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# Conversion of Temperature

### Quick Fahrenheit (°F) / Celsius (°C) Conversion:

Try the Temperature Conversion Tool or the Interactive Thermometer or this method:

 °F to °C Deduct 32, then multiply by 5, then divide by 9 °C to °F Multiply by 9, then divide by 5, then add 32

Or read on to understand why ...

## Explanation

There are two main temperature scales:

• °F, the Fahrenheit Scale (used in the US), and
• °C, the Celsius Scale (part of the Metric System, used in most other countries)

They both measure the same thing (temperature!), just using different numbers.

• If you freeze water, it measures 0° in Celsius, but 32° in Fahrenheit
• If you boil water, it measures 100° in Celsius, but 212° in Fahrenheit
• The difference between freezing and boiling is 100° in Celsius, but 180° in Fahrenheit.
Freezing ... to ... Boiling   ## Conversion Method

Looking at the diagram, notice:

• The scales start at a different number (32 vs 0), so we will need to add or subtract 32
• The scales rise at a different rate (180 vs 100), so we will also need to multiply

And this is how it works out:

 To convert from Celsius to Fahrenheit, first multiply by 180/100, then add 32 To convert from Fahrenheit to Celsius, first subtract 32, then multiply by 100/180

Note: 180/100 can be simplified to 9/5, and likewise 100/180=5/9.

So, this is the easiest way:
 Celsius to Fahrenheit (°C × 9/5) + 32 = °F Fahrenheit to Celsius (°F - 32) x 5/9 = °C

### Example 1

Convert 26° Celsius (A nice warm day!) to Fahrenheit

First: 26° × 9/5 = 234/5 = 46.8
Then: 46.8 + 32 = 78.8° F

### Example 2

Convert 98.6° Fahrenheit (Normal Body Temperature!) to Celsius

First: 98.6° - 32 = 66.6
Then: 66.6× 5/9 = 333/9 = 37° C

## Typical Temperatures

°C °F Description
100 212 Water boils
40 104 Hot Bath
37 98.6 Body temperature
30 86 Beach weather
21 70 Room temperature
10 50 Cool Day
0 32 Freezing point of water
-18 0 Very Cold Day
-40 -40 Extremely Cold Day (and the same number!)
(bold are exact)

## Conversion Tool

Just type in a value and click in the other box
C: <=> F: