➗ Percentage Calculator
Four calculations on one screen. Fill in the boxes and results appear instantly.
X% of a number
% ×
A is what % of B?
/
Percentage change
→
Price after discount or increase
Use a minus sign for a discount (−15).
What next?
Formulas
- X% of a number: number × X ÷ 100
- A as a percent of B: A ÷ B × 100
- Change: (new − old) ÷ old × 100
- Discounted price: price × (1 − discount ÷ 100)
Successive percentages do not add up: +20% then −20% takes 100 to 96, not back to 100.
Frequently asked questions
How do I calculate a pay rise percentage?
(New salary − old salary) ÷ old salary × 100.
How do I take 15% off?
Multiply the price by 0.85.