Percentage Calculator

What is a Percentage?

A percentage is a way of expressing a number as a fraction of 100. The word comes from the Latin "per centum" meaning "by the hundred." Percentages are one of the most universally used mathematical concepts in daily life — from calculating discounts while shopping, to understanding interest rates on loans, to interpreting test scores and statistics. Despite being simple in concept, many people reach for a calculator when dealing with percentages, and the CalcSphere percentage calculator makes any such calculation instant and error-free. **Percentage Off Calculator:** To find the price after a percentage off, subtract the discount from 100% then multiply. For example, 20% off £50: (100−20)% × 50 = £40. **Percentage Increase Calculator:** New value = Original × (1 + percentage/100). Example: 10% increase on 200 = 200 × 1.10 = 220. **Percentage Difference Calculator:** The percentage difference between two values A and B is: |A−B| / ((A+B)/2) × 100. This is different from percentage change which uses the original as base. **Common Percentage Calculations:** What is 10% of 100? → 10 What is 20% of 50? → 10 What is 15% of 200? → 30 What is 25% of 80? → 20 What is 5% of 1000? → 50

How to Use This Calculator

Enter the percentage value and the number you want to find the percentage of. For example, to find 15% of 200, enter 15 in the Percentage field and 200 in the Number field. Click Calculate to get 30. The calculator also shows the decimal equivalent, the remaining amount (100% minus the result), and the inverse — what percentage the result is of the original number. This covers all common percentage use cases in one simple tool.

💡 Pro Tips

• ✓To find what percentage A is of B: divide A by B and multiply by 100.
• ✓To increase a number by X%: multiply by (1 + X/100). To decrease: multiply by (1 − X/100).
• ✓Percentages are not additive — a 50% increase followed by a 50% decrease does not return to the original value.
• ✓In finance, always distinguish between percentage points and percentages — a rate going from 10% to 12% is a 2 percentage point increase but a 20% relative increase.
• ✓Use the percentage change calculator (also on CalcSphere) when comparing two values over time.

Who Uses This Calculator?

Shoppers calculate discounted prices. Students find their exam percentage. Business owners calculate profit margins and tax amounts. Investors compare portfolio returns. Teachers calculate grade percentages. Accountants compute VAT and sales tax. HR professionals calculate salary increments. Nutritionists calculate daily value percentages. The percentage calculator is one of the most versatile tools on CalcSphere.

Frequently Asked Questions