Temperature calculator
Fahrenheit to Celsius Converter
Convert fahrenheit (f) to celsius (c) with the exact temperature formula, worked examples, and a common-values table.
Exact conversion
Fahrenheit to celsius formula
c = (f × 0.555555556) − 17.7777778
1 f equals -17.2222222 c. 10 f equals -12.2222222 c.
About these units
- f
- Degrees Fahrenheit.
- c
- Degrees Celsius.
Common f to c values
| f | c |
|---|---|
| -40 f | -40 c |
| 0 f | -17.7777778 c |
| 20 f | -6.66666667 c |
| 100 f | 37.7777778 c |
Formula
Fahrenheit to celsius formula
c = (f × 0.555555556) − 17.7777778
1 f equals -17.2222222 c. 10 f equals -12.2222222 c.
FAQs
How do I convert fahrenheit to celsius?+
Use this formula: c = (f × 0.555555556) − 17.7777778. Enter the f value and the calculator applies the relationship immediately.
How many c are in 1 f?+
1 f equals -17.2222222 c.
What is 10 f in c?+
10 f equals -12.2222222 c. The displayed result may be rounded, while the calculator keeps full precision internally.
Can I convert celsius back to fahrenheit?+
Yes. Use Swap in the converter to reverse the units and calculate c to f.
How does the Fahrenheit to Celsius Converter calculate the result?+
It uses the Fahrenheit to celsius formula: c = (f × 0.555555556) − 17.7777778. 1 f equals -17.2222222 c. 10 f equals -12.2222222 c.
What information do I need to use the Fahrenheit to Celsius Converter?+
Convert fahrenheit (f) to celsius (c) with the exact temperature formula, worked examples, and a common-values table.
Temperature guide
How to use the Fahrenheit to Celsius Converter
Convert fahrenheit (f) to celsius (c) with the exact temperature formula, worked examples, and a common-values table. The page also explains the fahrenheit to celsius formula and shows a practical example: 1 f equals -17.2222222 c. 10 f equals -12.2222222 c.
- 1
Enter your details
Enter the source value, then choose the units or values you want to convert.
- 2
Check the calculation
Review the result alongside the fahrenheit to celsius formula: c = (f × 0.555555556) − 17.7777778.
- 3
Compare scenarios
Change one or more inputs to see how they affect the fahrenheit to Celsius Converter result before you use the estimate.
Was this calculator useful?
0/1200