GST Calculator: Calculate Tax-Inclusive and Tax-Exclusive Prices

Our free GST Calculator helps you instantly calculate Goods and Services Tax for any purchase or invoice, with support for multiple tax slabs and itemized breakdowns.

Whether you need to calculate GST-inclusive prices for your customers or determine the tax component of an existing price, this calculator provides accurate results using the latest tax rates. Perfect for business owners, accountants, and shoppers who need to understand the tax implications of their purchases.

GST Calculator

How to Use This GST Calculator

  1. Step 1: Select whether you want to add GST to an amount (tax-exclusive) or extract GST from an amount that already includes tax (tax-inclusive).
  2. Step 2: Enter the amount for which you want to calculate GST. This can be the base amount (for tax-exclusive) or the total amount including GST (for tax-inclusive).
  3. Step 3: Choose the appropriate GST rate from the dropdown (5%, 12%, 18%, 28%) or select "Custom Rate" to enter a specific percentage.
  4. Step 4: Click the "Calculate" button to see the breakdown showing the original amount, GST amount, and total amount including tax.

How the GST Calculator Works

The GST Calculator uses standard tax formulas to calculate both tax-inclusive and tax-exclusive prices based on the applicable GST rate.

Formulas Used

To calculate GST amount from a tax-exclusive price:
GST Amount = Original Price × (GST Rate ÷ 100)

To calculate total price including GST:
Total Price = Original Price + GST Amount

To extract GST amount from a tax-inclusive price:
GST Amount = Tax-Inclusive Price × [GST Rate ÷ (100 + GST Rate)]

To extract original price from a tax-inclusive price:
Original Price = Tax-Inclusive Price ÷ (1 + GST Rate ÷ 100)

Example Calculation

Let's say you have a product priced at ₹100 (excluding GST) and the GST rate is 10%:

  1. GST Amount = ₹100 × (10 ÷ 100) = ₹10
  2. Total Price Including GST = ₹100 + ₹10 = ₹110

Conversely, if you have a tax-inclusive price of ₹110 with a 10% GST rate:

  1. GST Amount = ₹110 × [10 ÷ (100 + 10)] = ₹110 × (10 ÷ 110) = ₹10
  2. Original Price Excluding GST = ₹110 ÷ (1 + 10 ÷ 100) = ₹110 ÷ 1.1 = ₹100

Common Uses for GST Calculator

Business Invoice Preparation

Businesses use this calculator to prepare accurate invoices by adding GST to their product or service prices. For example, if you're selling a product for ₹5,000 and need to add 18% GST, the calculator shows the GST amount (₹900) and total invoice amount (₹5,900). This ensures compliance with tax regulations and provides transparency to customers about tax components.

Retail Price Analysis

Retailers often receive products with GST-inclusive pricing and need to understand the tax component for accounting purposes. Using the tax-inclusive calculation, they can extract the original price and GST amount from the total price. This is essential for proper bookkeeping, profit margin analysis, and understanding the actual cost of goods sold.

Tax Planning and Compliance

Accountants and tax professionals use GST calculators for tax planning, compliance verification, and audit preparation. The calculator helps verify GST amounts on invoices, prepare tax returns, and ensure accurate tax collection and remittance. It's particularly useful when dealing with multiple tax slabs (5%, 12%, 18%, 28%) across different products and services.

Industry-Specific GST Calculation Examples

Restaurant Business: Mixed GST Rates

Scenario: Raj's restaurant serves both dine-in and takeaway with different GST rates

Dine-in Service (18% GST):

  • Food Bill: ₹1,000
  • GST @ 18%: ₹180
  • Total Bill: ₹1,180

Takeaway/Delivery (5% GST):

  • Food Bill: ₹1,000
  • GST @ 5%: ₹50
  • Total Bill: ₹1,050

Key Insight: Same food, different GST rates based on service type. Restaurants must maintain separate billing for dine-in vs takeaway.

