GST Calculator
Add GST to an amount, or remove it from a GST-inclusive price, with the standard CGST + SGST split shown for intra-state transactions.
Adding vs. removing GST
Adding GST to a base amount multiplies it by the rate and adds that on top. Removing GST from a GST-inclusive total works differently — dividing the total by (1 + rate/100) gives the base amount, not multiplying by the rate directly, since the total already includes the tax.
CGST and SGST
For intra-state (within the same state) transactions in India, GST is typically split equally between CGST (Central GST) and SGST (State GST) — each half of the total GST rate. Inter-state transactions instead use IGST at the full combined rate, paid as a single tax rather than split.
Frequently asked questions
How do I add GST to a price?
Multiply the base amount by the GST rate and add it to the base — for example, ₹1,000 at 18% GST adds ₹180, for a total of ₹1,180. Select "Exclusive of GST" above to calculate this.
How do I find the base price from a GST-inclusive amount?
Divide the total by (1 + rate/100) — for example, a ₹1,180 total at 18% GST has a base price of 1180 ÷ 1.18 = ₹1,000. Select "Inclusive of GST" above for this direction.
What's the difference between CGST, SGST, and IGST?
For sales within the same state, GST splits equally into CGST (goes to the central government) and SGST (goes to the state government). For sales between different states, IGST applies instead — a single combined tax at the full rate, later apportioned between governments.
What are the standard GST rates in India?
The common slabs are 5%, 12%, 18%, and 28%, with some goods/services at 0% or under special rates — this calculator covers the four common slabs, but always confirm the applicable rate for your specific product or service.