Percentage Calculator Online Free — Marks, Discount & More

Q: How to calculate discount percentage?

Original price ₹2000, discount 25% means you save ₹500 (2000 × 25/100). Final price = ₹1500.

Percentages come up everywhere — exam results, shopping discounts, salary increases, GST calculations, and bank interest. This guide explains the four most common percentage calculations with formulas, examples, and a free online calculator.

1. Marks Percentage Calculator

The most common need for Indian students — calculating your overall percentage from marks obtained.

Formula: Marks % = (Marks Obtained ÷ Total Marks) × 100

Example:
Marks obtained: 385 | Total marks: 500
Percentage = (385 ÷ 500) × 100 = 77%

Grade and Division Reference (Indian Board Exams)

Percentage RangeGrade / Division

90% and aboveA+ / Distinction

75% – 89%First Division

60% – 74%Second Division

45% – 59%Third Division

Below 45%Fail (varies by board)

Note: Passing percentage varies by board and subject. Always check your specific board's rules.

2. Percentage Increase / Decrease

Used to calculate salary hikes, price changes, or population growth.

% Increase: ((New Value - Old Value) ÷ Old Value) × 100
% Decrease: ((Old Value - New Value) ÷ Old Value) × 100

Salary example:
Old salary: ₹25,000 | New salary: ₹30,000
Increase % = ((30,000 - 25,000) ÷ 25,000) × 100 = 20% hike

Price drop example:
Old price: ₹1,200 | New price: ₹900
Decrease % = ((1,200 - 900) ÷ 1,200) × 100 = 25% decrease

3. Discount Calculator

Used for shopping — find the final price after a discount percentage.

Discount Amount: Original Price × (Discount % ÷ 100)
Final Price: Original Price - Discount Amount

Shopping example:
Original price: ₹2,000 | Discount: 25%
Discount amount = 2,000 × 25/100 = ₹500
Final price = 2,000 - 500 = ₹1,500

Online Shopping Tip: Many sites show "upto X% off" but the actual discount per item may be less. Always verify: Final Price = Original Price × (1 - Discount%/100).

4. What is X% of Y?

The most basic percentage question — used for GST, interest, and everyday calculations.

Formula: Result = (X ÷ 100) × Y

Example 1 — GST: What is 18% of ₹10,000?
= (18 ÷ 100) × 10,000 = ₹1,800 (GST amount)

Example 2 — Commission: What is 5% of ₹85,000 (annual salary)?
= (5 ÷ 100) × 85,000 = ₹4,250 (commission)

Common Percentage Calculations for Indian Students

Situation	What to calculate	Formula used
Board exam result	Overall % from marks	Marks % = Obtained ÷ Total × 100
CGPA to percentage	Approx. percentage from CGPA	% ≈ CGPA × 9.5 (CBSE formula)
Salary hike in job offer	% increase from current CTC	Hike % = (New-Old) ÷ Old × 100
Discount on Amazon/Flipkart	Amount saved + final price	Savings = Price × Discount% ÷ 100
GST on purchase	Tax amount on invoice	GST = Price × Rate% ÷ 100

Frequently Asked Questions

How to calculate marks percentage?

Divide marks obtained by total marks and multiply by 100. Example: 385 out of 500 = (385/500) × 100 = 77%.

How to calculate percentage increase?

Subtract old value from new value, divide by old value, multiply by 100. Example: price went from ₹200 to ₹250 = ((250−200)/200) × 100 = 25% increase.

What is CGPA to percentage conversion?

For CBSE: Percentage = CGPA × 9.5. So CGPA 8.5 = approximately 80.75%. For university students, check your specific institution's conversion chart as formulas vary.

How to calculate percentage with GST?

For a simple GST calculation, use our GST Calculator which shows CGST and SGST split automatically. For manual: GST Amount = Price × Rate ÷ 100.

How to calculate discount percentage from original and sale price?

Discount % = ((Original Price - Sale Price) ÷ Original Price) × 100. Example: Original ₹500, Sale ₹350 → Discount % = ((500-350)/500) × 100 = 30%.

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Percentage Calculator — Marks, Discount, Increase & Decrease