Launch your online store

Online tools > Percentage calculator

Percentage Calculator

Percentages are invaluable tools. They enable you to see things more clearly, compare figures, and understand data without getting lost in complex calculations. They help to pinpoint performance, spot emerging trends and make decisions with greater confidence. Based on reliable data, a percentage becomes a kind of snapshot of a situation. It reflects a precise reality at a given moment, which is essential to avoid getting lost in suppositions. Basing your analyses on reliable statistics, such as percentages, means choosing security and clarity, so you can move forward in the right direction.

Select Calculation

Percentage (%) Of a number

Number Percentage increase (%)

Number Percentage decrease (%)

Number In relation to

Initial number Final number

OUR PERCENTAGE CALCULATOR

With our online tool, you no longer need a calculator for your percentage formulas: consult this site for each variation you are looking to calculate in just a few clicks!

📊 Calculate a percentage of a number	Enter a percentage and a number to find out how much it represents.
⬆️ Apply a percentage increase	Calculate how much a number increases based on a given percentage.
⬇️ Apply a percentage decrease	Calculate how much a number decreases based on a given percentage.
🔢 Find the percentage of a number in relation to another	Compare two numbers to see what percentage the first represents in relation to the second.
🔄 Find the percentage change between two numbers	Measure the increase or decrease in percentage between two values.

CALCULATE A PERCENTAGE OF A NUMBER

This type of calculation is important for analyzing proportions or ratios. It enables you to prioritize and direct marketing or sales efforts towards the most profitable segments. Our calculator will help you make this calculation in a matter of seconds!

Application example: If a company makes 50 sales out of a total of 200, calculating the percentage leads to the conclusion that this activity represents 25% of total sales.

APPLY A PERCENTAGE INCREASE

Percentage increases are often used to adjust prices, salaries, or budgets in line with expected growth. This ensures that adjustments reflect economic reality while remaining proportionate.

Application example: If an employee earns $2,000 a month and their salary is increased by 10%, their new salary will be $2,200.

APPLY A PERCENTAGE DECREASE

This type of calculation is frequently used in cost reduction strategies, trade discounts, or promotions. It enables you to adjust prices or budgets while controlling the financial impact.

Application example: A product priced at $500 benefits from a 20% discount. After applying the discount, the new price will be $400.

FIND THE PERCENTAGE OF A NUMBER IN RELATION TO ANOTHER

This calculation is useful when you need to determine the exact proportion an element represents in a whole. This is common in distribution analyses or financial balance sheets.

Application example: If a company spends $5,000 on advertising out of a total marketing budget of $50,000, the percentage of advertising expenditure is 10%.

FIND THE PERCENTAGE CHANGE

Analyzing percentage changes enables us to assess performance between two periods or two states. It is important for measuring growth, declines, or deviations.

Application example: If sales increase from $100,000 to $120,000, the percentage change is 20%.

RULES FOR CALCULATING PERCENTAGES

________________

Percentage of a number

Result = Number × (Percentage ÷ 100)

To calculate a percentage of a number, the formula is as follows: you multiply the number by the percentage, converting the percentage into a decimal value. For example, to find 20% of an amount, divide 20 by 100, which gives 0.2, then multiply this result by the starting amount.

Percentage increase

New value = Initial value × (1 + Percentage ÷ 100)

When you want to increase a value by a certain percentage, you add this percentage to the starting total. This is equivalent to adding the corresponding fraction of the percentage to the initial amount. If an amount is to be increased by 15%, this means adding 15% of the amount to itself.

Percentage decrease

New value = Initial value × (1 - Percentage ÷ 100)

To decrease a value by a given percentage, you subtract that percentage from the initial total. In practice, this means removing the equivalent fraction of the starting amount. For example, a 20% reduction means you remove 20% from the starting total.

Percentage of a number in relation to another

Percentage = (Partial value ÷ Total value ) × 100

To determine what percentage an element represents in relation to a whole, divide the value of that element by the total value and multiply by 100. This shows the proportion of an element in a whole.

Percentage change

Percentage change = ((Final value - Initial value) ÷ Initial value) × 100

To measure how much a value has changed as a percentage, you calculate the difference between the initial value and the final value, then compare that difference to the starting value. This indicates whether the value has increased or decreased, and by how much, as a percentage.

PERCENTAGE RATE FAQ

How do you calculate a percentage of a number?

To calculate a percentage of a number, simply divide the part by the whole, then multiply the result by 100. For example, if you want to know what percentage 25 represents of 200: (25÷200) × 100 = 12.5%

How do you use the rule of three to find a percentage?

The rule of three is a practical method for calculating a percentage when you know a proportional relationship. Imagine that 40 represents part of a whole of 200, and you want to know the percentage:

Put the data in proportional form: 40 / 200 = x / 100
Solve the equation by crossing: x = (40×100) ÷ 200
You get x = 20%.

How do you calculate a percentage difference between two values?

To calculate the percentage difference between two values, you first measure the difference between them, then relate this difference to the starting value. Next, multiply by 100 to obtain the percentage.

For example, if a product goes from $50 to $65:

Difference: 65 - 50 = 15
Ratio: 15 ÷ 50 = 0.3
Result: 0.3 × 100 = 30%.

Create your online store with Wizishop

Access, browse and test all of our features with our 7-day trial, no strings attached