Percentage Calculator
All calculators update instantly as you type — no button press needed.
Find Percentage Value
What is X% of a given number?
Find Percentage Rate
X is what percent of Y?
Marks Percentage Calculator
Enter scored marks and total marks to find your percentage and grade.
What is the Percentage Calculator?
The Percentage Calculator is a versatile free online tool that handles the three most common percentage problems in a single page. Whether you need to find what a certain percentage of a number is, determine what percentage one number represents of another, or calculate your marks percentage from scored and total marks — this calculator covers all three scenarios with instant real-time results. Percentage calculations are used daily in academic contexts (exam results, grade computation), financial situations (discounts, interest, GST), and business analysis (profit margins, growth rates). Our calculator is designed for students, teachers, shop owners, finance professionals, and anyone who needs quick and accurate percentage computations without manual effort.
How to Use the Percentage Calculator
- 1. Find % Value: Enter the percentage (e.g. 25) and the number (e.g. 80) to get the result (20).
- 2. Find % Rate: Enter the part value and the total value to find what percentage the part is of the total.
- 3. Marks %: Enter the marks you scored and the total marks to see your percentage and grade.
- 4. All three sections update in real time as you type — no button press required.
Percentage Formulas Reference
Value from %
Result = (P ÷ 100) × N
P = percentage, N = number
Rate from Values
% = (A ÷ B) × 100
A = part, B = total
Marks %
% = (Scored ÷ Total) × 100
Standard academic formula
Practical Example
Example 1: What is 25% of 80? Result = (25 × 80) / 100
= 20.
Example 2: 45 is what percent of 180?
Percentage = (45 / 180) × 100 = 25%.
Example 3: A
student scored 420 out of 700 marks. Marks % = (420 / 700) × 100 = 60%
(Grade C). These examples illustrate the immediate practical utility of all three sections
of this calculator.
Why Use Our Percentage Calculator?
- • Three calculators in one page — find %, find rate, and marks % all without switching tabs.
- • Live step-by-step solution shown for each calculation to help you understand the working.
- • Visual progress bar shows the relative proportion for better intuitive understanding.
- • Completely free, works on all devices, no ads interrupting your calculation flow.
Frequently Asked Questions
How do I calculate the percentage of a number?
Multiply the number by the percentage value and divide by 100. Formula: Result = (Percentage × Number) / 100. For example, 25% of 80 = (25 × 80) / 100 = 20.
How do I calculate percentage increase?
Percentage increase = ((New Value - Old Value) / Old Value) × 100. If a price rises from ₹500 to ₹600, the percentage increase = (100 / 500) × 100 = 20%. A negative result indicates a percentage decrease.
How do I find what percentage one number is of another?
Divide the part by the whole and multiply by 100. Formula: Percentage = (A / B) × 100. For example, 45 is what % of 180? = (45 / 180) × 100 = 25%.
How do I calculate marks percentage?
Divide your scored marks by the total marks and multiply by 100. Formula: Marks % = (Scored / Total) × 100. For example, 420 out of 700 = (420/700) × 100 = 60%. This method applies to board exams, competitive exams, and university assessments.