Percentage Calculator
Find a percentage of a number, reverse a percentage, or measure percentage increase and decrease.
How this is calculated
X% of Y is (X ÷ 100) × Y. “X is what % of Y” is (X ÷ Y) × 100. Change is ((new − original) ÷ original) × 100.
Worked examples
What is 18% of ₹2,000?
- 18% of 2,000 = 18 ÷ 100 × 2,000
₹360
425 marks out of 500
- 425 ÷ 500 × 100
85%
Increase from 800 to 1,000
- (1,000 − 800) ÷ 800 × 100
25%
20% discount on ₹1,500
- Discount = 20% of 1,500
- Pay ₹1,200
₹300 off
Useful for
- Marks out of a total
- GST-style add-on
- Discount off an MRP
- Increase or decrease vs last year
Questions
How do I calculate a percentage?
To find X% of Y, multiply Y by X and divide by 100. Reverse: X is what percent of Y? Divide X by Y and multiply by 100.
How do I calculate marks percentage?
Marks obtained ÷ maximum marks × 100. Example: 425 ÷ 500 × 100 = 85%.
How do I calculate percentage increase?
(New − old) ÷ old × 100. A fall uses the same formula and comes out negative.
How do I calculate percentage decrease?
(Old − new) ÷ old × 100, or use the increase formula and read the minus sign.
How do I calculate a discount?
Discount amount = rate × original price. Final price = original − discount.