Percentage Calculator

Percentage Calculator

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What is a Percentage?

A percentage is a number that represents a proportion of a whole. It expresses an amount as a fraction of 100. For example, 25% means 25 out of 100. Percentages are used to express ratios and fractions in a more readable way.

Percentages allow us to compare amounts or quantities using a common base of 100. They make it easier to understand relative sizes and amounts. For instance, if there are 500 students in a school and 300 of them are girls, we can say 60% of the students are girls (because 300/500 = 0.6 = 60%).

Some key things to know about percentages:

  • They are expressed with the percent symbol (%) after a number.

  • The percentages are proportional to the total size.

  • They can take values from 0% to 100%. 0% means none of the total, 100% means all of the total.

  • Common percentages we see everyday include tax rates, discounts, interest rates, polls, test scores, etc.

Understanding percentages allows us to make better sense of statistics, comparisons, and proportions in everyday life. The basics of percentages are easy to grasp with some practice.

How to Calculate Percentage

There are a few simple methods to calculate percentages:

  1. Convert the percentage to a decimal: Divide the percentage by 100. For example, 25% becomes 0.25. This decimal can then be multiplied with the total amount to find the percentage.

  2. Use the percentage formula: Amount = Percentage x Total / 100. For example, if the percentage is 30% and total is 500, then Amount = 30 x 500 / 100 = 150.

  3. Set up a proportion: Percentage / 100 = Amount / Total. Cross multiply to find the amount. For 30% of 500, the proportion would be: 30/100 = Amount/500. Cross multiply to get: Amount = (30 x 500) / 100 = 150.

Using these methods, you can easily find any percentage of a given total amount. With some practice, percentage calculations can become second nature.

How to Use the Percentage Calculator?

Toolur online percentage calculator is a useful tool for quickly and easily performing percentage calculations.

Here are some tips for using a percentage calculator for basic calculations:

  • Enter the total amount or number into the applicable field.

  • Enter the percentage value you want to calculate into the percentage field. Make sure to enter just the number without the % symbol.

  • The calculator will automatically update the amount field with the percentage of the total.

  • For finding percentages, enter the subset amount and total amount. The calculator will determine the percentage.

  • Make sure to double check your inputs to avoid errors. Human error is common with calculators.

  • Pay attention to the labels and units. For example, a 25% increase vs a 25% discount will give different results.

With these tips, you can easily find percentages, amounts, discounts, increases, and more. The calculator eliminates the manual work of setting up proportions or formulas.

Advanced Calculations with the Percentage Calculator

While good for basic calculations, advanced percentage calculators can also handle more complex scenarios:

  • Percent change: Calculate the percentage increase or decrease from one number to another.

  • Percent of total: Find the percentage contribution of a part to the whole across multiple values.

  • Percentiles: Determine the value below which a percentage of the data falls.

  • Compound interest: Calculate interest earned on interest over time.

  • Tax calculations: Estimate take-home pay after tax percentages.

  • Tip calculator: Split the bill based on custom tip and tax percentages.

For advanced uses, make sure to select a calculator with these capabilities. Look for options to enter multiple values and percentages. Understand the order of calculations and double check formulas.

Percentage Formula

Formula for Calculating a Percentage

The basic percentage formula is:

Percentage = Amount / Total x 100


  • Percentage is the percentage value you are trying to find.

  • Amount is the subset amount that the percentage represents.

  • Total is the full set or total amount.

For example, if you had 25 questions correct on a test with 50 total questions, the percentage would be:

Percentage = 25 / 50 x 100 = 50%

To use this formula:

  1. Identify the subset amount you want to find the percentage for.

  2. Determine the total amount.

  3. Divide the subset amount by the total.

  4. Multiply the result by 100 to convert to a percentage.

This formula works for finding any part-to-whole percentage. Make sure the units match when plugging amounts into the formula.

Finding the Percentage of a Number

To find a percentage of a given number, the formula is:

Amount = Percentage x Number / 100


  • Amount is the percentage amount you want to find.

  • Percentage is the percentage rate.

  • Number is the total number.

For example, to find 25% of 80:

Amount = 25 x 80 / 100 = 20

The steps are:

  1. Multiply the percentage rate by the total number.

  2. Divide the result by 100 to convert from a decimal percentage.

This formula is useful for finding percentages for discounts, taxes, tips and more. Plug in the values and let the formula do the work!

Other Examples

Calculating Percentages in Real World Scenarios

Here are some examples of using percentages in real life situations:

Sales Tax:

The sales tax on a $50 purchase with a 8% tax rate is 8% of $50 = 0.08 x $50 = $4.


When leaving a 15% tip for a $40 restaurant bill, 15% of $40 is 0.15 x $40 = $6.


The discount on a $500 TV with a 30% discount is 30% of $500 = 0.3 x $500 = $150. So the sale price is $500 - $150 = $350.


The simple interest earned on a $10,000 loan with a 4% annual interest rate over 5 years is 4% x $10,000 x 5 years = $2,000.

Test Score:

If you scored 85 out of 100 points on a test, your percentage score is 85/100 x 100 = 85%.

Understanding how to calculate percentages allows you to easily determine amounts for percentage-based scenarios in everyday life.

Examples of Percentage Calculations

Here are some more examples of using percentages in calculations:

  • What is 20% of 50?
    20% of 50 = 0.2 x 50 = 10

  • 35 is what percentage of 80?
    35/80 x 100 = 43.75%

  • What is 7.5% of 400?
    7.5% of 400 = 0.075 x 400 = 30

  • A population increased from 50,000 to 55,000. What was the percentage increase?
    Percentage increase = (Change/Original) x 100
    = (55,000 - 50,000)/50,000 x 100 = 10%

  • How much is the discount if a $250 TV is 25% off?
    25% of $250 = 0.25 x $250 = $62.50 discount
    Sale price = $250 - $62.50 = $187.50

Practicing calculations like these helps build familiarity with using percentages. Remember the main formulas and try applying percentages to everyday situations.

Understanding Difference Between Percentages and Decimals

While related, percentages and decimals are different:

  • Percentages represent a part-to-whole relationship and are expressed with a % symbol.

  • Decimals are numbers that contain fractional parts less than 1.

Some key differences:

  • Percentages range from 0% to 100%. Decimals have a much broader range.

  • To convert a percentage to a decimal, divide it by 100. 25% becomes 0.25.

  • Decimals and percentages have different meanings. 0.25 means 25 hundredths. 25% means 25 per hundred.

  • In calculations, decimals are used directly. Percentages are divided by 100 first.

Understanding these differences allows you to use percentages and decimals appropriately based on the context and desired meaning.


Alex Smith


I build online web software to simplify and solve daily life problems.

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