What is Percentage Calculator Online?

Percentage calculator is a simple digital tool that helps users perform percentage-based calculations instantly without manual formulas. It is commonly used to find percentage values, reverse percentages, determine percentage increases or decreases, and compare proportions.

Whether you're working with discounts, grades, taxes, financial data, or general math problems, an online percentage calculator speeds up the process and eliminates errors.

What is a percentage?

In mathematics, a percentage is a number or ratio that represents a fraction of 100. It is one of the ways to represent a dimensionless relationship between two numbers; other methods include ratios, fractions, and decimals. Percentages are often denoted by the symbol "%" written after the number. They can also be denoted by writing "percent" or "pct" after the number. For example, 35% is equivalent to the decimal 0.35, or the fractions percentage formula

Percentages are computed by multiplying the value of a ratio by 100. For example, if 25 out of 50 students in a classroom are male, percentage multiplying . The value of the ratio is therefore 0.5, and multiplying this by 100 yields:

0.5\times100=50

In other words, the ratio of 25 males to students in the classroom is equivalent to 50% of students in the classroom being male.

Percentage formula

Although the percentage formula can be written in different forms, it is essentially an algebraic equation involving three values.

P \times V 1 = V 2

P is the percentage V₁, is the first value that the percentage will modify, and V₂ is the result of the percentage operating on V₁. The calculator provided automatically converts the input percentage into a decimal to compute the solution. However, if solving for the percentage, the value returned will be the actual percentage, not its decimal representation.

EX: P \times 30 = 1.5

P = 1.5 30 = 0.05 \times 100 = 5%

Percentage difference formula

The percentage difference between two values is calculated by dividing the absolute value of the difference between two numbers by the average of those two numbers. Multiplying the result by 100 will yield the solution in percent, rather than decimal form. Refer to the equation below for clarification.

Percentage Difference = |V 1 - V 2 | (V 1 + V 2)/2 \times 100

Percentage change formula

Percentage increase and decrease are calculated by computing the difference between two values and comparing that difference to the initial value. Mathematically, this involves using the absolute value of the difference between two values then dividing the result by the initial value, essentially calculating how much the initial value has changed.

The percentage increase calculator above computes an increase or decrease of a specific percentage of the input number. It basically involves converting a percent into its decimal equivalent, and either subtracting (decrease) or adding (increase) the decimal equivalent from and to 1, respectively. Multiplying the original number by this value will result in either an increase or decrease of the number by the given percent. Refer to the example below for clarification.

EX: 500 increased by 10% (0.1) 500 \times (1 + 0.1) = 550 500 decreased by 10% 500 \times (1 - 0.1) = 450

What is 20% out of 70?

To find 20% of 70, you multiply:

70 × 0.20 = 14
So, 20% out of 70 is 14

How to Use Percentage Calculator Tool?

Using an online percentage calculator is straightforward and requires only basic input:

Choose the type of percentage calculation — such as “What is X% of Y?”, percentage increase, decrease, or reverse percentage.
Enter the required values — the percentage and the base number.
Click the Calculate button — the tool instantly computes an accurate result.
Review or copy the output — copy the results using the copy button.

Percentage Calculator