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I have the total I've earned last year which should represent the 100% of the pie.

Then I have my insurance expenses and I want to understand, graphically, how much of my total income went to pay insurance.

I know that a basic proportion like:

total expenses : total insurance costs = 100 : x

is the correct math but I can't find a way to display this in a pie chart.

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... you mean a "pie chart" ? – Sirex Jan 14 '11 at 13:07
up vote 0 down vote accepted

In order to be able to make a pie chart correctly, you need to list the percentage for each item, and the sum of all these percentages must be equal to 1.

For example,

Total insurance cost: 0.2
Expense A: 0.4
Expense B: 0.3
Expense C: 0.1
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You don't need to do the scaling yourself, the pie chart will do it for you – James Jan 14 '11 at 13:17

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