Percentage Calculator
What is X% % of Y?
FAQ
Formulas and explanations on percentage calculations
How do you calculate the percentage of a number?
Multiply the number by the percentage and divide by 100. Example: 20% of 150 = (20 × 150) / 100 = 30. Equivalently: 0.20 × 150 = 30.
How do you calculate percentage change?
Formula: ((Final value - Initial value) / Initial value) × 100. A positive result indicates an increase, negative a decrease. Example: from 80 to 100 → ((100-80)/80) × 100 = +25%.
How do you add a percentage to a number?
Multiply the number by (1 + percentage/100). Example: 200 + 15% = 200 × 1.15 = 230. To subtract: 200 - 15% = 200 × 0.85 = 170.
How do I work out a percentage of a number?
You multiply the number by the percentage and divide by a hundred. Twenty per cent of a hundred and fifty is twenty times a hundred and fifty divided by a hundred, which is thirty.
How do I work out a percentage change?
You subtract the starting value from the final one, divide by the starting value and multiply by a hundred. A positive result is a rise, a negative one is a fall.
How do I add or take off a percentage?
To add, you multiply by one plus the percentage divided by a hundred. To take off, you multiply by one minus the same amount. Adding fifteen per cent to two hundred gives two hundred and thirty.