Percentage Calculator

To find what percentage one number is of another, divide the first number by the second number and multiply by 100. For example, to find what percentage 25 is of 100: (25 ÷ 100) × 100 = 25%.

Percentage increase occurs when the new value is greater than the original value, resulting in a positive percentage. Percentage decrease occurs when the new value is less than the original value, resulting in a negative percentage.

To calculate a discount percentage, subtract the sale price from the original price, divide by the original price, and multiply by 100. Formula: ((Original Price - Sale Price) ÷ Original Price) × 100.

Yes, our calculator works with decimal numbers. You can enter values like 12.5, 0.75, or 99.99. The calculator will handle all decimal calculations accurately and display results with appropriate precision.

A percentage over 100% means the value is greater than the reference point. For example, if something increases by 150%, it means the new value is 2.5 times the original value (100% + 150% = 250% of the original).

Our calculator uses JavaScript's built-in mathematical functions, which provide high precision for most practical purposes. Results are typically accurate to 10+ decimal places, though we display results rounded to a reasonable number of decimal places for readability.

Absolutely! This calculator is perfect for business use, including calculating profit margins, growth rates, commission percentages, tax calculations, and discount pricing. It's designed to handle professional-level calculations with accuracy.

Yes, our percentage calculator is completely free to use. There are no hidden fees, registration requirements, or usage limits. You can perform unlimited calculations anytime, anywhere, on any device.

Yes, our calculator is fully responsive and optimized for mobile devices. It works seamlessly on smartphones, tablets, laptops, and desktop computers. The interface automatically adapts to your screen size for the best user experience.

For compound growth, use the formula: Final Value = Initial Value × (1 + growth rate)^number of periods. While our basic calculator handles simple percentage calculations, compound growth requires multiple steps or specialized financial calculators.