Percentage Calculator
Quickly calculate percentages, increases, decreases, and percentage differences.
How to Use the Percentage Calculator
This Percentage Calculator helps you solve common percentage problems in seconds. Enter your values into the correct calculator box, tap Calculate, and instantly get your answer. You can also use the Copy button to save your result.
Percentage Formula Examples
1) Find X% of Y
Use this formula: (Percentage × Number) ÷ 100. Example: 20% of 500 = 100.
2) Find What Percent One Number Is of Another
Use this formula: (First Number ÷ Second Number) × 100. Example: 50 is 25% of 200.
3) Find Percentage Increase
Use this formula: ((New – Old) ÷ Old) × 100. Example: from 100 to 150 = 50% increase.
4) Find Percentage Decrease
Use this formula: ((Old – New) ÷ Old) × 100. Example: from 200 to 150 = 25% decrease.
5) Find Percentage Difference
Use this formula: |A – B| ÷ ((A + B) ÷ 2) × 100. This is useful when comparing two values.
Common Percentage Calculations
- Calculate discounts while shopping
- Estimate sales tax on purchases
- Work out restaurant tips
- Check grade percentages
- Measure profit margin and revenue growth
- Compare savings growth over time
- Calculate price increase or decrease
- Understand loan or interest changes
Frequently Asked Questions
How do I calculate a percentage?
Multiply the number by the percentage and divide by 100.
How do I find percentage increase?
Subtract the old value from the new value, divide by the old value, then multiply by 100.
How do I find percentage decrease?
Subtract the new value from the old value, divide by the old value, then multiply by 100.
What is percentage difference?
Percentage difference compares two values using the average of those values.
How do I calculate discount percentage?
Subtract the sale price from the original price, divide by the original price, and multiply by 100.
How do I calculate tax percentage?
Divide the tax amount by the original price and multiply by 100.
This calculator is designed for quick everyday percentage calculations on mobile, tablet, and desktop.