GST Calculator
Add GST to a price or extract GST from a GST-inclusive amount, with CGST, SGST and IGST split.
Runs in your browser. Your input is processed on your device and is not uploaded to our server.
GST rate
Total including GST
–
- Net amount (before GST) –
- GST amount –
- CGST –
- SGST / UTGST –
- IGST –
- Gross amount –
Check the applicable rate for your goods or services (HSN/SAC). Works for VAT and sales tax too.
How to use the GST Calculator
- Enter the amount and choose whether it excludes or includes GST.
- Pick a GST rate or type a custom rate.
- Read the GST amount, the net and gross price, and the CGST/SGST or IGST split.
Formulas
- Adding GST:
GST = amount × rate ÷ 100; gross = amount + GST. - Removing GST:
GST = amount − amount × 100 ÷ (100 + rate).
For an intra-state supply in India, GST is split equally into CGST and SGST (or UTGST). For an inter-state supply, the whole amount is IGST. The rate presets reflect the GST rate structure in force since 22 September 2025 (5%, 18% and 40%, alongside special rates). Rates depend on the HSN or SAC code of the goods or services, so confirm the correct rate for your item. The calculator also works for VAT or sales tax in other countries.
Frequently asked questions
Is GST calculated on the price including discount?
Yes. GST applies to the transaction value after discounts shown on the invoice.
Which rate applies to my product?
It depends on the HSN or SAC classification. Check the official GST rate notifications or ask your tax adviser.