Percentage Calculator
Calculate percentages instantly with clear formulas, visual feedback, and copyable answers. Use it for discounts, tax, tips, exam marks, percent increase, reverse percentage, margin, markup, and everyday number comparisons.
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Choose a mode, enter your numbers, and the result updates automatically.
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What Is a Percentage Calculator?
A percentage calculator is a fast way to turn โout of 100โ questions into exact numbers. Percentages appear in school marks, discounts, taxes, interest, tips, reports, business margins, comparison tables, and daily decisions. The basic idea is simple: a percentage expresses a value as a share of 100. For example, 25% means 25 out of 100, which is the same as 0.25 as a decimal.
This CalcMora tool is designed for more than one simple percentage problem. It includes seven modes so you can answer the most common percentage questions without changing tools. You can find the percentage of a number, calculate what percent one value is of another, measure growth or decline, add or remove a percentage, reverse a finished percentage change, compare two values using percentage difference, and check margin or markup for business use.
The result updates in real time and includes a formula explanation, not just the final number. This helps you understand why the result is correct. For example, if a value rises from 80 to 100, the increase is 25%, because the change is 20 and 20 is 25% of the original value 80. If you compare 80 and 100 using percentage difference, the answer is different because the calculation compares the gap with the average of both values.
Percentage Formulas Used
Percent formulas depend on what you are trying to find. The table below summarises the formulas used in the calculator. These formulas are useful for checking homework, comparing prices, calculating business profit, and understanding changes in reports.
| Mode | Formula | Example use |
|---|---|---|
| Percent of a number | (percentage รท 100) ร number | Find 15% tax, 20% discount, or 10% tip |
| What percent? | (part รท whole) ร 100 | Find what percent 30 is of 150 |
| Percent change | ((new โ old) รท old) ร 100 | Measure growth, decline, price change, or score improvement |
| Increase / decrease | number ร (1 ยฑ percentage รท 100) | Add VAT, apply a raise, remove a discount |
| Reverse percentage | final value รท (1 ยฑ percentage รท 100) | Find the original price before tax or discount |
| Percentage difference | |a โ b| รท ((a + b) รท 2) ร 100 | Compare two values without choosing a starting value |
| Margin and markup | profit รท selling price or profit รท cost | Check business pricing and profit percentage |
Worked Examples
Example 1: Find 20% of 150
Convert 20% into a decimal by dividing by 100. That gives 0.20. Then multiply 0.20 by 150. The result is 30. This means 20% of 150 is 30. You can use the same method for tips, discounts, tax, commissions, and partial marks.
Example 2: Increase 80 by 25%
A 25% increase means the new value is 125% of the original value. The multiplier is 1.25. Multiply 80 by 1.25 and the final value is 100. The increase amount is 20. This method is useful for price increases, salary raises, growth rates, and target planning.
Example 3: Reverse a 20% increase
If the final value is 120 after a 20% increase, divide 120 by 1.20. The original value is 100. This is useful when a price already includes tax, service charge, or an increase and you need to find the value before that percentage was applied.
Example 4: Margin vs markup
If an item costs 80 and sells for 100, the profit is 20. Margin compares profit to the selling price, so the margin is 20 รท 100 ร 100 = 20%. Markup compares profit to the cost, so the markup is 20 รท 80 ร 100 = 25%.
How to Use This Percentage Calculator
Select the mode that matches your question. For example, choose โPercent changeโ if you have an old value and a new value.
Enter the numbers in the input fields. The field labels change automatically depending on the selected mode.
Read the result, formula, visual bar, and metric cards. These explain the answer and show related values.
Use the copy, WhatsApp, copy link, save history, or reset buttons depending on what you want to do next.
Frequently Asked Questions
What can this percentage calculator do?
This calculator solves several common percentage problems in one place. You can find a percentage of a number, calculate what percent one value is of another, measure percent change between old and new values, add or subtract a percentage, reverse a percentage change, compare two values using percentage difference, and calculate profit margin and markup. It also shows the formula, extra metrics, and a visual bar so the answer is easier to understand.
How do I calculate a percentage of a number?
To calculate a percentage of a number, divide the percentage by 100 and multiply by the number. For example, 20% of 150 means 20 divided by 100, then multiplied by 150. That gives 30. This is useful for discounts, tax, tips, commission, exam marks, savings targets, and many everyday comparisons where you need to turn a percent into an actual value.
What is the difference between percent change and percentage difference?
Percent change measures movement from an old value to a new value, so the starting value matters. It is commonly used for price increases, salary changes, growth rates, and performance changes. Percentage difference compares two values more neutrally by dividing their gap by their average. It is useful when neither value is the clear starting point, such as comparing two measurements, quotes, or estimates.
How does reverse percentage work?
Reverse percentage finds the original value before a percentage increase or decrease was applied. For example, if a final price is 120 after a 20% increase, the original value is 120 divided by 1.20, which equals 100. For a decrease, the calculator divides by a multiplier below 1, such as 0.80 for a 20% reduction. This is useful when tax, discounts, or price changes are already included.
Can I use this calculator for discounts, tax, and tips?
Yes. For discounts, use the increase/decrease mode with a negative percentage, or use percent of a number to find the discount amount first. For tax or tips, use percent of a number to calculate the added amount, then add it to the original price. The calculator shows the change amount and final value, which makes it helpful for shopping, invoices, restaurant bills, service charges, and quick budget checks.
Are margin and markup the same thing?
No. Margin and markup both use profit, but they compare profit to different bases. Profit margin compares profit with the selling price, while markup compares profit with the cost. If something costs 80 and sells for 100, the profit is 20. The margin is 20% because 20 is 20% of the selling price. The markup is 25% because 20 is 25% of the cost.