# Fahrenheit to Celsius

## Fahrenheit to Celsius FAQ

### 1. What is the formula to convert Fahrenheit to Celsius?

To convert a temperature from Fahrenheit to Celsius, use the following formula: $$ C = \frac{5}{9} (F - 32) $$ where ( C ) is the temperature in Celsius and ( F ) is the temperature in Fahrenheit.

### 2. How do you convert 100 degrees Fahrenheit to Celsius?

Using the formula: $$ C = \frac{5}{9} (100 - 32) $$ First, subtract 32 from 100, which gives 68. Then multiply 68 by (\frac{5}{9}): $$ C = \frac{5}{9} \times 68 \approx 37.78 $$ So, 100 degrees Fahrenheit is approximately 37.78 degrees Celsius.

### 3. What is 0 degrees Fahrenheit in Celsius?

Using the formula: $$ C = \frac{5}{9} (0 - 32) $$ Subtract 32 from 0, which gives -32. Then multiply -32 by (\frac{5}{9}): $$ C = \frac{5}{9} \times (-32) \approx -17.78 $$ So, 0 degrees Fahrenheit is approximately -17.78 degrees Celsius.

### 4. If the temperature is 32 degrees Fahrenheit, what is it in Celsius?

Using the formula: $$ C = \frac{5}{9} (32 - 32) $$ Since 32 minus 32 is 0: $$ C = \frac{5}{9} \times 0 = 0 $$ So, 32 degrees Fahrenheit is exactly 0 degrees Celsius.

### 5. How can you quickly estimate Fahrenheit to Celsius without exact calculations?

A quick estimation method is to subtract 30 from the Fahrenheit value and then halve the result. This is a rough approximation but can be useful for quick conversions.

For example, to convert 70 degrees Fahrenheit: $$ 70 - 30 = 40 $$ $$ \frac{40}{2} = 20 $$ So, 70 degrees Fahrenheit is approximately 20 degrees Celsius (the exact value is 21.11 degrees Celsius).

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