Percentage calculator for every situation
Percentages are everywhere — exam marks, salary hikes, shop discounts, GST, interest rates and stock market moves. This percentage calculator puts six of the most common calculations on one page. Just type into any box and the answer updates instantly, with the working shown so you can learn the method too.
How to use it
- Percentage of a number: find a discount, tip or tax amount (e.g. 18% GST on ₹2,450).
- What percent is X of Y: see what share one number is of another.
- Percentage change: compare an old and new price, salary or score.
- Increase/decrease by %: apply a hike or a discount to a number.
- Marks and CGPA: convert exam scores into a percentage.
Percentage formulas
X% of Y = Y × X ÷ 100
X as a % of Y = X ÷ Y × 100
% change = (New − Old) ÷ Old × 100
Y increased by X% = Y × (1 + X ÷ 100)
Examples
- A ₹1,200 shirt with a 15% discount costs 1,200 × 0.85 = ₹1,020.
- A salary rising from ₹40,000 to ₹46,000 is a (6,000 ÷ 40,000) × 100 = 15% hike.
- Scoring 437 out of 500 is 87.4%.
Quick mental tricks
- 10% — move the decimal one place left (10% of 2,450 = 245).
- 5% — half of 10%. 1% — move the decimal two places.
- X% of Y = Y% of X — 8% of 50 is the same as 50% of 8, which is 4.
For returns that grow over many years, use the compound interest calculator.