GST Calculator India — Add or Remove GST Instantly
Working with GST-inclusive or exclusive prices? Enter any amount, pick the GST slab and choose whether to add GST on top or strip it out — the tax breakup appears instantly.
Total price (incl. GST)
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GST amount
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Base price (excl. GST)
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Price breakup
Base price vs GST (split into CGST + SGST).
How GST calculations work
GST in India is charged as a percentage of the pre-tax price. The two directions work like this:
- Add GST: GST = amount × rate ÷ 100, and total = amount + GST.
- Remove GST: base = amount ÷ (1 + rate ÷ 100), and GST = amount − base.
Worked examples
Adding 18% GST to ₹1,000: GST = 1,000 × 18 ÷ 100 = ₹180, so the total is ₹1,180.
Removing 18% GST from ₹1,180 (for instance, an MRP that already includes tax): base = 1,180 ÷ 1.18 = ₹1,000, and the GST hidden inside is ₹180. A common mistake is to subtract 18% of ₹1,180 (₹212.40) — that gives the wrong base price, because the 18% applies to the pre-tax amount, not the inclusive one. For businesses filing GSTR returns, this split matters: you report the base value and the tax separately, and claim input credit only on the GST portion.
India-specific notes
- Know your slab. The main slabs are 0%, 5%, 12%, 18% and 28%, with special rates such as 3% on gold and 0.25% on rough precious stones. Most everyday goods and services fall under 5%, 12% or 18% — check the HSN/SAC code if unsure.
- CGST + SGST vs IGST. Within a state, 18% GST is split as 9% CGST + 9% SGST; between states it is a single 18% IGST. The total you pay is identical.
- MRP is always inclusive. Indian law requires printed MRPs to include all taxes, so use "Remove GST" mode to find the pre-tax price of packaged goods.
- Input tax credit. GST-registered businesses can offset GST paid on purchases against GST collected on sales. If you run a business, always separate the GST component on invoices — this calculator's breakup helps.
- Composition scheme. Small businesses under the composition scheme pay GST at lower flat rates but cannot claim input tax credit and cannot charge GST separately on invoices.
GST Calculator FAQs
What are the GST slabs in India?
The main GST slabs are 0%, 5%, 12%, 18% and 28%, with special rates like 3% on gold and 0.25% on rough precious stones. Most goods and services fall under 5%, 12% or 18%.
How do I remove GST from a price?
Divide the GST-inclusive price by (1 + rate/100). For an 18% GST-inclusive price of ₹1,180: 1,180 ÷ 1.18 = ₹1,000 base price, and the GST component is ₹180. This calculator's "Remove GST" mode does this instantly.
Is GST included in the MRP?
Yes. Under Indian law, the MRP printed on packaged goods must be inclusive of all taxes including GST. So when you see an MRP, use the "Remove GST" mode to find the pre-tax price.
What is the difference between CGST, SGST and IGST?
For sales within a state, GST is split equally as CGST (centre) + SGST (state) — e.g. 18% becomes 9% + 9%. For inter-state sales, it is charged as a single IGST (18%). The total tax is the same either way.
Can businesses claim back the GST they pay?
Yes, through input tax credit (ITC). A GST-registered business can offset the GST paid on its purchases against the GST it collects on sales, so tax is effectively paid only on the value it adds. This is why businesses track GST separately.
Do I need to add GST on top of my service invoice?
If you are GST-registered and your service attracts GST (most services are 18%), yes — you charge GST on top of your base price and deposit it with the government, claiming input credit on your own business purchases.