Let's try to find an answer to the question of what is 40% of 20? It is 40 hundredths of 20, so if we divided 20 cookies into 100 even parts (good luck with that!), 40 of those parts would be 40% of 20 cookies. To try to visualize it, imagine that we have something everyone likes, for example, a large packet of cookies (or donuts or chocolates, whatever you prefer □ - we will stick to cookies). Mostly, we want to answer how big is one number in relation to another number?. This is all nice, but we usually do not use percents just by themselves. If you're seeking more complicated problems, try to figure out how to calculate the percentage of a percentage. It is as simple as that, and this percentage calculator is a tool dedicated to working with decimal fractions and percentages. It means that 5 percent is the same as 5%, 5 pct, 0.05, 5/100, or five-hundredths. ![]() As a percent sign, we usually use %, but sometimes it is denoted by pct. Percentages are very popular since they can describe situations that involve large numbers (e.g., estimating chances for winning the lottery), average (e.g., determining final grade of your course) as well as very small ones (like volumetric proportion of NO₂ in the air, also frequently expressed by PPM - parts per million). Percentage is one of many ways to express a dimensionless relation of two numbers (the other methods being ratios, described in our ratio calculator, and fractions).
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