Percentage Calculator 3 in 1, How to Calculate Percentage in 3 Different Case

Percentage Calculator

From discount to battery level, percentage is everywhere in our daily life. It is simply a way of expressing a number as a fraction of 100.

Percentage problems usually come in 3 different types. We designed a 3-in-1 percentage calculator for you. This makes our tool much more useful for engpocket friends daily life.

What is percentage

Percentage comes from the Latin per centum, means by the hundred. The symbol % is used to show that a number is a fraction of 100. For example, 50% means 50 per 100. 30% means 30 per 100. Etc

Daily life usage

• Shopping: Calculating how much you save during a 56% off sale.
• Finance: Calculating interest rates on loans or savings.
• Health: Measuring body fat percentage.
• Education: Calculating test scores (e.g., getting 45 out of 50 questions right).
• Business: Calculating profit margins or tax (VAT/GST).

Percentage formula

As we said before, percentage problems usually come in 3 different types. So does our percentage calculator works. Below we will tell you every detail of them.

Percentage Formula (find the value) To find P% of a number X

$\text{Value} = \frac{P}{100} \times X$

Percentage (part of a whole), find what percent number A is of number B

$\text{Percentage} = \frac{A}{B} \times 100$

Percentage Change (Increase/Decrease), find the percentage change from old value to new value

$\text{Change \%} = \frac{\text{New Value} – \text{Old Value}}{\text{Old Value}} \times 100$

Case example of percentage

Case 1
A shoes costs $80, but there is a 25% discount. How much do i save?
Answer: i Save $20

$\begin{aligned} \text{Discount} &= \frac{25}{100} \times 80 \\ &= 0.25 \times 80 \\ &= 20 \end{aligned}$

Case 2
My son scored 42 points out of a total of 50 on his English test. What is his percentage grade?
Answer: His score is 84%

$\begin{aligned} \text{Grade} &= \frac{42}{50} \times 100 \\ &= 0.84 \times 100 \\ &= 84\% \end{aligned}$

Case 3
Last year, a cup of coffee cost $2.00. This year, it costs $2.50. What is the percentage increase price for a cup of coffee?
Answer: A cup of coffee price increased by 25%

$\begin{aligned} \text{Increase} &= \frac{2.50 – 2.00}{2.00} \times 100 \\ &= \frac{0.50}{2.00} \times 100 \\ &= 0.25 \times 100 \\ &= 25\% \end{aligned}$

That is all about the percentage calculator post. We also have an average calculator where you can calculate average using our powerful calculator. Visit this link to try it.