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The Interactive Thermometer

Drag the slider, or use up and down keys:

images/thermometer-inter.js

Quick Conversion Guide

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

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

Why? Read Temperature Conversion.

Celsius Rhyme
Thirty's hot
Twenty's nice
Ten's cool
Zero's ice
Fahrenheit Rhyme
90 is hot
70 is nice
50 is cool
30 is ice

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Drag the slider to see how Fahrenheit and Celsius are related, with examples.

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

Type a value in either box

Or use the slider

Or the Interactive Thermometer

Or this method:

( Explanation Below ...)

Typical Temperatures

(only bold are exactly the same)

Some Tricks:

Daily Temperatures: these three conversions "flip the digits" (accurate within 1°):

°C °F
28 ⇄ 82
16 ⇄ 61
04 ⇄ 40

Oven Temperatures: in the range 150 to 200 °C we can double °C to get °F (accurate within 8°F):

Going the other way: for the range 300 to 400 °F we can halve °F to get °C (accurate within 4°C).

Explanation

There are two main temperature scales:

°C, the Celsius Scale (part of the Metric System, used in most countries)

°F, the Fahrenheit Scale (used in the US)

They both measure the same thing (temperature!), but use different numbers:

Boiling water (at normal pressure) measures 100° in Celsius, but 212° in Fahrenheit

And as water freezes it measures 0° in Celsius, but 32° in Fahrenheit

Like this:

Looking at the diagram, notice:

The scales start at a different number (0 vs 32), so we will need to add or subtract 32

The scales rise at a different rate (100 vs 180), so we will also need to multiply

And so, to convert:

from Celsius to Fahrenheit: first multiply by , then add 32

from Fahrenheit to Celsius: first subtract 32, then multiply by

Example: Convert 25° Celsius (a nice warm day) to Fahrenheit

Example: Convert 98.6° Fahrenheit (normal body temperature) to Celsius

We can swap the order of divide and multiply if we want, but don't change the add or subtract. So this is also OK:

Example: Convert 98.6° Fahrenheit to Celsius (again)

(Same answer as before, was it easier or harder this way?)

Other Methods That Work

Use 1.8 instead of 9/5

9/5 is equal to 1.8, so we can also use this method:

Celsius to Fahrenheit: °C × 1.8 + 32 = °F
Fahrenheit to Celsius: (°F − 32) / 1.8 = °C

To make "×1.8" easier we can multiply by 2 and subtract 10%, but it only works for °C to °F:

Celsius to Fahrenheit: (°C × 2) less 10% + 32 = °F

Example: Convert 20° Celsius (A nice day) to Fahrenheit

Add 40, Multiply, Subtract 40

Since both scales cross at −40° (−40° C equals −40° F) we can:

add 40,

multiply by 5/9 (for °F to °C), or 9/5 (for °C to °F)

subtract 40

Like this:

Celsius to Fahrenheit: Add 40, multiply by 9/5, then subtract 40
Fahrenheit to Celsius: Add 40, multiply by 5/9, then subtract 40

Example: Convert 10° Celsius (A cool day) to Fahrenheit

Quick, but Not Accurate

Celsius to Fahrenheit: Double, then add 30
Fahrenheit to Celsius: Subtract 30, then halve

Examples °C → °F:

Examples °F → °C:

Footnote: Temperature is a measure of how fast an object's particles are moving.

1041, 1042, 1043, 1044, 3724, 3725, 3726, 3727, 3728, 3729

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