Percentage Calculator

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About This Percentage Calculator

Welcome to Calculate My Percentage, your versatile tool for effortlessly solving a wide range of percentage calculations. Whether you're figuring out discounts, calculating growth rates, determining proportions, or working with finer per mille ratios, this calculator provides clear, accurate results. We cover common calculations such as finding 'X percent of Y', determining 'what percentage X is of Y', figuring out 'X is Y percent of what', calculating percentage increase or decrease between two values, and finding the percentage difference. Easily switch between Percent (%) and Per Mille (‰) modes to suit your specific needs. Bookmark this page for quick access!

FAQ

What is a percentage (%)?

A percentage represents a part of a whole expressed in hundredths. It's a fraction where the denominator is 100. The symbol '%' is used to denote percentage. For example, 25% means 25 out of 100, which is equivalent to the fraction 1/4 or the decimal 0.25. It's a common way to express proportions and changes.

How do you calculate a percentage?

There are several common percentage calculations: 1. Finding the percentage of a number: Convert the percentage to a decimal (divide by 100) and multiply by the number (e.g., 20% of 150 is 0.20 * 150 = 30). 2. Finding what percentage one number is of another: Divide the 'part' by the 'whole' and multiply by 100 (e.g., What percentage is 30 of 150? (30 / 150) * 100 = 20%). 3. Finding the whole when a part and percentage are known: Convert the percentage to a decimal and divide the 'part' by this decimal (e.g., 30 is 20% of what number? 30 / 0.20 = 150). Our online calculator handles these for you.

Why are percentages important?

Percentages provide a universal standard for comparing parts of a whole, regardless of the absolute size of the whole. This makes them invaluable in many areas: understanding statistics (e.g., election results, survey data), finance (e.g., interest rates, profit margins, discounts), science (e.g., error rates, concentrations), and everyday situations (e.g., sales tax, battery life, nutrition information). They simplify complex ratios into easily understandable numbers out of 100.

What is per mille (‰)?

Per mille, also written as per mil, means 'per thousand'. It's represented by the symbol '‰' (like a percent sign with an extra zero). It signifies a fraction where the denominator is 1000. For instance, 150‰ means 150 out of 1000, equivalent to 15% or the decimal 0.15. It's used when dealing with smaller proportions than typically expressed by percentages.

How do you calculate per mille?

The calculation is analogous to percentage, but you use 1000 instead of 100. 1. Finding the per mille of a number: Divide the per mille value by 1000 and multiply by the number (e.g., 50‰ of 2000 is (50 / 1000) * 2000 = 100). 2. Finding what per mille one number is of another: Divide the 'part' by the 'whole' and multiply by 1000 (e.g., What per mille is 100 of 2000? (100 / 2000) * 1000 = 50‰). Our calculator lets you switch to per mille mode for these calculations.

When is per mille used?

Per mille provides finer granularity than percentage, making it useful for specific measurements where proportions are typically small. Common examples include: measuring blood alcohol content (BAC), determining the salinity of seawater, expressing geological or railway gradients, calculating birth and death rates in demographics, and sometimes in finance for measuring things like basis points (though not directly the same).