermometer, or the other way round when travelling.
- Cooking: an oven recipe at 180 °C is 356 °F.
- Room temperature: 20 °C = 68 °F and 25 °C = 77 °F.
- Body temperature context: 37 °C = 98.6 °F. This page only converts the number and does not interpret a reading medically.
Things worth knowing
- Converting an oven temperature does not adjust for a fan oven. If a recipe gives separate fan and conventional temperatures, convert the one that matches your oven.
Converting back and related converters
To go the other way, use the Fahrenheit to Celsius Converter, which applies °C = (°F - 32) × 5/9. For any other pair of units, open the Unit Converter, or browse every unit converter.
- KM to Miles Converter: distances are the other thing that changes when you travel between systems.
- KG to LBS Converter: to convert weights between metric and US units.
Frequently asked questions
How do I convert Celsius to Fahrenheit?
Multiply by 9/5 (1.8) and add 32. For 25 °C, (25 × 9/5) + 32 = 77 °F.
Why is -40 the same in Celsius and Fahrenheit?
Set both scales equal in the formula: x = (x × 9/5) + 32. Rearranging gives x × 4/5 = -32, so x = -40. It is the only temperature where the two readings match.
What is a quick way to estimate Fahrenheit?
Double the Celsius value and add 30. For 20 °C that gives 70 °F, against an exact 68 °F. The estimate drifts further from the true value the hotter or colder it gets.
What is 0 °C in Fahrenheit?
0 °C = 32 °F, the freezing point of water.
Is a 1 degree change in Celsius the same as in Fahrenheit?
No. A change of 1 °C equals a change of 1.8 °F, because there are 180 Fahrenheit degrees between freezing and boiling and 100 Celsius degrees.