102 LearnersLast updated on August 5th, 2025
Percentage Calculator
Calculators are reliable tools for solving simple mathematical problems and advanced calculations like trigonometry. Whether you’re cooking, tracking BMI, or planning a construction project, calculators will make your life easy. In this topic, we are going to talk about percentage calculators.
What is a Percentage Calculator?
A percentage calculator is a tool that helps you find the percentage of a number or determine what percentage one number is of another.
It simplifies calculations involving percentages, making them faster and more accurate.
How to Use the Percentage Calculator?
Given below is a step-by-step process on how to use the calculator:
Step 1: Enter the values: Input the numbers you wish to calculate the percentage for into the given fields.
Step 2: Click on calculate: Click on the calculate button to compute the result.
Step 3: View the result: The calculator will display the result instantly.
How to Calculate Percentages?
To calculate percentage, there is a simple formula that the calculator uses.
The formula to find the percentage of a number is: Percentage = (Part/Whole) × 100 This formula helps in converting a fraction into a percentage.
By multiplying the ratio of the part to the whole by 100, you get the percentage.
Tips and Tricks for Using the Percentage Calculator
When using a percentage calculator, there are a few tips and tricks that can make it easier and help avoid mistakes:
- Understand the context of your calculation to ensure accuracy.
- Double-check your input values to prevent errors.
- Use the calculator for quick estimations, and verify with manual calculations if needed.
Common Mistakes and How to Avoid Them When Using the Percentage Calculator
Even when using a calculator, mistakes can occur. Here are some common errors and how to prevent them:
Mistake 1
Misplacing the Part and Whole Values
Ensure that you correctly identify which number is the part and which is the whole.
Swapping these values will lead to incorrect results.
Mistake 2
Rounding Too Early
Avoid rounding numbers too early in the calculation process.
Wait until the final result before rounding to ensure accuracy.
Mistake 3
Confusing Percentage Increase with Percentage Proportion
Make sure you understand the difference between finding a percentage increase and calculating a percentage of a total.
These are different operations and require different formulas.
Mistake 4
Forgetting to Multiply by 100
When calculating percentages, remember to multiply by 100.
This step is often forgotten, leading to incorrect results.
Mistake 5
Relying on the Calculator for All Scenarios
While calculators are helpful, they may not account for specific scenarios such as compounded percentages.
It’s important to understand the underlying math for complex calculations.
Percentage Calculator Examples
Problem 1
What is 20% of 150?
Use the formula: Percentage = (Part/Whole) × 100 Let Part = 20% of 150 Part = (20/100) × 150 = 30 So, 20% of 150 is 30.
Explanation
By multiplying 20% (0.20) by 150, the result is 30, which represents 20% of the total.
Problem 2
You scored 85 out of 100 on a test. What percentage did you score?
Use the formula: Percentage = (Part/Whole) × 100 Percentage = (85/100) × 100 = 85% So, you scored 85%.
Explanation
The calculation shows that scoring 85 out of 100 is equivalent to 85%.
Problem 3
A product's price increased from $50 to $65. What is the percentage increase?
Use the formula for percentage increase: Percentage Increase = [(New Value - Old Value)/Old Value] × 100 Percentage Increase = [(65 - 50)/50] × 100 = 30% The price increased by 30%.
Explanation
The difference of $15 between the new and old prices, divided by the old price, gives a 30% increase.
Problem 4
What percentage of 200 is 50?
Use the formula: Percentage = (Part/Whole) × 100 Percentage = (50/200) × 100 = 25% So, 50 is 25% of 200.
Explanation
Dividing 50 by 200 and multiplying by 100 gives 25%, showing that 50 is 25% of 200.
Problem 5
A quantity decreased from 120 to 96. What is the percentage decrease?
Use the formula for percentage decrease:
Percentage Decrease = [(Old Value - New Value)/Old Value] × 100
Percentage Decrease = [(120 - 96)/120] × 100 ≈ 20% The quantity decreased by approximately 20%.
Explanation
The reduction of 24, divided by the original 120, results in a 20% decrease.
FAQs on Using the Percentage Calculator
1.How do you calculate a percentage?
2.What is the formula for percentage increase?
3.Can a percentage be greater than 100?
4.How do I find what percentage one number is of another?
5.Is the percentage calculator always accurate?
Glossary of Terms for the Percentage Calculator
- Percentage: A fraction or ratio expressed as part of 100. For example, 50% is 50 out of 100.
- Percentage Increase: The amount of increase expressed as a percentage of the original value.
- Percentage Decrease: The amount of decrease expressed as a percentage of the original value.
- Part and Whole: 'Part' refers to the portion of the total, while 'Whole' is the total amount.
- Rounding: Approximating a number to a specified degree of accuracy, often used in percentage calculations.
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Seyed Ali Fathima S
About the Author
Seyed Ali Fathima S a math expert with nearly 5 years of experience as a math teacher. From an engineer to a math teacher, shows her passion for math and teaching. She is a calculator queen, who loves tables and she turns tables to puzzles and songs.
Fun Fact
: She has songs for each table which helps her to remember the tables
