Now the temperature has started to drop. The months of October and November have set records for the highest average temperature over a 24-hour period. The coming weekend reports temperatures down to around the freezing point.

Celsius scale, or centigrade scale, is a temperature scale that is based on the freezing point of water at 0°C and the boiling point of water at 100°C. Fahrenheit scale is a temperature scale that is based on the freezing point of water at 32°F and the boiling point of water at 212°F.

## Fahrenheit to Celsius Estimate Formula

Use this formula to get a good estimate of the Celsius temperature when converting from Fahrenheit. In this case */ *means divided by or to use division.

**(Fahrenheit temp. [F]-30)/2 = Celsius temp.**

In other words, if you’d like to convert a Fahrenheit temperature to an approximate Celsius temperature:

- Start with the temperature in Fahrenheit (e.g., 100 degrees).
- Subtract 30 from this figure (e.g., 100 – 30 = 70).
- Divide your answer by 2 (e.g., 70 / 2 = 35).

## Fahrenheit to Celsius Exact Formula

If you want a more precise calculation, you can use the more exact formula. Using this calculation, we determine that 100 degrees Fahrenheit is equivalent to 37.78 degrees Celsius.

**(F – 32) / 1.8 = C**

In other words, if you’d like to convert a temperature reading in Fahrenheit to Celsius:

- Start with the temperature in Fahrenheit (e.g., 100 degrees).
- Subtract 32 from this figure (e.g., 100 – 32 = 68).
- Divide your answer by 1.8 (e.g., 68 / 1.8 = 37.78)

## Converting Celsius to Fahrenheit

To convert Celsius to Fahrenheit, simply reverse the equation. In this case * means times, or to use multiplication.

**(C * 1.8) + 32 = F**

You can use this equation to show that 100 degrees Celsius is equal to 212 degrees Fahrenheit.

- Start with the temperature in Celsius (e.g., 100 degrees).
- Multiply this figure by 1.8 (e.g., 100 * 1.8 = 180).
- Add 32 to this figure (e.g., 180 + 32 = 212).