Free GST Calculator India 2026 — Add, Extract & Reverse
Calculate GST instantly on any amount. Supports all GST 2.0 slabs — 0%, 5%, 18%, 40% (and 3% for gold). Get full IGST & CGST+SGST breakdown in seconds..
Enter the original price — GST will be added on top.
- Restaurant / Food delivery 5%
- Most medicines & pharma products 5%
- Packaged food (butter, ghee, namkeen, biscuits) 5%
- Electronics, mobiles, TVs & ACs 18%
- Small cars & auto parts 18%
- Luxury cars, tobacco, pan masala & aerated drinks 40%
- Books, notebooks & newspapers 0%
- Clothing (up to ₹2,500 per piece) 5%
- Gold & jewellery 3%
IGST applies on inter-state sales (selling to a buyer in a different state).
CGST + SGST applies on intra-state sales (both in same state). Each is half the total GST rate.
Stop calculating GST manually
ERP Group auto-calculates GST on every invoice, reconciles returns, and files GSTR-1 in one click.
Add GST (Exclusive)
Enter your base price. The calculator adds the GST amount on top to give you the final invoice value.
Extract GST (Inclusive)
Enter a price that already includes GST. The calculator separates the base amount from the tax component.
Reverse Calculation
Enter a GST amount and rate to find the original taxable value and the total invoice amount.
What is GST & How Does This Calculator Work?
Everything you need to know about India's Goods and Services Tax — and how our free calculator saves you time every day.
GST (Goods and Services Tax) is India's unified indirect tax system, introduced on 1st July 2017. It replaced over 17 different central and state taxes — including VAT, Service Tax, Central Excise Duty, and Entry Tax — into one comprehensive nationwide tax framework.
GST follows a "One Nation, One Tax" philosophy, meaning the same GST rate applies to a product or service regardless of which Indian state it is bought or sold in. This eliminates the cascading effect of multiple taxes and makes compliance transparent and digital through the GSTN portal.
💡 ERP Group's GST Calculator helps you compute GST instantly — whether you're preparing a sales invoice, checking an MRP price, or reconciling your monthly purchases. No formulas, no manual errors.
Since GST 2.0 took effect on 22 September 2025, India has three main GST slabs: 5%, 18% and 40%, plus 0% (nil) for essentials. The old 12% and 28% slabs were merged away: most 12% items moved to 5%, most 28% items moved to 18%, and luxury and sin goods such as big cars, aerated drinks, tobacco and pan masala now attract 40%.
Levied by the Central Government on intra-state transactions. Always paired with SGST — each is half the total GST rate.
Collected by the State Government on intra-state sales. Combined with CGST, they equal the full applicable GST rate.
Applied on inter-state transactions (sales between different states) and imports. IGST equals the full GST rate.
How to Use the GST Calculator — 4 Simple Steps
Calculate GST in seconds — no formulas, no spreadsheets, no errors.
Choose Calculation Mode
Select Add GST for base price, Extract GST if price includes tax, or Reverse if you know the GST amount.
Enter Your Amount (₹)
Type the price in rupees. For Add mode, enter price before tax. For Extract, enter total including GST. For Reverse, enter the GST amount.
Select the GST Rate
Choose the applicable GST slab — 0%, 5%, 18% or 40% — from the rate buttons, or type a special rate such as 3% for gold. Refer to the common rates table if unsure.
Choose Supply Type & Calculate
Select IGST for inter-state or CGST+SGST for intra-state. Click "Calculate GST Now" for instant breakdown.
GST Calculation Formulas Explained
Our calculator uses these standard formulas approved by the GST Council of India.
Final Price = Price + GST Amount
Example: Price = ₹10,000, GST = 18%
GST Amount = ₹1,800
Final Invoice = ₹11,800
GST Amount = Total − Base Price
Example: Total = ₹11,800, GST = 18%
Base Price = ₹10,000
GST = ₹1,800
Total Price = Base Price + GST Amount
Example: GST = ₹1,800, Rate = 18%
Base Price = ₹10,000
Total = ₹11,800
GST Rate Slabs in India 2026 — Complete Reference Table
Use this quick-reference table to find the correct GST slab for your product or service before calculating.
| GST Slab | Category | Common Items / Services | CGST | SGST | IGST |
|---|---|---|---|---|---|
| 0% (Nil) | Essential Goods | Fresh fruits & vegetables, milk, eggs, bread, books, newspapers, bangles | 0% | 0% | 0% |
| 5% | Necessities | Most medicines, packaged food (butter, ghee, cheese, namkeen, biscuits), edible oils, clothing & footwear up to ₹2,500, restaurant services | 2.5% | 2.5% | 5% |
| 18% | Most Goods & Services | Electronics & mobiles, TVs & ACs, small cars & two-wheelers up to 350cc, auto parts, cement, IT services, banking, telecom | 9% | 9% | 18% |
| 40% | Luxury / Sin Goods | Tobacco & pan masala, mid-size & large cars, motorcycles above 350cc, aerated & sugary drinks, yachts & private aircraft, online betting | 20% | 20% | 40% |
| 3% | Precious Metals | Gold, silver, diamonds, jewellery, precious stones | 1.5% | 1.5% | 3% |
Frequently Asked Questions About GST Calculator
Answers to the most common questions about GST calculation in India.
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