Calculate Percentage Decrease: Fast & Easy Tool for Students

How to Calculate and Understand Percentage Decrease with Examples

Percentage Decrease Calculator

What is Percentage Decrease?

Percentage decrease tells us by what percent a number or value has reduced compared to its original amount. In simple words, it shows "how much something went down" in relation to where it started. This concept is often used in everyday life, like when your exam marks drop, prices are reduced in sales, or populations decrease over time.

Formula or Logic Behind Percentage Decrease Calculator

The formula for calculating percentage decrease is:

Percentage Decrease = (Original Value − New Value) / Original Value × 100

Steps:

Find the difference between the original and new value
Divide the difference by the original value
Multiply the result by 100 to get the percentage decrease

Example: If a mobile phone's price was ₹20,000, and now it is ₹16,000:
Percentage Decrease = (20,000 − 16,000) / 20,000 × 100 = (4,000/20,000) × 100 = 20%

Common Percentage Decrease Calculations (Examples)

Original Value	New Value	Percentage Decrease (%)
100	80	20
250	150	40
800	600	25
345	276	20
60	12	80
2000	1700	15

Steps to Use the Percentage Decrease Calculator

Enter the required numbers in the "Original Value" and "New Value" fields
Click on the 'Calculate' button
Get instant results with all calculation steps shown below the result

Why Use Vedantu’s Percentage Decrease Calculator?

Vedantu’s Percentage Decrease Calculator is easy to use, fully mobile-friendly, and gives instant, step-by-step solutions. It is trusted by students, parents, and teachers across India, and is aligned with school exam requirements and competitive tests. Calculate clearly with no guesswork—perfect for assignments, business, and daily scenarios.

Real-life Applications of Percentage Decrease Calculator

The Percentage Decrease Calculator is useful in many areas:

Finding discount or sale price reductions when shopping
Calculating drops in marks between school exams
Comparing decline in populations, company profit, or sales
Measuring depreciation in value of vehicles or electronics
Data analysis in science experiments and statistics

You can also use this calculator as a learning tool for understanding percentages in maths. For more on related topics, you may want to check out Percentage Increase & Decrease, Discount Rate, or Applications of Percentage.

Explore more tools and maths explanations at Vedantu, like Prime Numbers, Factors of Numbers, or Algebra Topics.

FAQs on Calculate Percentage Decrease: Fast & Easy Tool for Students

1. How do you calculate percentage decrease?

Percentage decrease shows how much a value has reduced compared to its original amount. To calculate it, subtract the new value from the original value, divide the result by the original value, and then multiply by 100 to express it as a percentage. The formula is: [(Original Value - New Value) / Original Value] x 100.

2. What is the formula for percentage decrease?

The formula for percentage decrease is: [(Original Value - New Value) / Original Value] x 100. This formula helps determine the percentage reduction from an initial value to a final value.

3. What is 67 decreased by 26%?

To find 67 decreased by 26%, first calculate 26% of 67: (26/100) * 67 = 17.42. Then, subtract this value from 67: 67 - 17.42 = 49.58. Therefore, 67 decreased by 26% is 49.58.

4. How do you decrease a value by 25%?

To decrease a value by 25%, multiply the value by (100% - 25%) = 75%, or 0.75. For example, to decrease 200 by 25%, calculate 200 * 0.75 = 150. The new value after a 25% decrease is 150.

5. What’s the difference between percentage decrease and percentage increase?

Percentage decrease calculates the reduction in a value, while percentage increase calculates the growth in a value. Both use similar formulas but with different interpretations of the difference between the initial and final values. Percentage decrease uses (Original - New)/Original, while percentage increase uses (New - Original)/Original.

6. How to calculate percentage decrease from X to Y?

To calculate the percentage decrease from X to Y, use the formula: [(X - Y) / X] * 100. X represents the original value, and Y represents the new, smaller value. The result will be the percentage by which the value has decreased.

7. What is the percentage decrease from 1200 to 420?

The percentage decrease from 1200 to 420 is calculated as follows: [(1200 - 420) / 1200] * 100 = 65%. There is a 65% decrease from 1200 to 420.

8. What is the percentage decrease from 50 to 15?

The percentage decrease from 50 to 15 is calculated as: [(50 - 15) / 50] * 100 = 70%. The value decreased by 70%.

9. How do I find the percentage change if the value decreased?

If the value decreased, you're calculating a percentage decrease. Use the formula: [(Original Value - New Value) / Original Value] x 100. The result will be a negative number if you use this method for percentage increase, so remember to interpret the sign accordingly.

10. Give an example of percentage decrease in real life.

A common example is sale discounts. If an item was originally priced at ₹1000 and is now on sale for ₹800, the percentage decrease is [(1000 - 800) / 1000] x 100 = 20%. This means the item has been discounted by 20%.

11. Can I use this percentage decrease calculator for discounts?

Yes! Our percentage decrease calculator is perfect for quickly determining the discount percentage on items. Simply enter the original price as the 'Original Value' and the sale price as the 'New Value' to calculate the discount percentage.