GST Calculator — Free Online

Why use GST Calculator?

India's GST system has multiple slabs (0%, 3%, 5%, 12%, 18%, 28%) and you often need to switch between inclusive and exclusive prices for invoicing. This calculator handles both directions instantly and shows the CGST/SGST split for intra-state transactions.

How it works

Enter the amount — Either pre-tax or tax-inclusive.
Pick the GST slab — Standard rates are pre-loaded.
Choose Add or Remove — "Add" treats input as base; "Remove" treats input as total.

Tips & best practices

For intra-state sales, GST splits 50/50 into CGST and SGST.
For inter-state sales, the full amount is IGST instead.
Most services fall under 18%; essentials are 5% or exempt.

Frequently asked questions

Which GST rate applies to my product?+

Check the official HSN/SAC code on the GST portal. Common rates: 5% (essentials), 12%, 18% (most services), 28% (luxury).

What is the difference between CGST and SGST?+

Central and State GST — each is half of the total GST for intra-state transactions.

Is IGST the same total amount?+

Yes — for inter-state sales, you pay one combined IGST instead of CGST + SGST.

Does this calculator include cess?+

No. Compensation cess on luxury items (cars, tobacco) must be added separately.