Percentage Calculator

Using this percentage calculator is simple:

1. Select a mode from the dropdown: "What is X% of Y?", "X is what % of Y?", or "% change from X to Y".
2. Enter Number A in the first field. Depending on the mode, this is the percentage, the part, or the starting value.
3. Enter Number B in the second field. This is the base number, the whole, or the ending value.

The calculator instantly displays the result and a plain-language description of the calculation.

A percentage calculator is a versatile math tool that performs the three most common percentage calculations: finding a percentage of a number, determining what percentage one number is of another, and computing the percentage change between two values.

Percentages are used everywhere in daily life, from sales tax and discounts to test scores, statistics, and financial growth rates. This calculator simplifies all of these operations into one easy-to-use interface.

The three percentage formulas used:

• Percentage of a number: Result = (A / 100) × B
• What percent is A of B: Result = (A / B) × 100
• Percentage change: Result = ((B − A) / |A|) × 100

Where A is Number A and B is Number B as entered in the calculator.

Example 1 (Percent of): What is 15% of 300? Enter mode "What is X% of Y?", A = 15, B = 300. Result: 45.

Example 2 (Percent is): 36 is what percent of 150? Enter mode "X is what % of Y?", A = 36, B = 150. Result: 24%.

Example 3 (Percent change): A product price changed from $80 to $100. Enter mode "% change from X to Y", A = 80, B = 100. Result: 25% increase.