Celsius to Fahrenheit Converter
Convert degrees Celsius (°C) to degrees Fahrenheit (°F). The two scales start at different zero points, so the conversion uses a formula rather than a single factor: °F = °C × 9/5 + 32.
Formula: multiply the source value by 33.8
Quick Conversions
About this tool
On the Celsius scale, water freezes at 0 °C and boils at about 100 °C at sea-level pressure. On the Fahrenheit scale, water freezes at 32 °F and boils at about 212 °F at sea-level pressure.
How to use it
- Type a value in degrees Celsius in the first field. The unit menus start on °C → °F.
- Read the result in degrees Fahrenheit. It updates as you type; use Precision to choose how many decimals are shown.
- Press the swap button, or open the Fahrenheit to Celsius converter, to convert degrees Fahrenheit back to degrees Celsius.
°F = °C × 9/5 + 32
°C = (°F − 32) × 5/9
Examples
0 °C to °F (water freezes)
Using °F = °C × 9/5 + 32: 0 °C = 32 °F.
37 °C to °F (typical body temperature)
Using °F = °C × 9/5 + 32: 37 °C = 98.6 °F.
100 °C to °F (water boils at sea level)
Using °F = °C × 9/5 + 32: 100 °C = 212 °F.
Degrees Celsius to degrees Fahrenheit conversion table
| Degrees Celsius (°C) | Degrees Fahrenheit (°F) |
|---|---|
| -40 | -40 |
| -20 | -4 |
| -10 | 14 |
| 0 | 32 |
| 10 | 50 |
| 15 | 59 |
| 20 | 68 |
| 25 | 77 |
| 30 | 86 |
| 37 | 98.6 |
| 40 | 104 |
| 50 | 122 |
| 100 | 212 |
Degrees Fahrenheit to degrees Celsius (reverse)
| Degrees Fahrenheit (°F) | Degrees Celsius (°C) |
|---|---|
| -40 | -40 |
| 0 | -17.7778 |
| 32 | 0 |
| 40 | 4.44444 |
| 50 | 10 |
| 60 | 15.5556 |
| 68 | 20 |
| 70 | 21.1111 |
FAQ
What is the formula to convert °C to °F?
°F = °C × 9/5 + 32. For example, 10 °C is 50 °F.
How do I convert °F back to °C?
Use the reverse formula, °C = (°F − 32) × 5/9.
At what temperature are Celsius and Fahrenheit equal?
At −40. That is, −40 °C is the same temperature as −40 °F.
Is there a quick mental shortcut?
Double the Celsius value and add 30. It is close for everyday weather (20 °C gives 70 °F instead of the exact 68 °F), but the error grows at high and low temperatures.
Is the conversion exact?
Yes. The scale definitions (0 °C = 273.15 K, and one Fahrenheit degree is 5/9 of a kelvin) are exact. Results are only rounded for display.