Percentage Calculator - Calculate Marks Percentage

What is X% of Y?

Formula: Result = (X ÷ 100) × Y

% of

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X is what % of Y?

Formula: Result = (X ÷ Y) × 100

is what % of

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Percentage Change

Formula: ((New − Old) ÷ Old) × 100

From to

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Increase a Value by %

Formula: Value × (1 + Percent ÷ 100)

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Decrease a Value by %

Formula: Value × (1 − Percent ÷ 100)

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Percentage Difference

Formula: |A − B| ÷ ((A + B) ÷ 2) × 100

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How to Calculate Percentage?

Percentage is a way to express a number as a fraction of 100. The word "percent" comes from the Latin "per centum" meaning "by the hundred."

Basic Percentage Formula

Percentage = (Part ÷ Whole) × 100

Example: If 30 students passed out of 50, the pass percentage = (30 ÷ 50) × 100 = 60%.

Percentage Change Formula

To find how much a value has increased or decreased: % Change = ((New Value − Old Value) ÷ Old Value) × 100. A positive result = increase, negative = decrease.

Uses of Percentage in Daily Life

Percentages are used everywhere — in exam scores, discounts and offers, interest rates on loans, tax calculations, nutrition labels on food, and statistical data in news reports. Understanding percentage calculations is a fundamental life skill.

Frequently Asked Questions

How to calculate percentage of marks?

Percentage = (Marks Obtained ÷ Total Marks) × 100. Example: You scored 450 out of 600 → (450 ÷ 600) × 100 = 75%. Use our Grade Calculator for instant results.

How to calculate percentage increase or decrease?

% Change = ((New Value − Old Value) ÷ Old Value) × 100. Positive = increase, Negative = decrease. Use the "Percentage Change" calculator above.

What is percentage difference?

Percentage Difference = |A − B| ÷ ((A + B) ÷ 2) × 100. It compares two values without a defined reference direction. Use our "Percentage Difference" calculator above.

How to calculate 18% GST on a price?

GST Amount = Price × (18 ÷ 100) = Price × 0.18. Then Total = Price + GST Amount. Or use our dedicated GST Calculator which handles all GST slabs automatically.

Other Useful Calculators

Percentage calculations are used everywhere — from exam scores to discounts. Use our Grade Calculator to convert percentage to letter grades (A/B/C). For GST percentage calculations, try our GST Calculator India. To understand loan interest percentage, use our EMI Loan Calculator.

% Percentage Calculator