Percentage Calculator with SeCalcula.

Online Percentage Calculator makes it easy to know how much a certain product costs with percentage.

Value:
Percentage to be applied:

With the Percentage calculator it is very simple to calculate the percentage giving the initial figure and the percentage that you want to apply to it.

How to use the percentage calculator

It's very simple. Just enter the initial value, and then indicate in number, the percentage to apply. and then click "Calculate! The website will give you three values:
• The percentage value of that number. As Example, 21% of 100 is 21..
• The value added to the initial value i.e. 21% of 100 is 21%, so if you add 21% to 100, you will give us 121.
• The value subtracted from the initial value, that is, the value to which, if you add 21%, it gives you 100./li>

Do you know what the percentage is?

A percentage is a mathematical formula, which gives us the proportion in quantity, of a fraction in 100 parts. This may sound somewhat odd, but it is quite simple.

What a percentage does is to indicate a ratio of increase or decrease of a value based on an example of 100 units. So, we can say that if out of 100 units, for example, we want 20, if we have 200, it will be 2 times 100, that is, 20 by 2 which is 40.

To indicate a percentage, the symbol "%" is used wordwide.

What's the percentage? - How do you find the percentage of something?

Percentage is one of the many ways of expressing a dimensionless proportion of two numbers. It is very popular because it can describe situations that involve large numbers (e.g., estimating the chances of winning the lottery), average (e.g., determining the final grade for your course) as well as very small (e.g., the volume proportion of NO₂ in the air, also frequently expressed by PPM - parts per million). One percent is a hundredth. As a percentage sign, we usually use %, but sometimes it is denoted by pct . This means that 5 percents is the same as 5%, 5 pct, 0.05, 5/100 or five hundredths. It is as simple as that, and this percentage calculator is a tool dedicated to working with decimal fractions and percentages. If you are looking for more complicated problems, try to figure out how to calculate the percentage of a percentage. All this is fine, but normally we don't use percentages alone. Above all, we want to answer, how big is a number in relation to another number? To try to visualize it, imagine that we have something everyone likes, for example, a big pack of cookies (or doughnuts or chocolates, whichever you prefer 😉, we will limit ourselves to cookies). Let's try to find an answer to the question of what is 40% of 20? That's 40 hundredths of 20, so if we divided 20 cookies into 100 equal parts (good luck with that!), 40 of those parts would be 40% of 20 cookies. Let's do the calculations: 40/100 * 20 = 8. A useful little tip: to divide by 100, simply move the dot two spaces to the left. In our calculation, 40/100 * 20 could be done as (40 * 20) / 100 (it's the same). 40 * 20 is 800. When you move the point in 800 by two digits to the left, you get 8.00, and when you remove all the unnecessary zeros, you get 8. At our percentage calculator , enter 40 and 20 (so it says "40% of 20" is 8).

Percentage history - percentage sign

Although ancient Romans used Roman numerals I , V , X , L , etc., calculations were often made in fractions that were divided by 100. It was equivalent to the calculation percentages we know today. Calculations with a denominator of 100 became more standard after the introduction of the decimal system. Many of the medieval arithmetic texts applied this method to describe finances, for example, interest rates. However, the percentage of sign% that we know today only became popular recently, in the twentieth century, after years of constant evolution. The term percentage is usually attributed to the latin percent, that is to say, percent. Actually, it's wrong. We get the term Italian per cent - per cent. The percentage of sign% evolved by the gradual contraction of those words over centuries. Finally, the cento has taken the form of two circles separated by a horizontal line, from which the modern symbol% is derived. The history of mathematical symbols is sometimes astounding. We recommend that you take a look at the origin of the square root symbol! Recently, the percentage symbol is widely used in programming languages as an operator. It usually means the module operation. On the other hand, in experimental physics, the symbol % has a special meaning. It is used to express the relative error between the true value and the observed value found in a measurement. Have you ever known a percentage symbol that had an additional circle? That's not a mistake! There are two related signs:
• ‰ - per thousand - per thousand,
• ‱ - per thousands - per ten thousand (also known as base point),
Later in the text, we explain in more detail what is meant by millennium, what is a base point and how to convert by milestones and base points to percentages. Higher proportions use another note (called parts per note), for example, parts per million (PPM), which is often used to measure the concentration of a substance in solution or mixture.

How are percentages used?

• Discounts in stores: 25 percent discount.
• The sales tax is usually a percentage of the purchase price: 8% of the sales tax.
• Interest rates on savings accounts are generally shown as an annual percentage rate (April): 1.5% April.
• Interest rates charged by credit card companies and mortgage companies are shown as an annual percentage rate.
• Changes in interest rates: interest rates rose one percentage point from 4.5% to 5.5%
• .
• Statistics: the margin of error is plus or minus four percentage points
• Credit card rewards: 2% cash back for certain purchases
• News: Approval rates, employment rate and surveys can be expressed using percentages
• .
• Portable computers, tablets, and cell phones generally have a battery charge percentage indicator
• .
• Weather forecast: 20 percent probability of rain
• Probability: the chance of winning a prize is 1 in 10 or 10 percent
• Humidity: the humidity level is 65%.