Percentage Calculator
Solve everyday percentage problems: discounts, VAT, tips, growth and percentage change.
Percentage Calculator
How to use the Percentage Calculator
- Choose the type of percentage problem.
- Enter the two numbers.
- Press "Calculate" to see the answer and the working.
About this tool
Percentages come up in shopping discounts, taxes such as VAT, salary changes, interest and business growth. This calculator handles the five most common problems so you do not have to remember the formulas.
Percentage change is calculated as (new value minus old value) divided by the old value, times 100. To add VAT of 5%, choose "Add X% to Y" and enter 5 and the price. To find a sale price after a 20% discount, choose "Subtract X% from Y".
Frequently asked questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 15% of 200 is 200 x 15 / 100 = 30.
How do I calculate percentage increase?
Subtract the old value from the new value, divide by the old value and multiply by 100.
How do I add 5% VAT to a price?
Choose "Add X% to Y", enter 5 as X and the price as Y.