E-commerce Seller: TCS Implications

Scenario: Priya sells electronics on Amazon with ₹2 lakh monthly sales

Regular GST Calculation:

  • Sales Value: ₹2,00,000
  • GST @ 18%: ₹36,000
  • Input Tax Credit: ₹20,000
  • Net GST Liability: ₹16,000

Additional TCS by E-commerce Platform:

  • TCS @ 1% on sales: ₹2,000
  • Can be adjusted against GST liability
  • Final GST Payment: ₹14,000

Pro Tip: E-commerce sellers should factor in TCS collected by platforms when calculating net GST liability.

Construction Company: Reverse Charge Mechanism

Scenario: Construction company receiving services from unregistered contractor

Service Received:

  • Labor Contract Value: ₹50,000
  • Contractor: Unregistered
  • GST under Reverse Charge @ 18%: ₹9,000
  • Total Cost: ₹59,000

GST Treatment:

  • GST Liability (Output): ₹9,000
  • Input Tax Credit: ₹9,000
  • Net Impact: Zero (if eligible for ITC)

Important: Reverse charge applies when receiving services from unregistered suppliers above ₹5,000 per day.

Advanced GST Calculation Tips

  • HSN/SAC Code Verification: Always verify the correct HSN (goods) or SAC (services) code as GST rates can vary within similar product categories. Use the official GST portal for accurate classification.
  • Place of Supply Rules: For interstate transactions, determine the correct place of supply to apply IGST instead of CGST+SGST. This affects your GST calculation and compliance.
  • Composition Scheme Eligibility: Businesses with turnover up to ₹1.5 crore can opt for composition scheme with simplified GST rates (1-6%) but cannot claim input tax credit.
  • Input Tax Credit Matching: Ensure your input tax credit claims match with supplier's GSTR-1 filings. Mismatches can lead to credit reversals and penalties.
  • Export Calculations: Exports are zero-rated supplies. Calculate refund claims for input tax credit on export transactions using our calculator.

Frequently Asked Questions

Understanding GST Basics

What is GST and how does it work in India?

GST (Goods and Services Tax) is a comprehensive, multi-stage, destination-based tax that replaced multiple indirect taxes like VAT, service tax, and excise duty in India from July 1, 2017. It's levied on every value addition in the supply chain.

How GST Works: GST operates on the principle of input tax credit, where businesses can claim credit for GST paid on purchases against GST collected on sales. For example, if a manufacturer pays ₹1,000 GST on raw materials and collects ₹1,800 GST on finished goods, they only pay ₹800 to the government.

Key Benefits: GST eliminates the cascading effect of taxes, reduces compliance burden, and creates a unified national market. It's collected at the point of consumption, making it a destination-based tax.

Use our GST calculator above to quickly compute GST amounts for your business transactions.

What are the different GST rates in India 2025?

India follows a four-tier GST structure designed to keep essential items affordable while generating revenue from luxury goods:

  • 0% (Exempt): Basic food items (rice, wheat, milk), educational services, healthcare services
  • 5%: Essential items like medicines, food grains, tea, coffee, spices, life-saving drugs
  • 12%: Processed foods, textiles, ayurvedic medicines, mobile phones, computers
  • 18%: Most goods and services including IT services, restaurants (dine-in), soaps, toothpaste
  • 28%: Luxury items like automobiles, tobacco, aerated drinks, high-end consumer goods

Special Cases: Some luxury and sin goods attract additional cess on top of 28% GST. For example, cigarettes may have 28% GST plus additional cess.

Always verify current rates on the official GST portal as rates may change based on government notifications.

How is GST calculated on restaurant bills in India?

Restaurant GST calculation depends on the type of service and establishment:

Dine-in Restaurants: 18% GST on the total bill amount. If your bill is ₹1,000, GST = ₹180, Total = ₹1,180.

Takeaway/Delivery: 5% GST on food items. If your takeaway order is ₹500, GST = ₹25, Total = ₹525.

