The Percentage Calculator lets you solve any percentage problem instantly in your browser. Whether you need to find what 15% of 200 is, calculate the percentage change between two numbers, or figure out what percent one number is of another, this tool handles it in one click. Students, shoppers calculating discounts, business professionals analyzing growth rates, and anyone working with percentages will find this tool indispensable. All calculations happen locally - no data is sent anywhere.
Select the type of percentage calculation you need. 'X% of Y' finds a percentage of a number (e.g., 20% of 150). '% Change' calculates the percentage increase or decrease between two values. 'X is what % of Y' tells you what percentage one number represents of another.
Input the values for your selected calculation mode. For 'X% of Y', enter the percentage and the number. For '% Change', enter the original and new values. For 'X is what % of Y', enter the part and the whole. Decimal numbers are fully supported.
Press the Calculate button to compute your result instantly. The answer is displayed in a clear, formatted output that includes the full calculation context so you can verify the result at a glance.
Click the copy button next to the result to copy it to your clipboard. The copied text includes the full calculation description, making it easy to paste into documents, emails, or spreadsheets.
To calculate X% of Y, multiply Y by X and divide by 100. For example, 25% of 200 = 200 × 25 ÷ 100 = 50. This calculator does this automatically - just enter the percentage and the number, then click Calculate. This is useful for calculating tips, discounts, taxes, and proportions.
Percentage change is calculated as: ((New Value - Original Value) ÷ Original Value) × 100. A positive result means an increase, a negative result means a decrease. For example, if a price goes from $80 to $100, the change is ((100-80) ÷ 80) × 100 = 25% increase.
To find what percentage X is of Y, divide X by Y and multiply by 100: (X ÷ Y) × 100. For example, 30 is what percent of 150? Answer: (30 ÷ 150) × 100 = 20%. This is useful for calculating test scores, completion rates, and proportions.
To find the discounted price, use the 'X% of Y' mode. Enter the discount percentage and the original price. The result is the discount amount - subtract it from the original price to get the final price. For example, 30% of $89 = $26.70, so the discounted price is $89 - $26.70 = $62.30.
Yes, this calculator supports decimal percentages like 3.5%, 12.75%, or 0.5%. It also handles very large and very small numbers accurately. All calculations use JavaScript's full floating-point precision, giving you results accurate to many decimal places.