📜 History
🧾 Smart GST Calculator
Add or remove GST from any amount instantly
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Result
⚖️ Compare Two Deals
Find out which shopping deal saves you more money!
Deal 1
Deal 2
🇮🇳 Common Uses in India
From shopping discounts to GST calculations – we’ve got you covered for all Indian scenarios
Shopping Discounts
Calculate savings during Flipkart, Amazon, or Big Bazaar sales. Know exactly how much you save!
MRP: ₹5,000
Discount: 40% off
You Pay: ₹3,000
Save: ₹2,000!
GST Calculations
Calculate GST on your bills. Know pre-GST and post-GST prices instantly.
Product: ₹1,000
GST (18%): ₹180
Total Bill: ₹1,180
Salary Hike %
Calculate your salary increment percentage during appraisals.
Old: ₹50,000/month
New: ₹60,000/month
Hike: 20% increase 🎉
Exam Percentage
Calculate marks percentage for CBSE, ICSE, or university exams.
Scored: 450 marks
Total: 500 marks
Percentage: 90% 🏆
Investment Returns
Calculate returns on stocks, mutual funds, or FDs.
Invested: ₹1,00,000
Current: ₹1,25,000
Return: 25% gain 📈
Restaurant Tips
Calculate tips at restaurants (10%, 15%, or 20%).
Bill: ₹2,000
Tip (10%): ₹200
Total: ₹2,200
📝 3 Real Indian Examples
Step-by-step calculations from everyday Indian life
Example 1: Diwali Shopping at Big Bazaar
Calculating savings during festive sale
🎯 Scenario:
Priya is shopping during Diwali sale at Big Bazaar. She wants to buy a TV with MRP ₹50,000. The store is offering 35% discount. How much will she save?
📊 Calculation Steps:
- Original Price: ₹50,000
- Discount: 35%
- Formula: (35 ÷ 100) × 50,000
- Discount Amount: ₹17,500
- Final Price: ₹50,000 – ₹17,500 = ₹32,500
✅ Result
Priya pays ₹32,500 and saves ₹17,500 (35% off)
Example 2: Restaurant Bill with GST
Understanding your restaurant bill
🎯 Scenario:
Rajesh had dinner at a restaurant. Food cost is ₹2,500 (before GST). The restaurant charges 5% GST. What’s the total bill?
📊 Calculation Steps:
- Food Cost: ₹2,500
- GST Rate: 5%
- Formula: (5 ÷ 100) × 2,500
- GST Amount: ₹125
- Total Bill: ₹2,500 + ₹125 = ₹2,625
✅ Result
Total bill = ₹2,625 (Food ₹2,500 + GST ₹125)
Example 3: Annual Salary Appraisal
Calculating hike percentage
🎯 Scenario:
Amit’s current salary is ₹8,00,000/year. After appraisal, his new salary is ₹9,60,000/year. What’s his hike percentage?
📊 Calculation Steps:
- Old Salary: ₹8,00,000
- New Salary: ₹9,60,000
- Increase: ₹9,60,000 – ₹8,00,000 = ₹1,60,000
- Formula: (1,60,000 ÷ 8,00,000) × 100
- Hike %: 20%
✅ Result
Amit got 20% salary hike (₹1,60,000 increase annually)
🔢 How Percentages are Calculated
1️⃣ What is X% of Y?
Most common calculation – finding a percentage of a number.
Example: 20% of 500 = (20 ÷ 100) × 500 = 100
2️⃣ X is what % of Y?
Finding what percentage one number is of another.
Example: 100 is what % of 500 = (100 ÷ 500) × 100 = 20%
3️⃣ Percentage Change (Increase/Decrease)
Measuring change between old and new values.
Example: From 100 to 150 = ((150-100) ÷ 100) × 100 = 50% increase
💡 5 Pro Tips for Percentage Calculations
Master these tricks to calculate percentages faster in your daily life
Quick 10% Trick
To find 10% of any number, just move the decimal point one place left. Example: 10% of ₹2,500 = ₹250. Then multiply for other percentages: 20% = ₹250 × 2 = ₹500.
GST Reverse Calculation
To find original price before GST: Divide total by (1 + GST%). For 18% GST: Original = Total ÷ 1.18. Example: Bill is ₹1,180 → Original price = ₹1,180 ÷ 1.18 = ₹1,000.
