Percentage Calculator

To calculate a percentage, divide the part by the whole and multiply by 100. For example, if you want to know what percentage 15 is of 50, divide 15 by 50 (which equals 0.3) and multiply by 100 to get 30%.

"Percent" is the symbol or unit (like 50%), while "percentage" refers to the portion or amount as a whole (like "a large percentage of students"). In practice, they’re used interchangeably in most cases.

Subtract the original value from the new value, divide by the original value, and multiply by 100. A positive result means an increase; a negative result means a decrease. For example, going from 100 to 125 is a 25% increase.

Percentage increase is the same as percentage change when the result is positive. Subtract the original value from the new value, divide by the original, and multiply by 100.

15% of 100 equals 15. To calculate: multiply 100 by 0.15, or divide 100 by 100 and multiply by 15. Both give the same answer.

Yes, completely free. No signup, no registration, no hidden fees. Use it as many times as you want.

No. All calculations happen in your browser and are never sent to any server. Your numbers are private.

The calculator uses standard JavaScript floating-point arithmetic and rounds results to four decimal places for display. For most everyday calculations, accuracy is essentially perfect. For extremely precise scientific or financial work requiring more than 10 decimal places, use specialized software.