GST Calculator

Add GST to a base price or work out the GST already inside a total. See the CGST and SGST split for any Indian GST slab.

Mode

Rate

Base amount (₹)

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How to use gst calculator

Choose a mode
Add GST to a base price, or remove GST from a GST-inclusive total.
Pick the rate
Select a standard slab (5/12/18/28%) or enter a custom rate.
Calculate
Enter the amount and click Calculate to see the full breakdown.

Inclusive and exclusive

Handle both 'add GST' and 'GST already included' scenarios.

CGST/SGST split

Automatically halves total GST into CGST and SGST for intra-state billing.

All standard slabs

Supports 5%, 12%, 18%, 28% and a custom rate.

How is GST removed from an inclusive price?

Base = total × 100 ÷ (100 + rate). The GST is the difference between the total and that base amount.

What are CGST and SGST?

For sales within a state, GST is split equally into Central GST and State GST. For inter-state sales it's charged as a single IGST instead.

Can I use a non-standard rate?

Yes — choose Custom and type any percentage for special cases.