Percentage Calculator
Calculate percentage of a number, percentage change between two values, and find the original number from a percentage. Three calculators in one, no confusing math required.
What is X% of Y?
X is what percent of Y?
Percentage change from X to Y
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How to Use This Tool
- Choose the type of percentage calculation you need: percentage of a number, percentage change, or what percentage one number is of another.
- Enter your values in the appropriate input fields.
- View the calculated percentage result instantly.
- Use the result for financial calculations, grade computations, or data analysis.
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Frequently Asked Questions
How do I calculate the percentage of a number?
To find X% of a number, multiply the number by X and divide by 100. For example, 25% of 200 = (200 × 25) ÷ 100 = 50.
How is percentage change calculated?
Percentage change = ((new value - original value) ÷ original value) × 100. A positive result means an increase; a negative result means a decrease.
Can this calculator handle negative numbers?
Yes. You can calculate percentages with negative numbers, which is useful for financial scenarios like losses, temperature changes, or stock price movements.
Is this calculator accurate for financial calculations?
Yes. The calculations use precise arithmetic. However, for official financial reporting, you should round results according to your local accounting standards.
How do I calculate percentage increase or decrease?
To calculate percentage change: subtract the old value from the new value, divide by the old value, then multiply by 100. Our percentage calculator does this automatically -- just enter your two values.