worldofcalcsPercentage Calculator
About Percentage Calculator
Quickly solve common percentage problems for discounts, taxes, profits, grades, and financial planning. Choose the calculation type, enter your numbers, and see instant results.
Features
- Multiple calculation types: X% of Y, X is what % of Y, and % change.
- Instant results that update as you type.
- Color-coded % change: green for increase, red for decrease.
- Clean, simple interface for fast inputs.
Common Uses
- Calculating discounts and sales prices.
- Tax calculations (GST Calculator).
- Loan interest (Loan EMI Calculator 💰).
- Business metrics and growth rates.
- Academic grade calculations.
- Financial planning and analysis.
How to Use
- Choose the type of percentage calculation.
- Enter your values in the input fields.
- View results instantly; use Reset to start a new calculation.
Ideal for students, professionals, and anyone needing accurate percentage calculations in seconds.
What is a percentage?
A percentage is a number out of 100, so 18% means 18 out of every 100. Percentages let you compare amounts of different sizes: a discount, a tax rate, an exam score, a salary hike or an interest rate. Most everyday questions are one of three kinds: what is X% of a number, what percentage one number is of another, and by what percentage something went up or down.
Percentage formulas
X% of Y = X ÷ 100 × Y. What percent X is of Y = X ÷ Y × 100. Percentage change = (New − Old) ÷ Old × 100; a negative result is a decrease. To remove a percentage that has already been added (such as GST), divide by (1 + rate ÷ 100).
Common percentage mistakes
- Percentage changes don't add up: +20% then −20% leaves you at 96% of the start, not 100%.
- A fall needs a bigger rise to recover: after a 50% fall, you need a 100% rise to get back to where you were.
- Percent and percentage points are different. An interest rate going from 8% to 9% is a rise of 1 percentage point, but of 12.5%.
- To find the price before tax or discount, divide; don't subtract the percentage. 18% off ₹1,180 is not the pre-GST price.
- Successive discounts multiply: 20% off and then a further 10% off is 28% off in total, not 30%.
- A percentage of a percentage is small: 10% of 10% is 1%.
Worked examples
- 15% of 800 = 15 ÷ 100 × 800 = 120
- 60 is what percent of 240? 60 ÷ 240 × 100 = 25%
- Salary from ₹50,000 to ₹55,000: (55,000 − 50,000) ÷ 50,000 × 100 = a 10% hike
- Price of ₹1,180 including 18% GST: ₹1,180 ÷ 1.18 = ₹1,000 before GST
- A price that rises 20% and then falls 20% ends 4% lower, because the fall is taken from the higher price
Quick reference
Common percentages of round amounts.
| Percentage | of ₹1,000 | of ₹10,000 | of ₹1,00,000 |
|---|---|---|---|
| 5% | ₹50 | ₹500 | ₹5,000 |
| 10% | ₹100 | ₹1,000 | ₹10,000 |
| 12% | ₹120 | ₹1,200 | ₹12,000 |
| 15% | ₹150 | ₹1,500 | ₹15,000 |
| 18% | ₹180 | ₹1,800 | ₹18,000 |
| 20% | ₹200 | ₹2,000 | ₹20,000 |
| 25% | ₹250 | ₹2,500 | ₹25,000 |
| 50% | ₹500 | ₹5,000 | ₹50,000 |
Use the calculator above for any other amount.