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How to Convert a Percentage to a Decimal (Mathematics Lesson)

Converting a Percentage to a Decimal

A percentage can be converted to a decimal.

How to Convert a Percentage to a Decimal

Converting a percentage to a decimal is easy. Divide the percentage by 100.


An Example Question

What is 20% as a decimal?
Step 1
Divide the percentage (20) by 100.
20 ÷ 100 = 0.2
Note: Do not write the % (percent) sign after the decimal.

20% converted to a decimal is 0.2

A Real Example of How to Convert a Percentage to a Decimal

The slider below gives another example of converting a percentage to a decimal.

Interactive Test
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Here's a second test on converting a percentage to a decimal.
Here's a third test on converting a percentage to a decimal.
Top Tip

Short Cut

Converting a percentage to a decimal happens by dividing the percentage by. Dividing by 100 is equivalent to moving the decimal point 2 places to the left:



With practice, it should become easy to visualise this and write the answer down immediately:

1%    →    0.01

9%    →    0.09

36%    →    0.36

72%    →    0.72

100%  →    1.00