Financial & Taxation100% Free & Instant
GST Calculator (India)
Quickly compute Inclusive and Exclusive Goods and Services Tax (GST) with instant CGST, SGST, and IGST breakdowns for billing and invoicing.
₹
₹100Enter bill or invoice item price₹1,000,000
Total Calculation
GST Breakdown
Total Gross Payable
₹29,500
Net Pre-Tax Base₹25,000
Total GST (18%)+ ₹4,500
↳ CGST (9%)₹2,250
↳ SGST / UTGST (9%)₹2,250
Formula & Mathematical Definition
GST (Goods and Services Tax) calculation relies on two fundamental formulas depending on whether tax is added or extracted:
1. GST Exclusive (Add GST)
GST Amount = (Net Amount × GST Rate) ÷ 100
Total Amount = Net Amount + GST Amount2. GST Inclusive (Extract GST)
Net Pre-Tax = (Total Amount × 100) ÷ (100 + GST Rate)
GST Amount = Total Amount - Net Pre-TaxHow to Use & Step-by-Step Example
- Select Calculation Mode: Choose Exclusive if you are invoicing a client and adding tax on top, or Inclusive if your sticker price already includes tax.
- Enter Bill Amount: Adjust the slider or type the amount directly into the input box.
- Choose GST Slab: Click any standard tax slab (0%, 3%, 5%, 12%, 18%, or 28%).
- View Live Breakdown: The right panel instantly updates with Net Amount, CGST, SGST, IGST, and Total Payable.
- 1-Click Copy: Click the "Copy Result" button at the top to paste the complete invoice breakdown directly into WhatsApp, email, or your billing software.
Standard Reference Slabs & Benchmarks
| GST Slab | Applicable Goods & Services | CGST + SGST Split |
|---|---|---|
| 0% (Nil) | Fresh vegetables, milk, eggs, unbranded grains, salt, education & healthcare. | 0% + 0% |
| 3% (Special) | Gold, silver, precious stones, jewellery. | 1.5% + 1.5% |
| 5% (Low) | Packaged tea, spices, sugar, medicines, economy air travel, railway tickets. | 2.5% + 2.5% |
| 12% (Standard I) | Computers, processed foods, mobile phones, business air travel, work contracts. | 6% + 6% |
| 18% (Standard II) | Software & IT services, banking, telecom, branded garments, restaurants. | 9% + 9% |
| 28% (Luxury) | Motor vehicles, high-end motorcycles, air conditioners, aerated drinks. | 14% + 14% |
Frequently Asked Questions (FAQ)
GST Exclusive means the price of the good/service does not yet include tax. GST is added on top of the base price. GST Inclusive means the final retail price already includes the GST tax component, so the base price is extracted backwards.