Celsius to Fahrenheit●
Degrees Celsius in. Degrees Fahrenheit out. Convert weather, cooking and body temperature.
Temperature
Convert a temperature reading. Values below absolute zero are rejected.
Use a decimal point, for example 2.54. Scientific notation works too: 1e3.
Try a value
Pick an example to startThe formula
°F = °C × 9/5 + 32
Multiply the Celsius temperature by 9/5 (that is 1.8), then add 32 to get Fahrenheit. The scales meet at −40, where −40 °C equals −40 °F.
A worked example
For 25 °C, multiply 25 by 9/5 to get 45, then add 32. The result is 77 °F.
25 × 9/5 + 32 = 77 °F
Quick reference
Reference values are rounded to 6 decimal places. Use the converter above for other values or precision.
| Celsius (°C) | Fahrenheit (°F) |
|---|---|
| -40 | -40 |
| -10 | 14 |
| 0 | 32 |
| 10 | 50 |
| 20 | 68 |
| 25 | 77 |
| 30 | 86 |
| 37 | 98.6 |
| 100 | 212 |
All equivalent units
The same value, in every supported unit.
Temperature conversions
For weather, cooking and body temperature.
Use this conversion for weather forecasts, oven temperatures and body temperature. Water freezes at 0 °C (32 °F) and boils at 100 °C (212 °F) at standard pressure. This page converts a temperature on the scale. To convert a difference between two temperatures, switch to Difference in the mode control, because a change of 1 °C is a change of 1.8 °F.
Calculation details & precision
Temperature readings include scale offsets: °F = °C × 9/5 + 32, K = °C + 273.15, and °R = K × 9/5. Rankine is an absolute scale with Fahrenheit-sized degrees. Readings below absolute zero are rejected.
Automatic displays up to 12 significant digits. Choose 2, 4 or 6 decimal places in Precision for a shorter result. Displayed results are rounded; very large or small values use scientific notation.
Common questions
What is the formula for Celsius to Fahrenheit?
Multiply the Celsius temperature by 9/5 (1.8) and add 32. For example, 20 °C is 20 × 1.8 + 32 = 68 °F.
What is a quick way to estimate Fahrenheit from Celsius?
Double the Celsius value and add 30. For 20 °C that gives 70 °F, close to the exact 68 °F. The estimate drifts further from the exact value at high and low temperatures.
At what temperature are Celsius and Fahrenheit equal?
At −40. Both scales read −40 at the same point.