Free GST Calculator
Compute GST liability for goods and services in India. Pick any standard slab (0, 0.25, 3, 5, 12, 18, 28 percent) plus optional compensation cess, choose intra-state (CGST + SGST split) or inter-state (IGST), and either add GST to a base amount or extract GST from an inclusive total. Multi-line invoice mode lets you mix slabs across line items and produces a grand total with the correct CGST / SGST / IGST split.
Same state = CGST 50% + SGST 50%. Different states = IGST 100%.
How to use
- 01Pick "Single line" for one calculation, or "Multi-line invoice" to add several items.
- 02Choose intra-state (same state seller and buyer) or inter-state (different states).
- 03For single line: choose direction. "Add GST" treats the input as the base amount and adds GST on top. "Extract GST" treats the input as the GST-inclusive total and works backwards to base + GST.
- 04Pick a slab. Hover any slab to see what kind of goods and services typically fall under it.
- 05For 28% only: optionally add compensation cess (luxury, tobacco). Some products attract additional cess on top of the standard rate.
FAQ
When is it CGST + SGST vs IGST?▼
If buyer and seller are in the same Indian state, the GST splits 50/50 into CGST (Central) and SGST (State). If they are in different states, the entire GST is IGST (Integrated GST), which the central government later distributes to the destination state.
What is "extract GST"?▼
You have a final amount inclusive of GST and want to know the base price and tax separately. For example, ₹118 inclusive at 18% GST means base ₹100 and GST ₹18. The math is: base = total / (1 + rate).
What is compensation cess?▼
A surcharge on top of GST for certain "demerit" or luxury goods (tobacco, aerated drinks, certain motor vehicles, coal). The rate varies by HSN code. The 28% slab is most often paired with cess, though the actual cess varies.
Are the slab labels guaranteed correct?▼
They reflect the major categories at each slab and are intended as guidance, not a substitute for the official HSN code lookup. Goods can move between slabs through GST Council decisions, and the exact slab for a specific product may differ. Always check the official notification for the HSN code you are billing.
Can I save the invoice?▼
Click "Copy report" on the result card. The copied text includes the breakdown and is paste-able into a ticket, email, or invoice template.