How do you calculate a percentage?

To calculate a percentage of a value, divide the part by the whole and multiply by 100. For example, if you want to find what percentage 20 is of 80: (20 / 80) * 100 = 25%.

What is the formula for percentage increase?

The formula for percentage increase is: ((New Value - Old Value) / Old Value) * 100. For example, if a price increases from $50 to $60, the increase is ((60 - 50) / 50) * 100 = 20%.

Percentage Calculator

Calculate percentages, percentage increases, decreases, differences, and values with this fast and free online percentage calculator.

Percentage Calculation Sheet

1) What is X% of Y?

Percentage (X)

Of Value (Y)

2) X is what percent of Y?

Value (X)

Total Value (Y)

3) Percentage Increase/Decrease

From Value (X)

To Value (Y)

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About Percentage Calculator

Our online Percentage Calculator solves three of the most common percentage problems encountered in business, math, science, and everyday shopping. Whether you need to figure out sales taxes, store discounts, tips, or investments return percentage, this tool offers precise results instantly.

Formulas Used:

What is X% of Y: Result = (X / 100) * Y
X is what % of Y: Result = (X / Y) * 100
Percentage increase/decrease from X to Y: Result = ((Y - X) / X) * 100

Example Use Case: If a laptop increases in price from $800 to $920, type 800 as X and 920 as Y. The calculator reports a 15% increase.