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# Percentage Calculator

Percentage calculator is used to quickly and easily calculate tasks related to percentages. You can instantly find out the percentage of a number or check how much one number differs from another. Our percentage calculator will tell you what percentage a number is. You can also increase (add) or decrease (subtract) the number by the percentage (which you enter, in the appropriate place). Calculating percentages with this calculator is really easy. Enter a number in the appropriate box below and calculate the percentage you are interested in.

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## Definition of Percent

Percent (denoted by the symbol %) is a unit used to express a partial value as a percentage of a total number. It is a way of measuring the proportion or relationship of one value to another, where the whole is represented by the number 100. Percent is commonly used in various fields such as mathematics, economics, statistics, and percentage grades.

Formally, percent means hundredth, which means that 1 percent is equal to 1/100, or 0.01 in decimal form. It can be used to express both values greater than 1 (e.g., 50% = 50/100 = 0.5) and values less than 1 (e.g., 0.5% = 0.5/100 = 0.005).

For example, if we say that 30% of the apples in a basket are rotten, this means that out of 100 apples, 30 are rotten.

### Operations explanation, or how to calculate a percentage from a number on a calculator?

You may be wondering how to calculate a percentage from a number on a calculator. Below you will find answers on how to calculate percentages yourself (including using a calculator).

1. Calculating a percentage from a number

For example, if you want to know how much is `18% z liczby 1234`, use the following equation:
`(a / 100) * b`, where a is the percentage and b is the number for which we are doing the calculation. So:
`18% of the number 1234, to (18 / 100) * 1234 = 222.12`

2. To calculate what percentage of a number is another number

`(a / b) * 100`

3. To calculate the percentage difference between one number and another

Price differences between stores for the same products may vary by a few or several percent. To calculate the percentage difference between the price of a kilogram of potatoes in two different stores, use the formula:
`((b – a) / a ) * 100`

For example, if one kilogram of potatoes costs 1.55 \$ in one store and 1.78 \$ in the other store: `((1.78 – 1.55) / 1.55) * 100 = 14.84`

4. How to increase a given number by a given percentage

Are you wondering how to tip the waiter? E.g. 10? You have just received a bill for 85 \$. Use the following formula:
`a * (1 + b/100)`

That is: `85 * (1 + 10/100) = 93.5`

5. How to reduce a given number by a given percentage

The price of a dress is 230 \$, but there is a sign on the dress that says -15%. To quickly calculate how much the dress will cost after the discount, you need to reduce its price by 15%. The formula that solves this problem is
`a * (1 – b/100)`

That is: 230 * (1 – 15/100) = 195.5

### Percentage calculator - Usage examples

The above calculator can be useful in everyday life. Need an example? Here are a few:

• Wondering how much to leave as a tip at the restaurant for the dinner you just had with friends? Enter the amount from the bill in the appropriate field (second from the bottom) and increase it by the percentage you enter, in the second field (e.g. 10, 15, etc.). The result appears automatically. Very simple.
• Or maybe you play the stock market and wonder how much the stock of a company you have invested in has gone up. Use the middle form to find out how many percent the stock price has increased (or decreased) from its current valuation.
• Want to know how much a new phone with a 5% discount will cost you? Enter the amount for the phone (e.g. 825) in the last form and reduce it by the discount offered by the seller (e.g. 5). The result of the action will appear in the Result field (e.g. 783.75).
• If you know the amount after the discount and before the discount, you can find the percentage. To do this, use the third form by what percentage the number a differs from the number b. Substitute the amount before the discount in the variable a, and the amount after the discount (rebate) in the variable b. The result is the percentage of the discount.
• Calculating a percentage of a number, what percentage of a given number is another number, how much a number differs from another number, increasing or decreasing a number by a given percentage (colloquially: adding and subtracting percentages) are basic operations we may encounter in everyday life. It is worth learning these basic formulas to know how to calculate these percentages. And if we don't have time to calculate, we can quickly use our Percentage Calculator, which will do the calculations for us.
• What about inflation? Prices go up all the time. You can easily count how much the price of a product or service has increased compared to the previous price. In this case, you need to find out by how many percent the number a differs from the number b.
• Or maybe you want to know by how many percent you need to lose weight.

#### Who can use a percents calculator?

A percentage calculator can be useful to many people in many different areas. Here are some examples of groups that can benefit from a percentage calculator:

1. Students and scholars: Students and scholars can use the percentage calculator to calculate grades and percentages, analyze changes in test and exam scores, calculate percentage points on the grading scale, and study math and percentage problems.
2. Personal Finance: Those who manage their finances can use the Percentage Calculator to calculate interest, interest rates, investment growth, discounts, interest taxes and other aspects of personal finance.
3. Business and economics: Entrepreneurs, market analysts, economists and management professionals can use the Percentage Calculator to analyze financial data, calculate sales growth, market percentages, price changes, forecast economic growth and more.
4. Investment and banking: Investors and people interested in banking can use the Percentage Calculator to calculate investment returns, future value, interest rates, loan installments, bank interest and other aspects related to investment and banking.
5. Statistics and Research: Data analysts, social scientists, researchers and statisticians can use the Percentage Calculator to calculate survey results, statistical analysis, sampling percentages, demographic changes and other data analysis applications.

These are just a few examples, of course, but Percentage Calculator can be a useful tool for a wide range of people and professions where percentage calculations are important for analysis and decision-making.

##### Conclusion

The percentage calculator presented here works very well on desktop, laptop, tablet and smartphone browsers.

Is there an activity missing that you use often in your daily life? Do you always wonder how much a percentage is? Do you have an idea for a percentage calculation that would be useful to others? See how to contact us and write to us. We will try to expand our percentage calculator.