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Calculate GST on any amount. Add GST to a base price, or extract the GST already included in a total. See the CGST/SGST split or IGST for inter-state supply.
Last updated 27 August 2026
Base amount
₹1,000
Total GST
₹180
Total amount
₹1,180
The price you are working with.
Exclusive = the amount is before GST. Inclusive = GST is already in the amount and should be extracted.
Select the slab. The base amount, GST, CGST/SGST split and total update instantly.
Exclusive: GST = A × R ÷ 100. Inclusive: Base = A × 100 ÷ (100 + R)
For intra-state supply, CGST = SGST = GST ÷ 2. For inter-state supply, IGST = GST.
GST = 1000 × 18 ÷ 100 = ₹180, split equally into CGST ₹90 and SGST ₹90. The invoice total becomes ₹1,180. To reverse: 1180 × 100 ÷ 118 = ₹1,000 base.
For a sale within the same state, GST is split equally into Central GST and State GST. For a sale across state lines, a single Integrated GST is charged at the full rate instead.
Choose “inclusive”. The calculator divides by (100 + rate) and multiplies by 100 to find the pre-GST base, then shows the GST portion.
GST rates depend on the HSN/SAC classification of the goods or service. Common slabs are 5%, 12%, 18% and 28%, with 0.25% and 3% for specific items. Check the official rate finder for your product.
Yes. Rates live in one place in our code, and you can also type any custom rate directly into the calculator.
This calculator provides estimates for general information only. Results are mathematical calculations based on the figures you enter and standard formulas. Actual bank, loan, deposit and investment products may differ due to fees, rounding conventions, day-count methods and changing rates and rules. Projected investment returns are not guaranteed and you may get back less than you invest. Nothing here is financial, tax or investment advice — verify the actual terms with the relevant institution or a qualified adviser before making a decision. See our full disclaimer.