12 Methods to Calculate Percentage (%), Percentage Calculation Formulas

Percentage calculation % is the most common type of calculation we encounter. Among them, the most common are calculating percentage % difference between 2 years, calculating % bank interest, percentage growth, calculating % profit, percentage completion, methods for calculating percentage % product discounts,...

The fastest and most accurate ways to calculate percentage

Fastest and most accurate methods to calculate percentage %

1. Method for calculating percentage ratio

Calculating the percentage ratio on the total is a common method in percentage calculations today. To calculate the percentage of a number or the % of an object among several objects, simply divide the number of objects to be calculated by the total number of objects, then multiply by 100 to get the result.
- Calculate % of a and b:
+ Percentage ratio of a = a/(a+b)*100(%).
+ Percentage ratio of b = b/(a+b)*100(%) or %b = 100 - %a.

Example: Suppose you have a problem that requires calculating the percentage of outgoing shipments, with 35 boxes of clothes and 30 boxes of pants. What percentage of the total shipped items are clothes?
==> Percentage of clothes

==> Percentage of pants = 100 - 53.8 = 46.2% or

2. Fastest way to calculate percentage discount

- Formula: Amount after discount = Price x [(100 - % discount)/100].
- Example: You go shopping and choose an item priced at 500 thousand dong, with a 20% discount. So, what is the fastest way to calculate the percentage discount?
==> Applying the formula above to the example, we have the following information: 20% discount, meaning 100% - 20% = 80% => 80/100 = 0.8.
==> Therefore, the price of the item after discount will be: 500 thousand dong x 0.8 = 400 thousand dong.

3. Fastest way to calculate percentage increase

- To quickly calculate percentage increase, you can also apply a similar method as calculating percentage discount above.
- Example: An item is priced at 500 thousand dong, but now the price of the product increases by an additional 20%, the quick calculation formula will be as follows: 100% + 20% = 120%.
==> Therefore, the amount you have to pay will be: 500 thousand x 120% = 500 thousand x 1.2 = 600 thousand dong.

4. Method for calculating percentage % interest rate

- To calculate profit percentage or interest rate percentage, specifically bank interest rate, Mytour has referred to numerous specific cases, various banks in this field. Readers can refer to how to calculate, view bank interest rates through the detailed article here. The article describes referencing bank interest rates as well as calculating interest when you deposit in the bank.

5. Method for calculating growth percentage, comparing % difference

- Calculating growth percentage to compare % difference is also a way to calculate profit percentage. This method will calculate the % difference between 2 different values.

- Formula for calculation will be: (b-a)/a x 100 (%).
- Where: b is the number you need to compare the difference; a is the benchmark for your comparison.
- Example: Related to revenue. You have revenue in April is 400 million dong, revenue in May is 500 million dong. Calculate the growth percentage of May compared to April.
==>Growth percentage of May = (500 - 400)/400 x 100 = 25%

The percentage above may be a negative number if the revenue of the subsequent months is lower than the previous month. For example, the revenue in June is 600 million, but in July, the revenue is only 550 million => the percentage difference is calculated as July revenue decreases by 50 million compared to June. Similarly to the calculation above, the result will be: % growth of July = (550 - 600)/600 x 100 = -8.3%.

6. Quick Calculation of Percentage % between 2 years

- Assuming there is a company named Mytour with revenue in 2016 of 115 billion dong. The total revenue for the entire year of 2017 is 132 billion dong. So, what is the percentage growth, difference between the two years through this percentage % calculation.
- We will have percentage % growth in 2017 = (Revenue 2017 - Revenue 2016) / Revenue 2016 * 100 = (132 - 115) / 115 = 14.78 (%).

7. How to Calculate Completion Percentage

- Example: Mytour company set a target of 150 billion dong for 2017. By the third quarter of 2017, the company achieved 159 billion dong in total revenue. What is the completion percentage compared to the initial proposal? Apply the formula: Percentage completed = Revenue achieved / Revenue target * 100. Thus, the percentage achieved is 106%. Conclusion: After only 3 quarters, Mytour company exceeded the proposed target by 6%.

8. How to Calculate Merchandise Percentage

- Assume you purchase a laptop priced at 25 million dong with an 8% discount code. How much money do you save and how much do you have to pay? Apply the percentage calculation method: Discount amount = Percentage * Price / 100.

In Excel, users can easily apply specific scenarios to calculate percentages such as salary percentages, volume percentages, mass percentages in chemistry, tax percentages, and more. You can readily utilize built-in percentage formulas in Excel. The Excel software already integrates pre-built percentage formulas, eliminating the need for manual calculation. Simply apply the formula to get the desired result.

Explore more: How to calculate percentage in Excel

11. How to calculate salary percentage

Comparing old salary to new salary using the formula: (New salary - Old salary) : Old salary x 100.
Example: If the salary for July is 7.7 million VND, and the salary for June is 6.4 million VND, the percentage increase/decrease of July compared to June = (7.7 - 6.4) : 6.4 x 100 = 20.31%.

For those delving into the realm of chemical mass percentage formulas, this article is a must-read. Mytour provides detailed insights for easy application of the formulas in exercises.

Explore further: Calculating mass percentage