Fahrenheit to Celsius●
Degrees Fahrenheit in. Degrees Celsius 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
°C = (°F − 32) × 5/9
Subtract 32 from the Fahrenheit temperature, then multiply by 5/9. The scales meet at −40, where −40 °F equals −40 °C.
A worked example
For 72 °F, subtract 32 to get 40, then multiply by 5/9. The result is approximately 22.222222 °C.
(72 − 32) × 5/9 ≈ 22.222222 °C
Quick reference
Reference values are rounded to 6 decimal places. Use the converter above for other values or precision.
| Fahrenheit (°F) | Celsius (°C) |
|---|---|
| -40 | -40 |
| 0 | -17.777778 |
| 32 | 0 |
| 50 | 10 |
| 68 | 20 |
| 72 | 22.222222 |
| 86 | 30 |
| 98.6 | 37 |
| 212 | 100 |
All equivalent units
The same value, in every supported unit.
Temperature conversions
For weather, ovens and body temperature.
Use this conversion for US weather forecasts, oven temperatures and thermometers marked in Fahrenheit. Water freezes at 32 °F (0 °C) and boils at 212 °F (100 °C) 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 °F is a change of about 0.556 °C.
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 Fahrenheit to Celsius?
Subtract 32 from the Fahrenheit temperature and multiply by 5/9. For example, 68 °F is (68 − 32) × 5/9 = 20 °C.
What is a quick way to estimate Celsius from Fahrenheit?
Subtract 30 and halve the result. For 70 °F that gives 20 °C, close to the exact 21.1 °C. The estimate drifts further from the exact value at high and low temperatures.
What is normal body temperature in Celsius?
98.6 °F is 37 °C. A temperature of 100.4 °F, or 38 °C, is commonly treated as a fever.