Percentage Calculator

Percentage Calculator — All Types

A percentage calculator is one of the most useful everyday math tools. Whether you are a student calculating exam scores, a shopper figuring out discounts, a business owner analyzing growth, or a professional working with financial data, percentages are everywhere. Our free online percentage calculator handles all common percentage calculations instantly — no login, no ads, no limits.

This tool supports five different calculation modes: finding a percentage of a number, determining what percentage one number is of another, calculating percentage increase or decrease between two values, converting marks to percentage, and converting CGPA to percentage across multiple grading scales. Simply select the mode you need, enter your values, and get the result immediately.

How to Calculate Percentage

The basic percentage formula is straightforward: Percentage = (Part / Whole) × 100. This formula is the foundation for all percentage calculations. For example, if you scored 45 marks out of 60, the percentage is (45 ÷ 60) × 100 = 75%. Similarly, if a product costs ₹800 after a discount on the original price of ₹1,000, the discount percentage is ((1000 - 800) / 1000) × 100 = 20%.

To find a percentage of a number, multiply the number by the percentage and divide by 100. For instance, 15% of 800 = (15 × 800) / 100 = 120. This is commonly used for calculating discounts, tips, tax amounts, and commissions. Our calculator handles all these scenarios with a single click.

Percentage Increase and Decrease

Percentage change measures how much a value has increased or decreased relative to its original amount. The formula is: Percentage Change = ((New Value - Old Value) / Old Value) × 100. A positive result indicates an increase, while a negative result indicates a decrease.

Example — Percentage Increase: If rent increases from ₹10,000 to ₹12,000, the increase is ((12,000 - 10,000) / 10,000) × 100 = 20%. This means rent went up by 20%.

Example — Percentage Decrease: If a product's price drops from ₹500 to ₹350, the decrease is ((350 - 500) / 500) × 100 = -30%. This means the price dropped by 30%.

Percentage change is widely used in finance (stock price movements), business (revenue growth), academics (grade improvements), and everyday life (sale prices, inflation rates). Our calculator shows both the percentage change and whether it is an increase or decrease.

CGPA to Percentage Conversion

Many universities and employers require percentage scores even when grades are given in CGPA (Cumulative Grade Point Average). The conversion formula varies by grading scale:

The 10.0 scale formula (CGPA × 9.5) is the most commonly used in Indian universities and is recommended by CBSE. The 4.0 scale is standard in the US grading system, while the 5.0 scale is used by some institutions. Always verify which formula your institution or employer accepts before converting.

Marks Percentage Calculator

Students frequently need to calculate their exam percentage from total and obtained marks. The formula is simple: Percentage = (Obtained Marks / Total Marks) × 100. For example, if you scored 425 out of 500, your percentage is (425 / 500) × 100 = 85%.

This marks percentage calculator is useful for board exam results (CBSE, ICSE, state boards), competitive exam scores, semester results, and entrance test scores. Many scholarship programs and job applications require percentage scores rather than CGPA or grades, making this calculation essential for students across India.

You can also use this to calculate aggregate percentages across multiple subjects or semesters by adding up all obtained marks and all total marks, then applying the formula. For instance, if you have five subjects each out of 100 and scored 85, 78, 92, 88, and 76, your aggregate percentage is (85 + 78 + 92 + 88 + 76) / 500 × 100 = 83.8%.