Percentage Calculator
Use this percentage calculator to find a percentage of a number, compare two values, and calculate percentage increase or decrease in seconds without manual formulas.
Percentage Calculator
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About This Percentage Calculator
This percentage calculator solves the most common percentage questions from one place. Choose the calculation type, enter the known values, and review the result instantly.
The tool works as a percent calculator for school marks, discounts, taxes, tips, business growth, salary changes, statistics, and everyday number checks. Its clear input fields make each percentage calculation easier to set up, while the built-in percentage finder helps you avoid rearranging formulas manually.
How to Use the Percentage Calculator
- Select the type of problem you want to solve.
- Enter the percentage, part, total, original value, or new value.
- Click Calculate.
- Review the answer, the working steps, and the formula used.
- Reset the fields to solve another problem.
Use the first mode when you know the percent and total, the second when you need to compare a part with a whole, and the third when you need an increase or decrease result.
What Is a Percentage?
A percentage represents a value out of 100. The symbol % means “per hundred,” so 25% means 25 out of every 100.
Percentages make it easier to compare values with different totals. They are commonly used for grades, discounts, taxes, interest rates, surveys, sales reports, and financial changes.
How to Calculate Percentage
The basic formula is:
Percentage = Part ÷ Whole × 100
To calculate percentage, divide the part by the total and multiply the result by 100.
Example: if a student scores 45 out of 60:
45 ÷ 60 × 100 = 75%
This means the student earned 75% of the available marks.
How to Find the Percentage of a Number
Use this formula:
Percentage Value = Percentage ÷ 100 × Number
For example, what is 15% of 200?
15 ÷ 100 × 200 = 30
So, 15% of 200 is 30. This method is useful for discounts, commissions, taxes, tips, and mark calculations.
How to Find What Percent One Number Is of Another
Use this formula:
Percent = Part ÷ Total × 100
For example, what percent is 40 of 160?
40 ÷ 160 × 100 = 25%
So, 40 is 25% of 160. This is a common way to find percentage when comparing a smaller value with a total.
Percentage Increase and Decrease
To measure how much a value has changed, use:
Percentage Change = (New Value − Original Value) ÷ Original Value × 100
A positive answer shows an increase, while a negative answer shows a decrease.
A price rises from 80 to 100:
(100 − 80) ÷ 80 × 100 = 25%. The price increased by 25%.
A price falls from 100 to 75:
(75 − 100) ÷ 100 × 100 = -25%. The price decreased by 25%.
Percentage Calculation Examples
| Question | Formula | Result |
|---|---|---|
| What is 20% of 150? | 20 ÷ 100 × 150 | 30 |
| 30 is what percent of 150? | 30 ÷ 150 × 100 | 20% |
| Increase from 80 to 100 | 20 ÷ 80 × 100 | 25% increase |
| Decrease from 100 to 75 | -25 ÷ 100 × 100 | 25% decrease |
These examples show how the same percent calculator can solve different question types by changing the known values and formula.
Where Are Percentages Used?
You can use percentages for:
- School marks and course grades
- Shopping discounts and sale prices
- Tips, taxes, and service charges
- Salary increases and decreases
- Profit, loss, and business growth
- Loan and interest comparisons
- Survey and election results
- Statistics and performance reports
A percentage finder is especially helpful when the numbers are uneven, include decimals, or need to be checked quickly.
Start Calculating
Enter your values above and use the percentage calculator to solve the problem. Check the selected mode and inputs before using the result for school, shopping, finance, or business decisions.
Questions fréquentes
What does this tool calculate?
This percent calculator can find a percent of a number, determine what percent one value is of another, and measure percentage increase or decrease.
How do I calculate a percentage manually?
Divide the part by the whole and multiply by 100. If you are learning how to find percentage, first identify which value is the part and which is the total.
Can a percentage be greater than 100?
Yes. A percentage can be above 100 when a value is greater than the original total or reference value.
Can I use decimal values?
Yes. Every field accepts decimals.
What is the difference between percentage change and percentage difference?
Percentage change compares a new value with an original value. Percentage difference compares two values without treating either one as the starting value.