What is X% of Y?
X is what % of Y?
Percentage Increase
Percentage Decrease
Percentage Calculator – Calculate Percentages, Increase and Decrease
A percentage is a simple way to express a number as a part of 100. It is commonly used to calculate exam marks, discounts, price changes, business profits, salary increases, and many other everyday values. The Calculator Heart Percentage Calculator helps you solve these calculations quickly without working through the formulas manually.
This free online percentage calculator includes four useful calculation options. You can find a percentage of any number, calculate what percentage one number represents of another, measure percentage increases, and calculate percentage decreases. Enter your values in the relevant fields, select Calculate, and view the result instantly.
What You Can Calculate With This Percentage Calculator
1. Calculate What Is X% of Y
Use this option when you know the percentage and the original number and want to find the result.
Formula
Percentage Value = (Percentage ÷ 100) × Number
Example
Suppose you want to calculate 20% of 500.
Percentage = 20
Number = 500
Result = 100
Enter 20 in the Percentage field and 500 in the Number field. The calculator returns 100.
This calculation is useful for finding a portion of a total, working out a percentage of exam marks, or calculating a specific share of a quantity.
2. Calculate What Percentage X Is of Y
Use this option when you have two numbers and want to know how much the first number represents as a percentage of the second.
Formula
Percentage = (X ÷ Y) × 100
Example
A student scores 360 marks out of 450. To calculate the percentage, enter 360 as X and 450 as Y.
Obtained marks = 360
Total marks = 450
Percentage = 80%
This method is useful for calculating examination results, attendance percentages, sales targets, completion rates, and other comparisons between a part and a total.
The total value must not be zero because division by zero cannot produce a valid percentage.
3. Calculate Percentage Increase
The percentage increase calculator shows how much a value has increased compared with its original value.
Formula
Percentage Increase = ((New Value − Original Value) ÷ Original Value) × 100
Example
Suppose the price of a product increases from ₹800 to ₹1,000.
Original value = 800
New value = 1,000
Increase = 200
Percentage increase = 25%
Enter 800 as the Original Value and 1,000 as the New Value. The result is 25%.
You can use this calculation to compare salary increases, rising product prices, business revenue, monthly expenses, or changes in sales.
If the new value is lower than the original value, the formula produces a negative percentage, indicating a decrease rather than an increase.
4. Calculate Percentage Decrease
Use the percentage decrease calculator to find how much a value has fallen compared with its original value.
Formula
Percentage Decrease = ((Original Value − New Value) ÷ Original Value) × 100
Example
A product’s price drops from ₹1,500 to ₹1,200.
Original value = 1,500
New value = 1,200
Decrease = 300
Percentage decrease = 20%
Enter 1,500 as the Original Value and 1,200 as the New Value. The calculator returns 20%.
This method is useful for tracking price reductions, lower expenses, reduced sales, falling quantities, and other changes over time.
If the new value is greater than the original value, the result becomes negative, indicating an increase instead of a decrease.
How to Use the Online Percentage Calculator
Follow these simple steps to calculate your percentage.
Open the Percentage Calculator on Calculator Heart.
Choose the calculation section that matches your requirement.
Enter the required numbers in the input fields.
Select the Calculate button below the fields.
Read the result displayed in the result box.
Use Reset All to clear the entered values and start another calculation.
Each calculation section works independently, so you can calculate different percentages without resetting the entire calculator every time.
Percentage Calculation Formulas at a Glance
| Calculation | Formula |
|---|---|
| X% of Y | (X ÷ 100) × Y |
| X is what percentage of Y | (X ÷ Y) × 100 |
| Percentage increase | ((New − Original) ÷ Original) × 100 |
| Percentage decrease | ((Original − New) ÷ Original) × 100 |
These formulas work with whole numbers and decimal values. For calculations involving negative values or unusual data, interpret the result according to the meaning of the original and new values.
Practical Uses of a Percentage Calculator
Percentages are used in education, shopping, finance, business, and daily planning. This calculator can help with common tasks such as:
Exam marks: Find the percentage obtained from total and scored marks.
Shopping: Work out a percentage-based price reduction or change.
Salary comparison: Calculate the percentage increase between two salaries.
Business performance: Compare revenue, sales, expenses, or targets.
Attendance: Calculate the proportion of classes attended out of the total.
Progress tracking: Measure changes in scores, completed tasks, or other quantities.
Budget planning: Compare changes in spending across different periods.
For example, if monthly expenses rise from 12,000 to 13,500, the percentage increase is 12.5%. This makes it easier to compare the change instead of looking only at the difference in amounts.
Benefits of Using Calculator Heart Percentage Calculator
The Calculator Heart Percentage Calculator brings four common percentage calculations together in one convenient tool.
Free to use: Perform percentage calculations without paying for a calculator.
Four calculation options: Handle percentage values, percentage comparisons, increases, and decreases.
Quick results: Calculate values without manually applying formulas.
Decimal support: Enter decimal numbers when your calculation requires them.
Easy to understand: Each section has clearly labelled fields and its own Calculate button.
Mobile-friendly layout: Use the calculator on compatible smartphones, tablets, laptops, and desktop computers.
Reset option: Clear all input fields and restore the displayed results to their initial values.
The calculator formats displayed numbers with commas where appropriate and shows up to two decimal places. This makes many results easier to read, although the displayed result may be rounded to two decimal places.
Important Things to Remember When Calculating Percentages
A percentage always depends on the value used as the reference. For percentage increases and decreases, the original value is the reference point. Changing that reference can change the result.
For example, an increase from 100 to 150 is 50%, but a decrease from 150 to 100 is approximately 33.33%. The numerical difference is the same, but the original values are different.
The original value must not be zero for the percentage increase and decrease calculations in this tool. Similarly, the second number in the X is what percentage of Y calculation must not be zero.
For financial calculations, remember that a percentage change is not necessarily the same as a fixed amount. Always check the original value, the new value, and the purpose of the calculation before using the result.
Calculate Percentages Online With Ease
Whether you need to calculate exam results, compare two numbers, find a percentage of a total, or measure a price increase or decrease, the Calculator Heart Percentage Calculator provides a simple way to get the answer. Enter your values in the appropriate section, calculate the result, and use Reset All whenever you want to begin again.
Use this free online tool whenever you need a quick percentage calculation for study, work, shopping, or everyday tasks.