Temperature conversion
Convert Celsius to Fahrenheit
°F = (°C × 9/5) + 32. Enter any temperature below for an exact conversion.
How to convert Celsius to Fahrenheit
- Enter the temperature in Celsius.
- The Fahrenheit equivalent appears immediately.
- Swap the units to convert in the opposite direction.
Celsius to Fahrenheit formula
°F = (°C × 9/5) + 32
Unlike length or mass conversions, temperature requires both a scale factor and an offset, because 0°C and 0°F are different temperatures. This also means temperature differences convert differently from temperature values: a rise of 10°C is a rise of 18°F, not 50°F.
The mental shortcut: double the Celsius and add 30. It is accurate within about 3 degrees between 0°C and 30°C, which covers nearly all weather.
Celsius to Fahrenheit conversion table
| Celsius | Fahrenheit | What it feels like |
|---|---|---|
| -40°C | -40°F | Extreme cold |
| 0°C | 32°F | Freezing |
| 10°C | 50°F | Cold |
| 20°C | 68°F | Comfortable |
| 25°C | 77°F | Warm |
| 30°C | 86°F | Warm |
| 37°C | 98.6°F | Hot |
| 100°C | 212°F | Boiling |
Why do the scales differ at all?
Defined by the freezing (0°) and boiling (100°) points of water at standard pressure. Used for weather everywhere except the United States.
Devised by Daniel Fahrenheit in 1724. Water freezes at 32° and boils at 212°. Used for weather in the United States and, informally, in the UK for hot summer days.
−40 is the one temperature where the two scales agree, which is a consequence of their different scale factors and offsets intersecting at that point.
Frequently asked questions
What is 20°C in Fahrenheit?
20°C is 68°F — a mild room temperature.
What is normal body temperature?
37°C, or 98.6°F. The 98.6 figure comes from a 19th-century study; more recent research puts the average slightly lower, around 36.6°C or 97.9°F, and it varies by time of day and by person.
At what temperature are Celsius and Fahrenheit equal?
−40. It is the only point where the two scales give the same number, which is why −40 degrees needs no unit stated.
Which countries use Fahrenheit?
The United States, its territories, the Cayman Islands, Liberia and a few others. The UK uses Celsius officially but Fahrenheit still appears informally in tabloid weather reporting for hot days.
How do I convert a temperature difference?
Use only the scale factor, not the offset. A change of 1°C is a change of 1.8°F. Applying the +32 to a difference is a common error.
Is my input uploaded?
No. The conversion runs in your browser.