Free Percentage Calculator
Free Percentage Calculator
Calculate percentages, find what percentage one number is of another, and work out percentage increases or decreases. This free percentage calculator gives quick results for shopping discounts, price changes, schoolwork, budgets, business figures, and everyday calculations.
What Is X% of Y?
Find a percentage of any number.
X Is What Percent of Y?
Compare a part with a total to calculate its percentage.
Percentage Increase or Decrease
Compare an original value with a new value to see the amount and percentage of change.
Change amount: 20
Percentage of a number = (Percentage ÷ 100) × Number
What percent = (Part ÷ Total) × 100
Percentage change = ((New Value − Original Value) ÷ Original Value) × 100
How to Use Free Percentage Calculator
Choose the calculator section that matches the calculation you need. To calculate a percentage of a number, enter the percentage and the number, then click Calculate Percentage. For example, 15% of 200 is 30. This is useful for calculating a discount amount, a tax portion, a tip, or a share of a total.
To find what percentage one value represents, enter the part and the total in the second section, then select Find Percentage. The calculator divides the part by the total and multiplies the result by 100. The total cannot be zero for this calculation. To calculate an increase or decrease, enter the original value and the new value in the third section. The result shows whether the value increased, decreased, or stayed the same, along with the numerical change.
When Are Percentage Calculations Useful?
Percentages help express a value as a portion of 100, making comparisons easier to understand. Shoppers can estimate sale discounts, students can check homework, and businesses can compare revenue or expenses over time. You can also use percentage calculations to understand test scores, survey results, budget allocations, price changes, and progress toward a goal.
Percentage increase and percentage decrease are measured relative to the original value. A change from 80 to 100 is a 25% increase, while a change from 100 to 80 is a 20% decrease. The percentages differ because the starting values are different. This tool performs the arithmetic locally in your browser and does not require an account.
Frequently Asked Questions
How do I calculate a percentage of a number?
Divide the percentage by 100 and multiply it by the number. For example, 20% of 50 is 0.20 × 50 = 10.
How do I find what percentage one number is of another?
Divide the part by the total and multiply by 100. For example, 25 out of 100 is 25%.
How is percentage increase calculated?
Subtract the original value from the new value, divide the difference by the original value, and multiply by 100. A positive result is an increase.
Can I calculate a percentage decrease?
Yes. Enter a new value lower than the original value in the percentage change section. The result will show the percentage decrease and the amount of change.
What happens if the total or original value is zero?
A percentage-of-total calculation cannot divide by a total of zero, and percentage change cannot use an original value of zero. Enter a non-zero value for those calculations.
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