Total payable
₹0
Base amount
₹0
Total GST
₹0
Finance Calculators
GST Calculator
Add or remove GST from an amount and split the tax into CGST + SGST or IGST. Free, fast, and built for a clean browser workflow.
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About this tool
This GST calculator adds tax on top of a base amount, or extracts tax from a GST-inclusive price, using the common Indian slabs of 5%, 12%, 18%, and 28%, plus a custom rate.
Intra-state supply splits the tax equally into CGST and SGST. Inter-state supply shows the full amount as IGST.
The math runs in your browser. It is a planning aid for invoices and quotes, not a filing or legal opinion.
Tips for better results
- To remove GST from a tax-inclusive price, divide by (1 + rate/100). An ₹118 bill at 18% has a base of ₹100 and tax of ₹18.
- CGST and SGST are each half of the total GST on an intra-state invoice. IGST is the full GST on an inter-state invoice.
- Confirm the correct HSN or SAC rate for your product. This page does not look up tax categories.
- Round rupees the way your invoice software does before you issue a tax invoice.
How to use
- 1 Enter the amount and choose a GST rate.
- 2 Choose whether the amount is before tax or already includes tax.
- 3 Choose intra-state (CGST + SGST) or inter-state (IGST) and read the split.
FAQ
Can I remove GST from a total?
Yes. Choose the inclusive mode. The tool splits the entered amount into base price and GST.
What is the difference between CGST, SGST, and IGST?
CGST and SGST apply to supplies within a state and split the rate in half. IGST applies to inter-state supplies as a single tax.
Which rates are included?
5%, 12%, 18%, and 28%, plus a custom percent you type.
Is this a tax filing tool?
No. It calculates amounts for estimates and invoices. File returns with your official records.
Is the amount uploaded?
No. The calculation stays in your browser.
Does it handle cess?
No. Add compensation cess separately if your product requires it.