Question 1

How do I calculate a percentage of a number?

Accepted Answer

To find X% of Y, multiply Y by X/100. For example, 15% of 200 = 200 x 0.15 = 30.

Question 2

How do I calculate what percentage one number is of another?

Accepted Answer

To find what percent X is of Y, divide X by Y and multiply by 100. For example, 30 is what % of 200? Answer: (30/200) x 100 = 15%.

Question 3

How do I calculate percentage change?

Accepted Answer

Percentage change = ((New - Old) / |Old|) x 100. If the result is positive, it is an increase. If negative, it is a decrease. For example, from 200 to 250: ((250-200)/200) x 100 = 25% increase.

Question 4

What is the difference between percentage and percentage points?

Accepted Answer

A percentage is a proportion out of 100. Percentage points measure the arithmetic difference between two percentages. For example, going from 10% to 15% is a 5 percentage point increase, but a 50% relative increase.

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