GST Calculator
Calculate GST (Goods and Services Tax) on any amount. Add GST to a base price or remove GST to find the pre-tax amount.
Net Amount (Including GST)
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GST Explained
GST (Goods and Services Tax) is a value-added tax levied on most goods and services. The tax rate varies by product category. Under the GST 2.0 reform (effective September 2025), GST slab rates are 0%, 5%, 18%, and 40%, with legacy special rates of 3% (gold/silver) and 0.25% (rough precious stones) continuing to apply.
Add GST: Total = Amount × (1 + Rate/100)
Remove GST: Base = Amount / (1 + Rate/100)
Remove GST: Base = Amount / (1 + Rate/100)
Current GST slabs in India (GST 2.0, effective September 2025)
| Slab | Applies to |
|---|---|
| 0% (Nil-rated) | Notebooks, pencils, maps, and other specified essential items |
| 5% | Essential goods — toothpaste, soap, shampoo, dairy products, medical diagnostic kits |
| 18% | Standard rate — most commercial goods and services, electronics, automobiles |
| 40% | Luxury and sin goods — aerated beverages, tobacco products, high-capacity motorcycles |
The earlier 12% and 28% slabs were removed under the GST 2.0 reform. If calculating GST for a specific product, confirm its current HSN classification — some items moved slabs in the transition.
Worked example: GST on an ₹18,000 invoice at each slab
| GST Rate | GST Amount | Total Invoice Value |
|---|---|---|
| 5% | ₹900 | ₹18,900 |
| 18% | ₹3,240 | ₹21,240 |
| 40% | ₹7,200 | ₹25,200 |
Common GST mistakes
- Confusing CGST+SGST with IGST. Intra-state sales split the rate into CGST + SGST (e.g. 9%+9% for an 18% item); inter-state sales charge the full rate as IGST. The total tax is the same either way — only the split differs.
- Applying the wrong slab after the 2025 reform. Several items shifted slabs — always verify current HSN classification rather than assuming last year’s rate still applies.
- Freelancers/small businesses miscalculating GST on top of already-inclusive quoted prices. Confirm with your client upfront whether a quoted price is GST-inclusive or exclusive before invoicing.