What is the difference between Add GST and Remove GST?

**Add GST** (Exclusive to Inclusive): Use when you have a base price without GST and want to calculate the final price with GST. Example: Product costs ₹10,000, add 18% GST = ₹11,800 final price. **Remove GST** (Inclusive to Exclusive): Use when you have a final price with GST and want to find the original base price. Example: Bill shows ₹11,800 (with GST), remove 18% GST = ₹10,000 base price.

What is CGST, SGST, and IGST?

**CGST** (Central GST) and **SGST** (State GST) are charged on **intra-state transactions** (buyer and seller in the same state). They split the total GST equally—9% CGST + 9% SGST = 18% total. **IGST** (Integrated GST) is charged on **inter-state transactions** (buyer and seller in different states). IGST is the full GST rate—18% IGST. Use CGST+SGST for same-state sales, IGST for different-state sales.

What are the GST rates in India?

India has **7 GST slabs**: **0%** (exempt items like milk, bread), **0.25%** (precious stones), **3%** (gold/silver), **5%** (essential goods like sugar, tea), **12%** (computers, processed food), **18%** (most goods/services like IT, restaurants), and **28%** (luxury items like cars, AC). The most common rate is 18%. Use the dropdown in the calculator to select your rate or choose "Custom Rate" for other percentages.

How do I calculate GST if the rate is not listed?

Select **"Custom Rate"** from the GST Rate dropdown. A new field appears where you can enter any GST percentage (e.g., 15%, 20%, 12.5%). The calculator supports decimals for precise rates. Example: For a 15% GST rate, select Custom Rate → Enter 15 → Calculate. This works for composition scheme rates (1%, 5%, 6%) or any special rates.

How do I verify if my invoice GST calculation is correct?

Use **Remove GST** mode: Enter the final amount from your invoice, select the GST rate, and click Calculate. Compare the results: **Base Amount** should match the invoice's pre-GST price, **GST Amount** should match the tax charged, and **Total Amount** should match the invoice total. If numbers don't match, check if the invoice used the correct GST rate or if there are rounding differences.

When should I use CGST/SGST vs. IGST on my invoice?

Use **CGST + SGST** for **intra-state sales** (buyer and seller in the same state). Example: Delhi seller → Delhi buyer = 9% CGST + 9% SGST. Use **IGST** for **inter-state sales** (buyer and seller in different states). Example: Delhi seller → Mumbai buyer = 18% IGST. Check the buyer's state in their GSTIN (first 2 digits are state code). Match state codes = intra-state, different codes = inter-state.

Is my financial data safe when using this calculator?

Yes. All calculations happen **100% in your browser** using JavaScript. No data is sent to any server, logged, or stored. When you close the tab, all data is gone. This tool is completely private and safe for business invoicing, accounting, and tax calculations. You can even use it offline once the page loads. No third parties see your amounts or GST details.

How do I calculate net GST payable using Input Tax Credit (ITC)?

**Formula**: Net GST Payable = Output Tax (GST collected on sales) - Input Tax Credit (GST paid on purchases). **Example**: You sold goods for ₹1,00,000 + 18% GST = ₹18,000 output tax. You bought materials for ₹50,000 + 18% GST = ₹9,000 input tax. Net GST = ₹18,000 - ₹9,000 = ₹9,000. Use this calculator to verify GST amounts on both sales and purchase invoices before filing GSTR-3B.

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GST Calculator

Calculate GST inclusive and exclusive prices. Add or remove GST with CGST, SGST, and IGST breakdown for Indian businesses.

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How to Use GST Calculator

What is GST?

GST (Goods and Services Tax) is an indirect tax levied on the supply of goods and services in India. It replaced multiple indirect taxes like VAT, Service Tax, and Excise Duty with a unified tax system implemented on July 1, 2017.

GST Components:

CGST (Central GST): Central government's share (for intra-state transactions)
SGST (State GST): State government's share (for intra-state transactions)
IGST (Integrated GST): Combined tax (for inter-state transactions)

Formula: CGST + SGST = IGST (equal to total GST rate)

What is a GST Calculator?

