Percentage Calculator 2026 | Calculate Percentage, Increase, Decrease Online

Calculate percentage of any number instantly with our free percentage calculator. Find what percentage one number is of another, calculate percentage increase or decrease, add or subtract percentage from numbers. Essential tool for students calculating exam marks percentage, shoppers finding discount amounts, businesses calculating profit margins, professionals working with statistics and data analysis. The calculator shows both the percentage result and the remaining value. Perfect for everyday math including tip calculations, tax computations, grade point averages, and financial planning. Simple, accurate, and works for all percentage calculation needs whether for academics, shopping, business, or personal finance.

Common Percentage Formulas

Basic Percentage

Percentage = (Part / Whole) × 100

Example:
What % is 25 of 200?
= (25 / 200) × 100
= 12.50%

Percentage Of

Result = (Number × Percentage) / 100

Example:
20% of 500?
= (500 × 20) / 100
= 100.00

Percentage Increase

Increase = [(New - Old) / Old] × 100

Example:
₹100.00 to ₹120.00
= [(120-100) / 100] × 100
= 20.00% increase

Percentage Decrease

Decrease = [(Old - New) / Old] × 100

Example:
₹200.00 to ₹150.00
= [(200-150) / 200] × 100
= 25.00% decrease

Percentage Quick Reference Table

Percentage	Decimal	Fraction	Quick Calculation
10%	0.10	1/10	Divide by 10
20%	0.20	1/5	Divide by 5
25%	0.25	1/4	Divide by 4
33.33%	0.33	1/3	Divide by 3
50%	0.50	1/2	Divide by 2
75%	0.75	3/4	Multiply by 0.75
100%	1.00	1/1	Same number

Real-World Percentage Applications

Shopping & Discounts

30% off on ₹2000:
Discount = 2000 × 0.30 = ₹600.00
Final = ₹1,400.00
Buy 2 Get 1 Free:
Effective discount = 33.33%
Cashback 10% up to ₹200:
On ₹3000, get ₹200.00 (6.67% effective)

Education & Marks

450 marks out of 600:
(450/600) × 100 = 75.00%
Need 60% to pass (500 total):
Required = 500 × 0.60 = 300.00 marks
CGPA 8.5 to percentage:
8.5 × 9.5 = 80.75% approx

Finance & Tax

18% GST on ₹10,000:
Tax = 10000 × 0.18 = ₹1,800.00
Total = ₹11,800.00
10% salary hike on ₹50,000:
New = 50000 × 1.10 = ₹55,000.00
20% profit margin:
If profit = ₹400.00, SP = 400/0.20 = ₹2,000.00

Health & Nutrition

Lost 5kg from 80kg:
(5/80) × 100 = 6.25% weight loss
Daily calorie goal 2000, ate 1500:
(1500/2000) × 100 = 75.00% achieved
Body fat 20% of 70kg:
70 × 0.20 = 14.00kg fat

Step-by-Step Percentage Examples

Example 1: Calculate 15% of 2,500

• Given: Value = 2,500, Percentage = 15%
• Formula: (Value × Percentage) / 100
• Calculation:
= (2,500 × 15) / 100
= 37,500 / 100
• Result: 375.00
• Remaining: 2,500 - 375 = 2,125.00

Example 2: What % is 150 of 600?

• Given: Part = 150, Whole = 600
• Formula: (Part / Whole) × 100
• Calculation:
= (150 / 600) × 100
= 0.25 × 100
• Result: 25.00%

Example 3: Percentage Increase from 800 to 1,000

• Given: Old Value = 800, New Value = 1,000
• Formula: [(New - Old) / Old] × 100
• Calculation:
= [(1,000 - 800) / 800] × 100
= (200 / 800) × 100
= 0.25 × 100
• Result: 25.00% increase

Percentage Calculation Tips & Tricks

Finding 10%: Just move decimal one place left. 10% of 350 = 35.0
Finding 1%: Move decimal two places left. 1% of 2500 = 25.00
Finding 5%: Find 10% and divide by 2. 5% of 800 = 80 ÷ 2 = 40.00
Finding 15%: Add 10% + 5%. 15% of 600 = 60 + 30 = 90.00
Finding 20%: Find 10% and double it. 20% of 450 = 45 × 2 = 90.00
Finding 25%: Divide by 4. 25% of 200 = 200 ÷ 4 = 50.00
Finding 50%: Divide by 2. 50% of 180 = 180 ÷ 2 = 90.00
Finding 75%: Find 50% + 25%. 75% of 400 = 200 + 100 = 300.00
Successive Discounts: 20% then 10% ≠ 30%. After 20% off ₹100 = ₹80, then 10% off ₹80 = ₹72.00 (28% total discount, not 30%)
Reverse Percentage: If after 20% discount price is ₹800, original = 800 ÷ 0.80 = ₹1,000.00

Common Percentage Mistakes to Avoid

Critical Errors

Mistake 1: Adding Percentages Directly
Wrong: 10% discount + 20% discount = 30% discount
Correct: After 10% off ₹100 = ₹90, then 20% off ₹90 = ₹72 (28% total)
Mistake 2: Using Wrong Base
Wrong: Increased from ₹100 to ₹150 = 50% up, so decrease back is 50% of ₹150 = ₹75
Correct: To get back to ₹100 from ₹150, decrease = (50/150) × 100 = 33.33%
Mistake 3: Percentage OF vs Percentage IS
Wrong: Confusing "20% of 500" with "20 is what % of 500"
Correct: 20% of 500 = 100.00 | 20 is 4% of 500
Mistake 4: Forgetting to Divide by 100
Wrong: 15% of 200 = 200 × 15 = 3,000
Correct: 15% of 200 = (200 × 15) / 100 = 30.00

Percentage in Different Fields

Field	Common Use	Example
Retail	Discounts, markup, profit margin	30% off, 40% markup
Finance	Interest rates, returns, tax	8% interest, 18% GST
Education	Grades, attendance, scores	75% marks, 90% attendance
Statistics	Growth rate, change analysis	15% growth, 5% decline
Health	Body composition, nutrition	20% body fat, 80% water
Business	Commission, profit, loss	10% commission, 25% profit

Percentage Calculator 2026 - Calculate Percentage Online Free

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