Formulas used
- X% of Y = X ÷ 100 × Y
- A is what % of B = A ÷ B × 100
- % change from A to B = (B − A) ÷ |A| × 100
A percentage increase followed by the same percentage decrease does not bring you back to the start: £100 up 10% is £110, and £110 down 10% is £99.
FAQs
How do I calculate a percentage increase?
Subtract the old value from the new value, divide by the old value and multiply by 100.
What is 15% of 240?
36.