Question 1

How do I calculate a percentage of a number?

Accepted Answer

Multiply the number by the percentage and divide by 100. For example, 15% of 200 = 200 × 15 / 100 = 30.

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, 30 is what percent of 200? 30 / 200 × 100 = 15%.

Question 3

How do I calculate a percentage increase?

Accepted Answer

Percentage increase = ((New Value - Old Value) / Old Value) × 100. For example, from £80 to £100 is a 25% increase.

Question 4

How do I add a percentage to a number?

Accepted Answer

New Value = Original Value × (1 + Percentage / 100). To add 20% to £50: £50 × 1.20 = £60.

PERCENTCALCULATOR