**What Exactly Is Percentage Change?**

Before explaining how to use a percent calculator to determine percent change, percent difference, or percentage of one number from another, it is useful to review the principles of the notion of percentages.

A percentage is a dimensionless number that is stated as a fraction of 100; for example, 1 out of 10 is 10%, and 50 out of 100 equals 50%. A percentage is a ratio by definition.

The symbol for percent is “percent,” but the abbreviation “pct” is more commonly used, and “percent” can be found in older literature and documents, where “cent” is an abbreviation of the Latin “centum,” which properly means “one hundred,” so the phrase literally means “per one hundred.”

Percentages are widely used and have a wide range of uses. They are common in social sciences, accounting, finance, and economics.

We come across percent-off coupons frequently in daily life. Promotions, sales, and various discounts are usually represented as a percentage of a previous reference price for a good or service. Percentage calculations can be used to assess a person’s or machine’s productivity or workload, as in “he is working at 100 percent” (at maximum capacity).

The relative increase or decrease of something, such as a population, capital, or a person’s personal fortune, is stated as a percentage increase or decrease.

The discrepancies between any two things can be expressed as ratios or percentage differences. A percentage calculator can be used to quickly calculate a tool’s or process’s measurement inaccuracy in terms of percent error.

**How do you calculate percent change?**

Most people mean this when they ask, “How do I compute a percentage?” However, there are several approaches that can be utilised; see below for additional information.

Percent change calculators are widely used for comparing figures, business metrics, or other measurements over two time periods, with the earlier period serving as the baseline.

A percentage change estimate is particularly useful for comparing a current state of affairs to a previous one, such as when utilising the census to compare the population of villages in a particular municipality before and after industrialization. Although you may compute the percentage change on your own, our calculator makes it exceedingly simple to calculate the percentage gain or decrease.

For example, suppose you analyse your company’s success on a monthly basis and learn that you had 80 customers last month, compared to only 64 the previous month. To determine your company’s growth rate relative to its base value from the previous month, use the following calculation to compute percent change.

**Percentage Change Formula**

**Change in percentage = new / old * 100 – 100**

where new signifies a more recent quantity or measure and old denotes a more dated measure In the preceding case, this would be 80/64 * 100 – 100 = 1.25 * 100 – 100 = 125 – 100 = 25%. You can use the percentage change calculator to ensure that your monthly percentage change (percent growth, percent rise) was 25% compared to the previous month’s baseline.

In another situation, you may be considering a request to increase your annual salary from $100,000 to $120,000 in order to remain on the payroll, and you want to know what percentage of the new wage is higher than your previous one.

If you’re doing the math by hand, divide 120,000 by 100,000 to get 1.2. then multiply by 100 to get 120 Finally, subtract 100, leaving 20%. Because the new remuneration is 120 percent of your current wage, you received a 20 percent pay increase.

The calculator can also be used to calculate the rate at which certain modes of transportation change. According to the percentage change, a high-speed rail travelling at 120 miles per hour is twice as fast as a car or bus travelling at 60 miles per hour.

**How do you calculate what proportion of X is Y?**

Assume you work as a car salesman and have an automobile that was originally valued at $50,000. After doing some math, you realise that you can cut the price by $5,000 and still earn money from the deal.

What is the formula for calculating $5,000 as a percentage of $50,000? Although entering the values directly into the percent calculator above is obviously the easiest option, you can alternatively make the calculations manually using the following formula:

X is what percentage of Y? x = x / y * 100 percent of y

As a result, in this case, 5,000/50,000 * 100 = 0.1 * 100 = 10%. If you gave a $5,000 off coupon on a $50,000 car, it would be a 10% discount.

In a different circumstance, you might want to calculate the tax percentage of your annual revenue. If your yearly income is $80,000 and you have established that your total tax liability is $36,000, your tax rate is 36,000 / 80,000 / 100 = 0.45 * 100 = 45 percent.

**Percentage points vs. Relative percentages**

You may have observed that polls assessing each candidate’s favorability are commonly quoted in news articles about elections in the United States for members of the legislature, the premier, or the president of a town, municipality, or the entire country. Rather than percentages, percent points are frequently used to represent differences in sentiment and changes in the aforementioned polling indicators. A “percent point” based on a percentage is similar to an absolute difference.

This mode of our percent difference calculator does not support such computations, which are only applicable when comparing percentage differences. For example, support for candidate A may have been 40% prior to a particular political event but only 35% afterwards. Simply reducing 35% from 40% results in a 5 percentage point change (but is a percentage change of 12.5 percent).