About This Tool
This percentage calculator offers three powerful calculators: find what percentage one number is of another, calculate percentage increase or decrease, and determine ratios. Perfect for finance, shopping, and math.
Percentage Calculator
What is X% of Y?
0
X is what % of Y?
0%
Percentage Increase/Decrease
0%
0
How to Use
- Choose which type of percentage calculation you need from the three calculators above
- Enter your numbers into the appropriate fields
- Results calculate automatically as you type
- Use the percentage increase/decrease calculator to see both the percentage change and absolute difference
Common Uses:
- Finance & Business: Calculate discounts, tax rates, profit margins, and investment returns
- Shopping & Sales: Determine sale prices and calculate how much you save with discounts
- Education & Homework: Solve percentage problems for math assignments and tests
- Statistics & Analysis: Calculate percentage changes in data sets and growth rates
- Budgeting: Track spending changes and calculate expense percentages of your income
Frequently Asked Questions
How do I calculate what percentage one number is of another?
Use the "X is what % of Y?" calculator. Divide the first number by the second number and multiply by 100. For example, 25 is 25% of 100 because (25 / 100) × 100 = 25%.
How do I calculate percentage increase or decrease?
Subtract the original value from the new value, divide by the original value, then multiply by 100. Formula: ((New - Original) / Original) × 100. A positive result is an increase, negative is a decrease.
What is 20% of 150?
To find 20% of 150, multiply 150 by 0.20 (which is 20/100). The answer is 30. Use the "What is X% of Y?" calculator above for instant results.
How do I calculate a discount percentage?
If an item costs $100 and is on sale for $80, the discount is $20. To find the percentage: (20 / 100) × 100 = 20% off. Use the percentage increase/decrease calculator with the original price and sale price.
Is my calculation data stored when I use this percentage calculator?
No. All calculations happen locally in your browser. No data is sent to our servers or stored anywhere. Your privacy is completely protected.
Can I calculate negative percentages?
Yes. The percentage increase/decrease calculator shows negative percentages when the new value is less than the original value, indicating a decrease.