Percentage Calculator
A percentage calculator helps you solve percent problems quickly and accurately.
You can calculate:
- X% of a number
- What percent one number is of another
- Percentage increase
- Percentage decrease
- Percent change
- Reverse percentage
This free online percentage calculator works on mobile, tablet, and desktop. It provides instant and reliable results.
What Is a Percentage?
Percent means “per hundred.”
- 50% means 50 out of 100
Percentages are used in everyday situations such as:
- Shopping discounts
- Salary increases
- Taxes
- Profit margins
- Business growth
- Exam scores
- Investment returns
A percentage calculator simplifies calculations and reduces errors. Math is Fun explains percentage formulas calculations and real-world percentage examples clearly.
1. X% of Y
This finds a portion of a number.
Formula
(X ÷ 100) × Y
Example
Find 45% of 20:
- 45 ÷ 100 = 0.45
- 0.45 × 20 = 9
Final Answer: 9
2. X Is What % of Y
This compares two numbers.
Formula
(X ÷ Y) × 100
Example
What percent is 25 of 35:
- 25 ÷ 35 = 0.714285
- 0.714285 × 100 = 71.4285
Rounded Answer: 71.43%
3. Percentage Increase
This shows how much a value increases.
Formula
(New − Original) ÷ Original × 100
Example
Original value: 90
Increase: 20
- 20 ÷ 90 = 0.2222
- 0.2222 × 100 = 22.22
Final Answer: 22.22% increase
4. Percentage Decrease
This shows how much a value decreases.
Formula
(Original − New) ÷ Original × 100
Example
Original value: 80
Decrease: 20
- 20 ÷ 80 = 0.25
- 0.25 × 100 = 25
Final Answer: 25% decrease
5. Percent Change
This compares an old value with a new value.
Formula
(New − Old) ÷ Old × 100
Example
Old value: 150
New value: 200
- 200 − 150 = 50
- 50 ÷ 150 = 0.3333
- 0.3333 × 100 = 33.33
Final Answer: 33.33% increase
6. Reverse Percentage
This finds the original value before an increase or decrease.
Formula (Increase)
Original = Final ÷ (1 + Percentage ÷ 100)
Example
Final value: 200
Increase: 30%
- 30 ÷ 100 = 0.30
- 1 + 0.30 = 1.30
- 200 ÷ 1.30 = 153.85
Final Answer: 153.85
Formula (Decrease)
Original = Final ÷ (1 − Percentage ÷ 100)
Real-Life Percentage Examples
Shopping Discount
Original price: 150
Discount: 20%
- 20 ÷ 100 = 0.20
- 0.20 × 150 = 30
New price:
- 150 − 30 = 120
Salary Raise
Old salary: 60,000
New salary: 66,000
- 66,000 − 60,000 = 6,000
- 6,000 ÷ 60,000 = 0.10
- 0.10 × 100 = 10%
Exam Score
Correct answers: 36
Total questions: 50
- 36 ÷ 50 = 0.72
- 0.72 × 100 = 72%
The Statistics Calculator is useful for analyzing percentages and numerical data accurately.
Benefits of Using This Percentage Calculator
This calculator is designed to make percentage calculations simple and error-free:
- Fast calculations: Get instant answers without manual steps
- High accuracy: Eliminates common math mistakes
- Multiple formulas in one tool: Covers all percentage scenarios
- Easy to use: Simple input and quick results
- Works on all devices: Mobile, tablet, and desktop friendly
- Time-saving: Ideal for daily, academic, and business use
It turns complex percentage problems into quick and simple calculations. You can also use the Scientific Calculator for advanced mathematical and percentage-related calculations.
Why Use an Online Percentage Calculator?
Manual calculations can be time-consuming and prone to errors.
An online calculator:
- Saves time
- Reduces mistakes
- Provides instant results
- Works anywhere without installation
Understanding percentages is essential for solving many real-world mathematics and data interpretation problems.
How to Use This Percentage Calculator
- Select the calculation type
- Enter your values
- Click Calculate
- View results instantly
- Click Clear to reset
The entire process takes only a few seconds.
Frequently Asked Questions
Is this calculator free?
Yes, it is completely free to use.
Can it calculate increase and decrease?
Yes, both percentage increase and decrease are included.
Does it support reverse percentage?
Yes, it can calculate original values from final amounts.
Is it accurate?
Yes, it uses standard mathematical formulas.
Does it work on mobile?
Yes, it works on phones, tablets, and desktops.
Disclaimer
This percentage calculator provides results based on the values entered. For important financial, academic, or business decisions, always verify calculations independently.