AC Restaurants vs Non-AC: Both dine-in restaurants (AC and non-AC) charge 18% GST. The distinction was removed in recent updates.

Alcohol: Alcoholic beverages are outside GST purview and attract state-specific taxes.

Use our calculator to verify restaurant bill calculations and ensure you're charged correctly.

Business Scenarios & Applications

How do I determine the correct GST rate for my product or service?

Determining the correct GST rate requires identifying the appropriate classification code:

For Goods: Use HSN (Harmonized System of Nomenclature) codes. Each product has a specific 4, 6, or 8-digit HSN code that determines the GST rate. For example, mobile phones have HSN code 8517 with 12% GST.

For Services: Use SAC (Services Accounting Code). Most services attract 18% GST unless specifically exempted or taxed at different rates.

Where to Check:

  • Official GST rate finder on government portal
  • GST rate schedules in official notifications
  • Consult with a tax professional for complex cases
  • Check similar products/services in your industry

Important: Misclassification can lead to penalties. When in doubt, seek professional advice or contact GST helpline.

What's the difference between GST-inclusive and GST-exclusive pricing?

Understanding pricing methods is crucial for accurate billing and compliance:

GST-Exclusive Pricing: The displayed price doesn't include GST. Tax is added separately at checkout. Common in B2B transactions.

Example: Product price ₹1,000 + 18% GST (₹180) = Total ₹1,180

GST-Inclusive Pricing: The displayed price already includes GST. Common in retail (B2C) transactions.

Example: Total price ₹1,180 includes base price ₹1,000 + GST ₹180

Legal Requirements: B2C businesses must display GST-inclusive prices. B2B transactions typically use GST-exclusive pricing for clarity.

Calculator Usage: Our calculator handles both scenarios - use "Add GST" for exclusive pricing and "Extract GST" for inclusive pricing.

How do I calculate GST for interstate vs intrastate transactions?

GST calculation method depends on whether the transaction crosses state boundaries:

Intrastate Transactions (within same state):

  • CGST (Central GST) + SGST (State GST)
  • Total rate remains same, split equally
  • Example: 18% GST = 9% CGST + 9% SGST

Interstate Transactions (between different states):

  • IGST (Integrated GST) only
  • Single tax component
  • Example: 18% IGST (no CGST/SGST)

Calculation Impact: The total GST amount remains the same regardless of transaction type. Only the distribution between central and state governments changes.

Our calculator computes the total GST amount applicable to your transaction value.

Common Issues & Solutions

Why is my GST calculation different from my accountant's calculation?

Discrepancies in GST calculations can occur due to several factors:

Common Reasons for Differences:

  • Rounding Methods: Different rounding approaches (round to nearest paisa vs round up)
  • Additional Charges: Inclusion of cess, surcharge, or other taxes
  • Discount Application: Whether GST is calculated before or after discount
  • Composition Scheme: Different rates for composition taxpayers
  • Exemptions: Partial exemptions or special category considerations

When to Consult Professionals: For complex transactions involving multiple tax rates, exemptions, or special schemes, professional consultation is recommended.

Verification Steps: Cross-check HSN/SAC codes, applicable rates, and calculation method with official GST portal.

Can this calculator be used for international VAT calculations?

Yes, our GST calculator can be adapted for VAT calculations worldwide:

Universal Application: The mathematical formulas for calculating tax-inclusive and tax-exclusive amounts are universal across countries.

International VAT Rates (2025):

  • United Kingdom: 20% VAT
  • Germany: 19% VAT
  • France: 20% VAT
  • Canada: 5-15% (varies by province)
  • Australia: 10% GST

Usage Instructions: Simply enter the applicable VAT rate for your country in the GST rate field. The calculator will provide accurate results for any percentage-based tax system.

Note: Always verify current rates and regulations in your jurisdiction as tax laws vary by country and may change frequently.