Discount Stacking Reality
Important: “50% + 20% off” ≠ 70% off! It’s 50% first, then 20% on remaining. Example: ₹1,000 item → 50% off = ₹500 → then 20% off = ₹400 final price (60% total discount, not 70%).
Shopping Smart Tip
During sales, calculate actual discount: If MRP is inflated, real discount is less. Formula: Real Discount = ((MRP – Selling Price) ÷ Actual Market Price) × 100. Always compare with normal market prices!
Percentage vs Percentage Points
Don’t confuse! If interest rate increases from 5% to 6%, that’s a 1 percentage point increase, but 20% percentage increase [(6-5)/5 × 100]. Banks use this confusion in marketing!
❓ Frequently Asked Questions
Everything you need to know about percentage calculations
How do you calculate a percentage? ▼
To find a percentage of a number, convert the percentage to a decimal and multiply. Formula: (Percentage ÷ 100) × Total Number. Example: 20% of 500 = (20 ÷ 100) × 500 = 100.
What is the formula for percentage change? ▼
Formula for percentage change: ((New Value – Old Value) ÷ Old Value) × 100. Positive result = percentage increase, negative = percentage decrease. Example: From ₹100 to ₹150 = ((150-100) ÷ 100) × 100 = 50% increase.
How to calculate GST percentage in India? ▼
To calculate GST: Multiply product price by GST rate (18%, 12%, 5%, or 28%) divided by 100. Example: Product ₹1,000 with 18% GST = ₹1,000 × (18 ÷ 100) = ₹180 GST. Total = ₹1,180.
How to calculate discount percentage during sales? ▼
Discount % = ((Original Price – Sale Price) ÷ Original Price) × 100. Example: Shirt was ₹2,000, now ₹1,200. Discount = ((2000-1200) ÷ 2000) × 100 = 40% off.
How to calculate marks percentage for exams? ▼
Marks Percentage = (Marks Obtained ÷ Total Marks) × 100. Example: Scored 450 out of 500 = (450 ÷ 500) × 100 = 90%.
How is this calculator useful in daily life? ▼
Percentage calculations are used everywhere: calculating discounts at stores, figuring out GST on bills, calculating tips at restaurants, understanding salary hikes, exam results, investment returns, EMI calculations, and analyzing price changes.
What’s the difference between 50% off and buy 1 get 1 free? ▼
They’re the same! Buy 1 get 1 free (BOGO) = 50% off total. If each item is ₹100, BOGO means ₹200 for 2 items = ₹100 per item = 50% off. But BOGO forces you to buy 2 items, while 50% off applies to any quantity.
How to calculate salary hike percentage? ▼
Salary Hike % = ((New Salary – Old Salary) ÷ Old Salary) × 100. Example: Old salary ₹50,000, new salary ₹60,000 = ((60,000 – 50,000) ÷ 50,000) × 100 = 20% hike.
Can I use this calculator for business calculations? ▼
Yes! Perfect for calculating profit margins, revenue growth, expense reductions, sales targets, commission percentages, inventory changes, and financial ratios. Free for unlimited business use.
How to calculate tip percentage at restaurants? ▼
Standard tip in India: 10% (good service), 15% (excellent service). Calculate: Bill × (Tip % ÷ 100). Example: Bill ₹2,000, 10% tip = ₹2,000 × 0.10 = ₹200. Quick trick: 10% = move decimal left one place!
Is this calculator accurate for financial planning? ▼
Yes! Uses standard mathematical formulas with up to 2 decimal precision. Perfect for quick calculations. For critical financial decisions involving large amounts, always consult a certified financial advisor or CA.
Does this calculator work offline? ▼
Once the page loads, yes! All calculations happen in your browser (client-side). No internet needed after initial load. No data is sent to servers. Your privacy is 100% protected.
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⚖️ Disclaimer
This calculator provides approximate results for informational purposes only. While we use standard formulas, we make no guarantees of accuracy. For critical financial decisions, consult a qualified professional (CA, financial advisor). GST rates are current as of October 2025—verify on gst.gov.in. Use at your own risk. By using this tool, you agree to these terms.