Percentage Calculator

What is X% of Y?

Percentage (X)

Total Amount (Y)

X is what % of Y?

Part (X)

Whole (Y)

Percentage Change

Old Value

New Value

Discount Calculator

Original Price

₹

Discount %

Result

15% of 200 is equal to 30.

Percentage Share

15%

30 is 15% of 200.

% Change

+25.0%

Difference25

TypeIncrease ↑

Final Price

₹960

Original₹1,200

You Save₹240

What Can You Calculate?

Percentage of a Number

Find X% of any number. For example, discover what a 15% tip or 18% tax comes to on your purchase subtotal.

What Percent One Number Is of Another

Find the percentage relationship between two numbers, such as calculating exam scores or budget allocations.

Percentage Increase or Decrease

Compare an original value with a new value to calculate the percentage change, growth rate, or price drop.

How to Calculate a Percentage

How to Find a Percentage of a Number

To find a percentage of any number, divide the percentage rate by 100 to convert it into a decimal, then multiply by the total number:

            Percentage = (Percent ÷ 100) × Number
          

Example: Find 20% of 150.
20% of 150 = (20 ÷ 100) × 150 = 0.20 × 150 = 30

How to Find What Percent One Number Is of Another

To find what percentage one number (the part) represents of another number (the whole), divide the part by the whole and multiply by 100:

            Percentage = (Part ÷ Whole) × 100
          

Example: 30 is what percent of 150?
(30 ÷ 150) × 100 = 0.20 × 100 = 20%

How to Calculate Percentage Increase or Decrease

To calculate the percentage change between an original value and a new value, subtract the original value from the new value, divide the difference by the original value, and multiply by 100:

            Percentage Change = ((New Value − Original Value) ÷ Original Value) × 100
          

Example: Calculate the percentage change from 80 to 100:
((100 − 80) ÷ 80) × 100 = (20 ÷ 80) × 100 = 0.25 × 100 = 25% increase.
(If the resulting percentage is negative, it indicates a percentage decrease).

Need in-depth formulas, comparison breakdowns, and step-by-step examples? Read our complete guides on How to Calculate Percentage Change and Percentage Increase and Decrease.

Common Uses for Percentage Calculations

Percentages are an essential mathematical tool for personal finance, professional metrics, and academic tracking. Common everyday situations include:

Discounts and sale prices: Working out how much you save during retail sales, promotional markdowns, or store clearance events.

Exam scores: Converting raw points on homework, quizzes, and final exams into standard percentage grades.

Tax and tips: Calculating restaurant gratuity, service charges, or applicable state and local sales tax on purchase bills.

Business growth: Measuring quarterly revenue gains, user acquisition trends, and organizational KPI progress.

Price increases and decreases: Tracking price inflation, supplier rate changes, or promotional price reductions over time.

Completion rates: Measuring milestone progress on fitness targets, project schedules, and learning course goals.

Frequently Asked Questions

How do I calculate a percentage of a number?

Convert the percentage into a decimal by dividing it by 100, then multiply by the total number. For example, to find 15% of 200: (15 ÷ 100) × 200 = 30.

How do I find what percentage one number is of another?

Divide the part by the whole number, then multiply the result by 100. For example, if you scored 45 out of 60 on a test: (45 ÷ 60) × 100 = 75%.

How do I calculate percentage increase?

Subtract the original value from the new value, divide the difference by the original value, and multiply by 100. For example, from 50 to 65: ((65 − 50) ÷ 50) × 100 = 30% increase.

How do I calculate percentage decrease?

Subtract the new value from the original value, divide that difference by the original value, and multiply by 100. For example, from 80 down to 60: ((80 − 60) ÷ 80) × 100 = 25% decrease.

What is the difference between percentage change and percentage difference?

Percentage change measures how much a single quantity has increased or decreased relative to its own previous or original value over time. Percentage difference compares two distinct numbers when neither is considered the baseline or "original," typically calculated by dividing the absolute difference by the average of the two numbers.