Degrees Fahrenheit to Degrees Celsius
1 degree Fahrenheit = -17.222 degrees Celsius · 1 °C = 33.8 °F
1 degree Fahrenheit = -17.222 degrees Celsius
How it’s calculated
°C = (°F − 32) × 5/9
- Temperature scales have different zero points, so the conversion adds or subtracts an offset as well as scaling.
- 1 °F = -17.22222222 °C · 1 °C = 33.8 °F
Show worked solutionFactor, unit cancellation and rounding, step by step
Use the exact scale definitions
Temperature scales have different zero points, so this is not a single multiplication: it adds or subtracts an offset as well as scaling. The definitions are exact (0 °C = 273.15 K; 1 °F = 5/9 K; absolute zero = −459.67 °F). Source: NIST SP 811 / Handbook 44; BIPM SI Brochure (9th ed.).
Step 1: subtract the offset
Subtract 32 to remove the Fahrenheit offset.
Step 2: scale
Scale by 5/9.
Round the answer
Rounded to 5 significant figures.
Answer: -17.222 °C · Temperature readings include an offset; for a temperature difference use only the scale factor.
1 °F in other units
Batch convert °F → °C
- 1 °F = -17.222 °C
- 5 °F = -15 °C
- 10 °F = -12.222 °C
- 25 °F = -3.8889 °C
Quick examples
- 1 degree Fahrenheit = -17.222 degrees Celsius
- 5 degrees Fahrenheit = -15 degrees Celsius
- 10 degrees Fahrenheit = -12.222 degrees Celsius
- 25 degrees Fahrenheit = -3.8889 degrees Celsius
- 100 degrees Fahrenheit = 37.778 degrees Celsius
About these units
Degree Fahrenheit (°F)
US customary
T(°F) = T(°C) × 9/5 + 32.
Source: NIST SP 811 / Handbook 44
Degree Celsius (°C)
SI (metric)
T(°C) = T(K) − 273.15.
Source: BIPM SI Brochure (9th ed.)
Degrees Fahrenheit to degrees Celsius conversion table
| Degrees Fahrenheit (°F) | Degrees Celsius (°C) |
|---|---|
| -40 °F | −40 °C |
| -20 °F | −28.889 °C |
| -10 °F | −23.333 °C |
| 0 °F | −17.778 °C |
| 5 °F | −15 °C |
| 10 °F | −12.222 °C |
| 15 °F | −9.4444 °C |
| 20 °F | −6.6667 °C |
| 25 °F | −3.8889 °C |
| 30 °F | −1.1111 °C |
| 35 °F | 1.6667 °C |
| 37 °F | 2.7778 °C |
| 40 °F | 4.4444 °C |
| 50 °F | 10 °C |
| 60 °F | 15.556 °C |
| 80 °F | 26.667 °C |
| 100 °F | 37.778 °C |
| 150 °F | 65.556 °C |
| 180 °F | 82.222 °C |
| 200 °F | 93.333 °C |
Related conversions
Frequently asked questions
How do I convert degrees Fahrenheit to degrees Celsius?
Use °C = (°F − 32) × 5/9. Temperature scales have different zero points, so the conversion adds or subtracts an offset as well as scaling.
How many degrees Celsius are in 1 degree Fahrenheit?
1 degree Fahrenheit (°F) equals -17.222 degrees Celsius (°C); more precisely -17.22222222.
How many degrees Fahrenheit are in 1 degree Celsius?
1 degree Celsius (°C) equals 33.8 degrees Fahrenheit (°F).
What is 10 °F in °C?
10 degrees Fahrenheit = -12.222 degrees Celsius.
Is the degree Fahrenheit a US or a UK unit?
This converter uses the US customary degree Fahrenheit. T(°F) = T(°C) × 9/5 + 32. US and UK units with the same name can differ, so check which one your source uses.
What is a degree Fahrenheit?
T(°F) = T(°C) × 9/5 + 32.
What is a degree Celsius?
T(°C) = T(K) − 273.15.
Formula: °C = (°F − 32) × 5/9. Factors last reviewed 2026-10-27.