Percentage Calculator
Calculate percentages instantly — find X% of Y, what percent X is of Y, percentage change, and increase/decrease by percentage. Free online percentage calculator.
Five types of percentage calculations
- X% of Y: find a fraction of a number — e.g. 18% GST on ₹1,000 = ₹180.
- X is what % of Y: find a ratio — e.g. you scored 45 out of 60: what % = 75%.
- % change: track growth or decline — e.g. revenue went from ₹80L to ₹1Cr: +25%.
- Increase by %: apply a markup — e.g. add 20% margin to ₹500 cost price = ₹600.
- Decrease by %: apply a discount — e.g. 30% off ₹2,000 = ₹1,400.
Common use cases
Percentage calculators are used everywhere: calculating GST and discounts in retail, tracking investment returns, computing exam scores, finding salary hikes, evaluating business growth, and splitting tips. Knowing how to quickly move between these five modes covers the vast majority of real-world percentage questions.
Frequently asked questions
- How do I calculate X% of Y?
- Multiply Y by X and divide by 100. For example, 15% of 200 = (200 × 15) / 100 = 30. Use the 'X% of Y' mode in this calculator.
- How do I find what percentage X is of Y?
- Divide X by Y and multiply by 100. For example, 30 is what % of 200? = (30 / 200) × 100 = 15%. Use the 'X is what % of Y' mode.
- How do I calculate percentage change?
- Percentage change = (New value − Original value) / |Original value| × 100. A positive result is an increase, negative is a decrease. Example: from 100 to 125 = (125 − 100) / 100 × 100 = +25%.
- How do I increase a number by a percentage?
- Result = Original × (1 + Rate/100). Example: increase ₹500 by 18% = 500 × 1.18 = ₹590. Use the 'Increase by %' mode.