A GST calculator helps you:

Add GST to a base price (exclusive → inclusive)
Remove GST from a final price (inclusive → exclusive)
Calculate CGST, SGST, and IGST components
Determine exact tax amounts for invoicing and accounting

How to Use This GST Calculator

Step 1: Select Calculation Mode

Choose between two modes:

Add GST (Exclusive to Inclusive)

Use this when you have a base price without GST and want to calculate the final price with GST.

Example: You sell a product for ₹10,000 (base price). With 18% GST, what is the final price?

Formula: Final Price = Base Price + (Base Price × GST Rate / 100)

Remove GST (Inclusive to Exclusive)

Use this when you have a final price with GST and want to find the original base price without GST.

Example: A bill shows ₹11,800 (including GST). What was the original price before 18% GST?

Formula: Base Price = Final Price / (1 + GST Rate / 100)

Step 2: Enter the Amount

Enter the amount in Indian Rupees (₹):

For Add GST mode: Enter the base price (excluding GST)
For Remove GST mode: Enter the final price (including GST)

Tips:

Use decimals for precise amounts (e.g., ₹1,234.56)
No need to add currency symbols—just the number

Step 3: Select GST Rate

Choose the applicable GST rate from the dropdown:

GST Rate	Category	Examples
0%	Exempt items	Fresh fruits, vegetables, milk, bread, newspapers
0.25%	Precious stones	Cut and polished diamonds, gemstones
3%	Gold & Silver	Gold jewelry, silver articles
5%	Essential goods	Sugar, tea, coffee, edible oils, coal, medicines
12%	Standard goods	Computers, processed food, mobile phones (below ₹25,000)
18%	Most goods & services	Restaurants (non-AC), IT services, capital goods, soaps
28%	Luxury items	Air conditioners, automobiles, cigarettes, aerated drinks
Custom Rate	Any other rate	Enter your own GST percentage

Note: If your GST rate is not listed (e.g., 15% or 20%), select "Custom Rate" and enter the exact percentage.

Step 4: Enter Custom Rate (If Applicable)

If you selected "Custom Rate", a new field appears:

Enter the exact GST percentage (e.g., 15, 20, 25)
Supports decimals (e.g., 12.5%)

Step 5: Calculate and View Results

Click the Calculate button to see:

Base Amount (excluding GST): Original price before tax
GST Amount: Total tax amount
GST Rate: Percentage applied
Total Amount (including GST): Final price with tax
CGST (Intra-state): Central GST (half of total GST)
SGST (Intra-state): State GST (half of total GST)
IGST (Inter-state): Integrated GST (full GST amount)

Understanding CGST/SGST vs. IGST:

Intra-state (within same state): Use CGST + SGST
Inter-state (between different states): Use IGST

Common Use Cases

Case 1: Adding GST to Product Price

Scenario: You sell a laptop for ₹50,000 (base price). You need to add 18% GST and calculate the final price.

Steps:

Select mode: Add GST
Enter amount: 50000
Select GST rate: 18%
Click Calculate

Results:

Base Amount: ₹50,000
GST Amount: ₹9,000 (18% of ₹50,000)
Total Amount: ₹59,000
CGST: ₹4,500 (9%)
SGST: ₹4,500 (9%)
IGST: ₹9,000 (18%)

Use case: Invoicing, pricing products for customers.

Case 2: Removing GST from Invoice Total

Scenario: Your bill shows ₹23,600 (including 18% GST). You want to find the original price and GST amount.

Steps:

Select mode: Remove GST
Enter amount: 23600
Select GST rate: 18%
Click Calculate

Results:

Base Amount: ₹20,000
GST Amount: ₹3,600
Total Amount: ₹23,600
CGST: ₹1,800 (9%)
SGST: ₹1,800 (9%)
IGST: ₹3,600 (18%)

Use case: Accounting, expense reporting, tax filing.

Case 3: E-commerce Pricing

Scenario: You sell products online. The base price is ₹1,500, and you need to display the GST-inclusive price.

Steps:

Select mode: Add GST
Enter amount: 1500
Select GST rate: 18%
Click Calculate

Results:

Total Amount: ₹1,770

Use case: Setting product prices on e-commerce platforms (Amazon, Flipkart, your website).

Case 4: Restaurant Bill Verification

Scenario: Your restaurant bill is ₹3,540 (including 5% GST on food). You want to verify the base amount and GST.

