What is a Percentage?
A percentage is a mathematical way to express a number as a part of 100. For example, 25% means 25 out of every 100. Percentages are used in everyday life — from calculating tax and discounts to analyzing statistics and academic scores.
Why Use Our Online Percentage Calculator?
Our percentage calculator saves you time and reduces human error. It supports:
- Finding what percentage one number is of another
- Calculating X% of a given value
- Determining percent increase or decrease
- Quick financial estimations and business calculations
- Instant results with zero downloads or sign-ups
Real-Life Use Cases
Whether you're a student, entrepreneur, data analyst, or simply splitting a bill — understanding percentages is crucial. Use cases include:
- Shopping: Find sale prices and discounts (e.g., 20% off)
- Health: Calculate body fat or sugar intake
- Finance: Understand interest rates and loan percentages
- Academics: Convert scores into percentage formats
How to Calculate a Percentage
1. To calculate X% of Y: Multiply X by Y and divide by 100.
Formula: (X / 100) × Y
2. To calculate what percent X is of Y: Divide X by Y and multiply by 100.
Formula: (X / Y) × 100
3. To calculate percentage increase or decrease: Subtract the old number from the new number, divide by the old number, then multiply by 100.
Formula: ((New - Old) / Old) × 100
Why Our Tool is Better
- 100% Free & Fast
- No registration required
- Supports multiple calculation types
- Mobile and desktop friendly
- Safe and secure - no data stored
FAQ - Frequently Asked Questions
- How do I calculate a percentage of a number?
- Multiply the number by the percentage, then divide by 100.
- What is the formula for percentage change?
- (New - Old) ÷ Old × 100
- What is 15% of 200?
- It’s 30. Use our calculator above to solve similar problems easily.