Percentage Calculator

Calculation Type

X (percentage) Enter a valid number.

Y (of number) Enter a valid number.

Result

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How to Use This Tool

Select the type of percentage calculation you need from the dropdown.
Enter the two values requested (labels update automatically based on your selection).
Click Calculate to get your result instantly.
Switch calculation types anytime to explore a different percentage question with the same numbers.

Three Common Percentage Calculations

Percentages come up constantly in daily life — discounts, exam scores, tips, growth rates — but the underlying question varies. This calculator handles the three most common variations:

1. What is X% of Y?

Formula: (X ÷ 100) × Y — used for calculating discounts, tips, tax amounts, or any "percentage of a total" question.

2. X is what percentage of Y?

Formula: (X ÷ Y) × 100 — used for finding what share or proportion one number represents of another, like marks scored out of total marks.

3. Percentage Change from X to Y

Formula: ((Y − X) ÷ X) × 100 — used for calculating growth, decline, price changes, or performance improvement between two values. A positive result means an increase; negative means a decrease.

Common Use Cases

Calculating discounts and sale prices while shopping
Working out exam or test score percentages
Measuring year-over-year growth in sales, salary, or investments
Splitting bills, tips, and commissions

Frequently Asked Questions

How do I calculate a discount using this tool?

Use "What is X% of Y?" with X as the discount percentage and Y as the original price to find the discount amount, then subtract it from the original price.

What does a negative percentage change mean?

A negative result in the "% Change from X to Y" mode means the value decreased — for example, −10% means the new value is 10% lower than the original.

Can I use decimals in this calculator?

Yes, all fields accept decimal numbers for more precise calculations.

This calculator is provided for general informational and estimation purposes only. Results should not be treated as professional financial, tax, legal, medical, or engineering advice. Always verify critical calculations with a qualified professional or official source before making decisions.