Steps:

Select mode: Remove GST
Enter amount: 3540
Select GST rate: 5%
Click Calculate

Results:

Base Amount: ₹3,371.43
GST Amount: ₹168.57
Total Amount: ₹3,540

Use case: Verifying restaurant bills, hotel invoices.

Case 5: Inter-State vs. Intra-State GST

Scenario: You ship goods worth ₹10,000 to another state with 12% GST.

Steps:

Select mode: Add GST
Enter amount: 10000
Select GST rate: 12%
Click Calculate

Results:

Total Amount: ₹11,200
IGST: ₹1,200 (12%) ← Use this for inter-state
CGST + SGST: ₹600 each ← Use this for intra-state

Use case: Filing GST returns (GSTR-1, GSTR-3B), invoicing customers in different states.

Case 6: Jewelry Purchase (3% GST)

Scenario: You buy gold jewelry worth ₹1,00,000. The jeweler applies 3% GST (making charges). What is the final price?

Steps:

Select mode: Add GST
Enter amount: 100000
Select GST rate: 3%
Click Calculate

Results:

Total Amount: ₹1,03,000
GST Amount: ₹3,000

Use case: Jewelry invoicing, gold/silver purchases.

Case 7: Custom GST Rate

Scenario: Your service has a special GST rate of 15%. The base amount is ₹20,000.

Steps:

Select mode: Add GST
Enter amount: 20000
Select GST rate: Custom Rate
Enter custom rate: 15
Click Calculate

Results:

Total Amount: ₹23,000
GST Amount: ₹3,000

Use case: Special categories, composite schemes, custom tax rates.

Understanding GST Rates in India

GST Slabs and Categories

India has 7 GST rate slabs: 0%, 0.25%, 3%, 5%, 12%, 18%, and 28%.

0% GST (Exempt)

Items:

Fresh fruits and vegetables
Milk, curd, butter milk
Bread, flour (atta)
Newspapers, printed books
Education services
Healthcare services

0.25% GST

Items:

Cut and polished diamonds
Precious stones

3% GST

Items:

Gold and silver jewelry (making charges)
Gold coins

5% GST

Items:

Sugar, tea, coffee
Edible oils
Coal and lignite
Medicines and drugs
Domestic air travel (economy)
Small restaurants (no AC, no alcohol)

12% GST

Items:

Computers and laptops
Processed food items
Mobile phones (below ₹25,000)
Ayurvedic medicines
Business class air travel

18% GST (Most Common)

Items:

Restaurants (AC, alcohol served)
IT and telecom services
Capital goods and industrial machinery
Soaps, shampoos, toothpaste
Mobile phones (above ₹25,000)
Banking and financial services

28% GST (Luxury and Sin Goods)

Items:

Air conditioners
Refrigerators
Automobiles (cars, motorcycles)
Cigarettes and tobacco
Aerated drinks
Hotels (₹7,500+ per night)

Note: Some items in the 28% slab also attract a cess (additional tax) on top of GST.

GST Formulas Explained

Formula 1: Adding GST (Exclusive to Inclusive)

Given: Base Price and GST Rate Find: Total Price

Formula:

GST Amount = (Base Price × GST Rate) / 100
Total Price = Base Price + GST Amount

Example:

Base Price: ₹10,000
GST Rate: 18%
GST Amount: (10,000 × 18) / 100 = ₹1,800
Total Price: 10,000 + 1,800 = ₹11,800

Formula 2: Removing GST (Inclusive to Exclusive)

Given: Total Price (including GST) and GST Rate Find: Base Price and GST Amount

Formula:

Base Price = Total Price / (1 + GST Rate / 100)
GST Amount = Total Price - Base Price

Alternative formula:

Base Price = (Total Price × 100) / (100 + GST Rate)

Example:

Total Price: ₹11,800
GST Rate: 18%
Base Price: 11,800 / 1.18 = ₹10,000
GST Amount: 11,800 - 10,000 = ₹1,800

CGST and SGST Calculation (Intra-State)

Formula:

CGST = GST Amount / 2
SGST = GST Amount / 2
CGST Rate = GST Rate / 2
SGST Rate = GST Rate / 2

Example:

GST Amount: ₹1,800
GST Rate: 18%
CGST: ₹900 (9%)
SGST: ₹900 (9%)

IGST Calculation (Inter-State)

Formula:

IGST = GST Amount
IGST Rate = GST Rate

Example:

