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# TEMPERATURE CONVERSION

General information on temperature

Fahrenheit:  Under standard conditions water boils at 212 deg. and freezes at 32 deg.

Celsius or Centigrade:   Water boils at 100 deg. and freezes as 0 deg.

Kelvin:  Water boils at 373.15 K and freezes at 273.15 K.

-40 degrees Celsius is the same as -40 degrees Fahrenheit *

* Thanks to Chris Johnson for pointing this out.

How to convert from Celsius to Fahrenheit and vice versa

To convert Celsius into Fahrenheit

Multiply by 9, divide by 5 and add 32.

To convert Fahrenheit into Celsius

Subtract 32, multiply by 5 and divide by 9

Neal Bellard has kindly sent in an even easier way to convert these -

Why use 3 steps to convert degrees C to F and vice versa?

For Celsius to Fahrenheit

Multiply by 1.8 then add 32.

For Fahrenheit to Celsius

Subtract 32 then divide by 1.8.

This is the easiest and quickest way of all to convert Centigrade to Fahrenheit. This method gives you more or less the correct answer.

For Celsius/Centrigrade to Fahrenheit -  Just double it and add 30!

Example

Double it = 30

Add 30 = 60 deg.  Fahrenheit

For Fahrenheit to Celsius

Just take away 30 and then half it.

Ella Terrence

Thought I might just mention a way that I have used for many years and found accurate.

For Centigrade/Celsius to Fahrenheit conversion -

- then minus 10%

- then add 32

- easy!

Example

40 deg Centigrade/Celsius  x 2 = 80

then - 10% = 72

then plus 32 = 104 Fahrenheit

This was learned at school back in the early 70's and works well for C to F conversions.

Fahrenheit to Centigrade conversion a bit more fiddling around - done in reverse to nearest round figures.

Mrs Johanne Norman

QUICK REFERENCE TABLE

Conversion table Celsius - Fahrenheit

 CELSIUS/CENTIGRADE FAHRENHEIT -40 deg. -40 deg. Thanks Chris Johnson -17.8 deg. 0 deg. - 10 deg. 14 deg. 0 deg. 32 deg. 5 deg. 41 deg. 10 deg 50 deg. 15 deg. 59 deg. 20 deg. 68 deg. 25 deg. 77 deg. 30 deg. 86 deg. 35 deg. 95 deg. 40 deg. 104 deg. 50 deg. 122 deg. 60 deg. 140 deg. 70 deg. 158 deg. 80 deg. 176 deg. 90 deg. 194 deg. 100 deg. 212 deg.

Tip from W Cristo, Jr., M..D

An easy way to remember F vs C for travel and practical purposes:

 Celsius Fahrenheit 0 32 freezing 10 50 chilly 20 68 average temp, so so 30 86 too hot

A nameless contributor sent in the following as an easy way of remembering and couple of the temperatures.

16C is about 61F

28C is about 82F

(The figures are transposed)