Degrees Fahrenheit to Degrees Celsius Converter
Convert degrees Fahrenheit to degrees Celsius instantly with this free degrees Fahrenheit to degrees Celsius converter. Enter any value to get an accurate temperature conversion, plus the formula, the conversion factor and a full reference table.
What is 1 degree Fahrenheit in degrees Celsius?
1 degree Fahrenheit is equal to -17.2222222 degrees Celsius.
1°F → -17.2222222°C using °C = (°F − 32) × 5/9
1 degree Fahrenheit = -17.22222222 degrees Celsius
Degrees Fahrenheit to Degrees Celsius formula
°C = (°F − 32) × 5/9
Temperature scales use an offset as well as a ratio, so degrees Fahrenheit and degrees Celsius cannot be converted by multiplication alone.
Worked examples
- -20 degrees Fahrenheit = -28.8888889 degrees Celsius — -20°F → -28.8888889°C using °C = (°F − 32) × 5/9
- 10 degrees Fahrenheit = -12.2222222 degrees Celsius — 10°F → -12.2222222°C using °C = (°F − 32) × 5/9
- 30 degrees Fahrenheit = -1.11111111 degrees Celsius — 30°F → -1.11111111°C using °C = (°F − 32) × 5/9
Degrees Fahrenheit to Degrees Celsius conversion table
Every value below is calculated with the exact conversion factor and rounded for display.
| Degrees Fahrenheit (°F) | Degrees Celsius (°C) |
|---|---|
| -40 °F | -40 °C |
| -20 °F | -28.888889 °C |
| -10 °F | -23.333333 °C |
| 0 °F | -17.777778 °C |
| 5 °F | -15 °C |
| 10 °F | -12.222222 °C |
| 15 °F | -9.4444444 °C |
| 20 °F | -6.6666667 °C |
| 25 °F | -3.8888889 °C |
| 30 °F | -1.1111111 °C |
| 35 °F | 1.6666667 °C |
| 37 °F | 2.7777778 °C |
| 40 °F | 4.4444444 °C |
| 50 °F | 10 °C |
| 75 °F | 23.888889 °C |
| 100 °F | 37.777778 °C |
When you need to convert degrees Fahrenheit to degrees Celsius
- Setting an oven from a recipe written in the other scale.
- Reading a weather forecast while travelling.
- Interpreting a thermostat, fever reading or industrial spec sheet.
Getting a feel for the scale
A converted number is easier to trust when you can picture it. These reference points let you sanity-check the result at a glance.
Degree Fahrenheit (°F)
- Water freezes at 32 °F and boils at 212 °F
- Room temperature is about 70 °F
Degree Celsius (°C)
- Water freezes at 0 °C and boils at 100 °C
- Room temperature is about 21 °C
Mental shortcut
Subtract 30 and halve it. 70 °F → 20 °C (exact answer 21.1 °C).
Common mistakes to avoid
- Multiplying without applying the offset. Temperature scales do not share a zero point, so a plain conversion factor gives the wrong answer.
- Converting a temperature difference the same way as a temperature. A change of 10 °C is a change of 18 °F, not 50 °F.
- Rounding too early. Convert first at full precision, then round the final answer to the precision the task actually needs.
How precise does the answer need to be?
For weather and cooking, one decimal place is more than enough. Clinical and laboratory readings normally need 0.1° resolution, and scientific work should carry the full value through the calculation before rounding.
How these units are defined
- Degree Fahrenheit (°F): The everyday US temperature scale: water freezes at 32 °F, boils at 212 °F. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.
- Degree Celsius (°C): Water freezes at 0 °C and boils at 100 °C at sea level. This unit's relationship to the SI base unit is exact by definition, so no rounding enters the conversion factor.
Related conversions
Frequently asked questions
- What is 1 degree Fahrenheit in degrees Celsius?
- 1 degree Fahrenheit is equal to -17.2222222 degrees Celsius.
- How many degrees Fahrenheit are in one degree Celsius?
- There are 33.8 degrees Fahrenheit in 1 degree Celsius.
- How do you convert degrees Fahrenheit to degrees Celsius?
- Use the formula °C = (°F − 32) × 5/9.
- What is 10 degrees Fahrenheit in degrees Celsius?
- 10 degrees Fahrenheit is -12.2222222 degrees Celsius. 10°F → -12.2222222°C using °C = (°F − 32) × 5/9.