GST Amount: ₹1,800
IGST: ₹1,800 (18%)

Tips for Businesses

Invoicing Best Practices

Include on GST Invoice:

GSTIN (GST Identification Number) - yours and customer's
Invoice number and date
Base amount (before GST)
GST rate and amount (CGST/SGST or IGST)
Total amount (including GST)
HSN/SAC code (product/service classification)

Example Invoice:

Product: Laptop
Base Price: ₹50,000
CGST (9%): ₹4,500
SGST (9%): ₹4,500
Total: ₹59,000

When to Charge CGST/SGST vs. IGST

Intra-State (within same state):

Charge CGST + SGST
Example: Seller in Maharashtra → Buyer in Maharashtra

Inter-State (different states):

Charge IGST
Example: Seller in Maharashtra → Buyer in Karnataka

Special Cases:

Union Territories: May use UTGST instead of SGST
Exports: 0% GST (with Input Tax Credit refund)
Imports: IGST + customs duty

GST Return Filing

Use this calculator to:

Calculate total GST collected (output tax)
Verify GST paid on purchases (input tax credit)
Reconcile amounts before filing GSTR-1 (sales) and GSTR-3B (summary)

Tip: Keep records of all invoices with GST breakdowns for audits.

Troubleshooting

Result Doesn't Match My Invoice

Possible causes:

Wrong mode selected: Use "Add GST" for base price → final price, "Remove GST" for final price → base price
Incorrect GST rate: Double-check the rate applicable to your product/service
Rounding differences: Some systems round at different stages

Solution: Verify the GST rate from official GST portal or your tax consultant.

CGST + SGST ≠ Total GST Amount

Cause: Rounding errors with decimals.

Example:

GST Amount: ₹1,000.01
CGST: ₹500.00 (rounded down)
SGST: ₹500.01 (rounded up)
Total: ₹1,000.01 ✅

Solution: This is normal. The calculator displays exact values (2 decimal places).

Custom GST Rate Field Not Showing

Cause: You haven't selected "Custom Rate" from the GST Rate dropdown.

Solution: Select "Custom Rate" from the dropdown, then enter your percentage in the new field.

GST Compliance and Legal Notes

GST Registration Threshold

Mandatory GST registration if:

Annual turnover > ₹40 lakh (goods)
Annual turnover > ₹20 lakh (services)
E-commerce sellers (mandatory regardless of turnover)
Inter-state supply (mandatory regardless of turnover)

Special states (Northeast, Himachal Pradesh, Uttarakhand):

Threshold: ₹20 lakh (goods), ₹10 lakh (services)

Input Tax Credit (ITC)

What is ITC? Tax paid on purchases (input) can be claimed as credit against tax collected on sales (output).

Formula:

Net GST Payable = Output Tax - Input Tax Credit

Example:

You sold goods for ₹1,00,000 + 18% GST = ₹18,000 (output tax)
You purchased raw materials for ₹50,000 + 18% GST = ₹9,000 (input tax)
Net GST payable: 18,000 - 9,000 = ₹9,000

Use this calculator to verify GST amounts on purchase invoices for ITC claims.

Reverse Charge Mechanism (RCM)

In some cases, the buyer pays GST instead of the seller:

Services from unregistered suppliers
Imports of services
Specific notified goods/services

For RCM calculations: Use "Add GST" mode with the service amount as base price.

Composition Scheme

Small businesses (turnover < ₹1.5 crore) can opt for composition scheme:

Fixed GST rates: 1% (traders), 5% (restaurants), 6% (manufacturers)
Cannot claim input tax credit
Cannot make inter-state sales

For composition scheme: Use "Custom Rate" and enter your applicable rate (1%, 5%, or 6%).

Privacy and Security

Browser-Based Calculation

This GST calculator runs 100% in your browser:

✅ No data sent to servers
✅ No financial information stored
✅ No cookies or tracking
✅ Works offline (once loaded)

Your privacy is fully protected. All calculations happen locally using JavaScript.

External Resources

GST Portal (Official) - Official Government of India GST website
GST Rates Finder - Find GST rate for any product/service
GSTIN Search - Verify GSTIN of suppliers
GST Council - Latest GST policy updates
HSN/SAC Code Search - Find product/service codes

Frequently Asked Questions

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