Z

GST Calculator (India)

Add or remove GST (5%, 12%, 18%, 28%) on any amount, with CGST/SGST split — in your browser.

Runs in your browser — files never leave your device

Net
₹1,000
GST
₹180
CGST / SGST
₹90 each
Gross
₹1,180

How it works

This calculator works in both directions. In the default mode you enter a taxable value and a GST rate, and it adds tax on top: GST = amount × rate ÷ 100, and gross = amount + GST. If you tick “Amount already includes GST”, it extracts the tax from a gross figure instead: net = amount ÷ (1 + rate ÷ 100), and GST = amount − net. Either way it also splits the tax into equal CGST and SGST halves — the split that applies to intra-state supplies — and rounds every figure to the paisa (two decimals).

A worked example: you bill ₹25,000 for a service taxed at 18%. GST is 25,000 × 18 ÷ 100 = ₹4,500, so the invoice total is ₹29,500, shown as CGST ₹2,250 plus SGST ₹2,250 for a supply within one state. Running it backwards — ₹29,500 at 18% with the inclusive box ticked — returns the same numbers: net ₹25,000 and GST ₹4,500. The reverse calculation is the one people get wrong by hand: subtracting 18% of the gross (₹5,310) overstates the tax, because the 18% was charged on the net amount, not the gross.

The rate presets reflect GST 2.0, the slab overhaul effective 22 September 2025. As of July 2026 most goods and services fall in just two main slabs, 5% and 18% — the bulk of items previously at 12% moved to 5%, and most 28% items moved to 18%. A 40% demerit rate now applies to a short list including pan masala, tobacco products, aerated and caffeinated sugary drinks, luxury cars, yachts and betting or casino services, while many essentials (UHT milk, paneer, Indian breads) moved to 0% and individual life and health insurance premiums became exempt. The 12% and 28% presets are kept for legacy work — verifying invoices, credit notes or returns dated before 22 September 2025.

The CGST/SGST split shown applies to intra-state supplies, where the central and state governments take half each. For inter-state supplies the whole amount is levied as IGST at the same rate — use the single GST figure and ignore the split. Rate classification ultimately depends on the HSN/SAC code of the specific item, so treat these results as estimates and confirm the applicable rate on the CBIC or GST portal, or with your tax practitioner, before filing.

Frequently asked questions

Which GST rates apply as of 2026?
Under GST 2.0, effective 22 September 2025, most goods and services attract either 5% or 18%. A 40% demerit rate covers items such as pan masala, tobacco, aerated and caffeinated sugary drinks, luxury cars, yachts and betting or casino services, while many essentials moved to 0% and individual life and health insurance premiums are exempt. The old 12% and 28% slabs no longer apply to new supplies.
What are CGST, SGST and IGST?
When buyer and seller are in the same state, GST is collected as two equal halves: CGST for the centre and SGST for the state — an 18% charge becomes 9% + 9%. On inter-state supplies the full amount is charged as a single IGST instead. This tool shows the intra-state split; for an inter-state bill, use the total GST figure as the IGST.
How do I remove GST from a price that already includes it?
Tick “Amount already includes GST”. The tool divides the gross amount by (1 + rate ÷ 100) to recover the net value and reports the difference as GST — for example, ₹29,500 at 18% inclusive gives net ₹25,000 and GST ₹4,500. Simply taking 18% of ₹29,500 (₹5,310) would overstate the tax, because the rate was charged on the net, not the gross.
Why does the rate list still include 12% and 28%?
They are legacy slabs that applied before GST 2.0 took effect on 22 September 2025. You still need them to check older invoices, issue credit notes against pre-change bills or reconcile past returns. For current pricing, 5% and 18% cover most items.
Which items fall under the 40% rate?
The 40% demerit slab is deliberately narrow: pan masala, tobacco products, aerated and caffeinated sugary drinks, luxury cars, yachts, and betting, gambling and casino services. Everyday goods and services are unaffected by it.
Can I use these figures directly on a GST invoice?
The math matches standard practice — tax rounded to two decimals with an equal CGST/SGST split — but the rate that applies depends on the HSN/SAC classification of the exact item. Verify the rate on the CBIC/GST portal or with your tax practitioner before invoicing or filing; treat the results as estimates, not tax advice.
Is my billing data uploaded anywhere?
No. The calculation runs entirely in your browser — the amounts you type never leave your device.

Related tools