Percentages are everywhere in everyday life. We use them for shopping discounts, taxes, tips, exam scores, business reports, savings, statistics, and many other calculations.
A Percentage Calculator makes these calculations quick and easy without having to work out the formulas manually.
What Is a Percentage?
A percentage represents a number as a fraction of 100.
For more information about percentages and percentage calculations, see the Percentage reference from Wolfram MathWorld.
The symbol used for percentage is:
%
For example:
50% = 50 out of 100 = 0.50
25% = 25 out of 100 = 0.25
10% = 10 out of 100 = 0.10
So if you have 100 items and 25 of them are selected, then 25% of the items are selected.
What Is a Percentage Calculator?
A Percentage Calculator is an online tool that helps you solve common percentage problems.
For example, you may want to know:
What is 20% of 150?
The calculation is:
20 ÷ 100 × 150 = 30
Therefore:
20% of 150 = 30
How to Calculate a Percentage of a Number
Use this formula:
Percentage Value = (Percentage ÷ 100) × Number
Example:
What is 15% of 200?
15 ÷ 100 × 200 = 30
So:
15% of 200 = 30
How to Use the Percentage Calculator
Step 1 — Enter the Percentage
Enter the percentage you want to calculate.
For example:
25%
Step 2 — Enter the Number
Enter the number you want to calculate the percentage of.
For example:
400
Step 3 — Calculate
Click the Calculate button.
Step 4 — View the Result
The calculator instantly gives you the answer:
25% of 400 = 100
Common Percentage Examples
| Calculation | Result |
|---|---|
| 10% of 100 | 10 |
| 20% of 100 | 20 |
| 25% of 200 | 50 |
| 50% of 200 | 100 |
| 10% of 500 | 50 |
| 15% of 1,000 | 150 |
| 20% of 1,000 | 200 |
| 75% of 400 | 300 |
Where Are Percentages Used?
🛍️ Shopping Discounts
If an item costs $100 and has a 20% discount:
20% of $100 = $20
Discounted price:
$100 − $20 = $80
💰 Tips
If your restaurant bill is $50 and you want to leave a 10% tip:
10% of $50 = $5
🎓 Exam Scores
If you answer 80 questions correctly out of 100:
80 ÷ 100 × 100 = 80%
Your score is 80%.
💼 Business & Finance
Percentages are commonly used for profits, losses, interest rates, taxes, sales growth, and financial comparisons.
🏠 Everyday Life
You may also encounter percentages when checking battery levels, weather forecasts, nutrition information, surveys, statistics, and progress toward goals.
Useful Percentage Shortcuts
Some percentages can be calculated mentally.
10% → Divide by 10
10% of 500 = 50
50% → Divide by 2
50% of 500 = 250
25% → Divide by 4
25% of 400 = 100
1% → Divide by 100
1% of 500 = 5
These shortcuts are useful, but a calculator is more convenient for unusual numbers and percentages.
Percentage vs. Percentage Change
These are related but different calculations.
Percentage Calculator → Finds a percentage of a number.
Example:
20% of 500 = 100
Percentage Change Calculator → Measures how much a value has increased or decreased relative to its original value.
Example:
100 → 120 = 20% increase
We already have both types in our LivingToolsGuide calculator collection.
Calculate Percentages Instantly
Percentage calculations don’t need to be complicated.
Whether you’re checking a discount, calculating a tip, reviewing an exam score, or working with financial figures, our Percentage Calculator can give you a quick result.
Use the calculator whenever you need an easy way to solve everyday percentage problems.
Everyday Uses of Percentage Calculations
Percentages are used in many everyday situations, including shopping discounts, sales tax, tips, interest rates, exam scores, business reports, and personal finance. For example, knowing how to calculate 20% off a price can help you quickly estimate how much you will save during a sale. Percentages are also useful when comparing changes in prices, income, expenses, or other values over time. Understanding these basic calculations makes it easier to interpret numbers and make informed everyday decisions.