GST Calculator – Add or Remove GST
Work out GST on any amount with a full CGST, SGST and IGST breakup.
How to use the GST Calculator
- Choose Add GST if your price excludes tax, or Remove GST if it already includes tax.
- Enter the amount.
- Pick the GST rate (or enter a custom one).
- Press Calculate to see the breakup.
GST formulas
- Add GST: GST = amount × rate ÷ 100; total = amount + GST.
- Remove GST: taxable value = amount × 100 ÷ (100 + rate); GST = amount − taxable value.
CGST, SGST and IGST
For a sale within the same state, GST is split equally into Central GST and State GST – for example 18% = 9% CGST + 9% SGST. For a sale to another state, the full rate is charged as Integrated GST (IGST).
GST rate structure
After the GST rate rationalisation in 2025, most goods and services fall under 5% and 18%, with 40% for a small list of luxury and sin goods, plus special rates such as 3% for gold and 0.25% for rough diamonds. Older 12% and 28% options are kept for reference and past invoices. Always check the current rate for your HSN/SAC code.
Frequently asked questions
How do I remove 18% GST from a price?
Divide the inclusive price by 1.18. For ₹1,180 the taxable value is ₹1,000 and GST is ₹180.
When is IGST charged?
On inter-state supplies and imports. CGST + SGST apply to intra-state supplies.
Which GST rate applies to my product?
It depends on the HSN or SAC code. Check the CBIC rate notifications.
Last updated: 10 November 2026