Learn how to calculate percentage quickly using a simple formula. This step-by-step guide includes real examples for marks, increase, and decrease.
If you are wondering how to calculate percentage, this guide helps you quickly use the formula for marks, discounts, increase, and decrease without confusion.
To calculate percentage, use this formula:
For example, if you score 72 marks out of 90:
(72 ÷ 90) × 100 = 80%
This means you scored 80%.
What is Percentage?
The word percentage means “per hundred”. It is used to express a number as a fraction of 100.
- 50% means 50 out of 100
- 25% means 25 out of 100
- 100% means the whole value
Percentages make it easy to compare values.
Percentage Calculation Formula
The standard formula to calculate percentage is:
- Part = value you want to convert
- Total = overall value
Example 1: Calculate Percentage from Marks
A student scored 72 marks out of 90:
(72 ÷ 90) × 100 = 80%
Example 2: Find Percentage of a Number
Find 20% of 500:
(20 ÷ 100) × 500 = 100
Example 3: Shopping Discount
If a product costs ₹2000 and discount is 15%:
Discount = (15 ÷ 100) × 2000 = ₹300
Final price = ₹1700
How to Calculate Percentage Increase
Formula:
Example: ₹500 → ₹650 → Increase = 30%
How to Calculate Percentage Decrease (Easy Method)
If you are wondering how to percentage decrease, this method helps you calculate it easily step by step.
Formula:
Example: ₹800 → ₹600 → Decrease = 25%
Percentage Loss Formula
Percentage loss is calculated when the selling price is lower than the cost price.
Real-Life Uses of Percentage
- Shopping discounts
- Exam results
- Profit and loss
- Bank interest
- Data comparison
Quick Tricks to Calculate Percentage Faster
- 10% = divide by 10
- 50% = half
- 25% = divide by 4
- 75% = 50% + 25%
Common Mistakes to Avoid
- Using wrong total value
- Forgetting × 100
- Confusing increase and decrease
Use Our Percentage Calculator
To make calculations faster, use our calculator available on this page.