Question 1

How do I calculate a percentage of a number?

Accepted Answer

To calculate a percentage of a number, multiply the number by the percentage and divide by 100. For example, 25% of 200 is (25 x 200) / 100 = 50.

Question 2

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

Accepted Answer

Divide the part by the whole and multiply by 100. For example, to find what percentage 50 is of 200: (50 / 200) x 100 = 25%.

Question 3

How do I calculate percentage change?

Accepted Answer

Subtract the old value from the new value, divide by the absolute value of the old value, and multiply by 100. A positive result means an increase, while a negative result means a decrease.

Calculatrice de Pourcentage