Net price (to add) or gross price (to remove).
Applicable GST percentage.
Add to a net price or extract from a gross price.
GST Amount
$180.00
Net (excl. GST)
$1,000.00
Gross (incl. GST)
$1,180.00
CGST / SGST (each)
$90.00
Estimate only — not financial advice; lender terms, fees, and taxes vary. Read the full disclaimer ↓
How the amount splits into the net price, total GST, and the equal CGST and SGST shares, plus the gross total, for the rate and mode you chose.
| Component | Amount |
|---|---|
| Net (excl. GST) | $1,000 |
| GST (18%) | $180 |
| CGST (half) | $90 |
| SGST (half) | $90 |
| Gross (incl. GST) | $1,180 |
In add mode the amount is the net price and GST is added on top.
$1,000 net price with 18% GST (add mode).
Net
$1,000.00
GST (18%)
$180.00
Gross
$1,180.00
CGST / SGST
$90.00 each
Adding 18% GST to a $1,000 net price gives $180 of tax, split as $90 CGST and $90 SGST, for a $1,180 gross price.
Goods and Services Tax is a single consumption tax applied to most goods and services, charged as a percentage of the price and ultimately paid by the end consumer. This calculator helps whenever you need to move between a price without GST and a price with it, and to see how the tax divides between central and state shares.
It is useful for shopkeepers setting prices, buyers checking how much tax is in a total, and anyone preparing or reading an invoice. Enter the amount, the rate, and whether you are adding or removing GST, and the breakdown appears at once.
Adding GST is direct: multiply the net price by the rate to get the GST, then add it to the net for the gross. A $1,000 net price at 18% gains $180 of GST for a $1,180 gross total.
Removing GST needs care. Because the GST sits on top of the net, you divide the gross by one plus the rate to recover the net, then subtract to find the GST. Dividing $1,180 by 1.18 returns the original $1,000 net and $180 of GST.
For a sale within a single state, the total GST is shared equally between the central government, as Central GST, and the state government, as State GST. So 18% total GST becomes 9% CGST and 9% SGST, and the calculator shows each half.
For sales across state lines, a single Integrated GST applies instead and is not split at the invoice level. The split shown here therefore reflects the common intra-state case; the net, total GST, and gross figures still hold either way.
The most frequent error is confusing net and gross prices, which throws off every figure. Decide first whether your starting amount already includes GST before choosing add or remove mode.
Another is subtracting the rate from a gross price to remove GST, which always overstates the tax. Applying one rate to an invoice that mixes different rate slabs is a further common slip.
State clearly on quotes and invoices whether a price includes GST, and show the CGST and SGST separately where required, as most tax invoices do. This keeps your records clean and avoids disputes.
When an order contains items in different rate slabs, calculate each line on its own rather than blending rates. Keeping net, GST, and gross columns in your bookkeeping makes return filing much smoother.
This calculator applies a single rate to the whole amount, assumes an equal CGST/SGST split for intra-state supply, and shows exact figures. Real GST involves multiple rate slabs, exemptions, the inter-state IGST mechanism, input tax credits, and rounding rules.
It is a quick general-purpose tool, not tax software or advice. For filing, claiming input credits, or handling cross-border supplies, follow current rules and confirm the treatment with a qualified professional.
For sales within a state, GST is split equally into Central GST and State GST. Each is half of the total GST. For inter-state sales, a single Integrated GST (IGST) applies instead of the split.
Use remove mode: divide the gross price by 1 plus the rate to get the net price, then subtract the net from the gross to find the GST included. The tool does this automatically.
The split applies to intra-state supply, meaning the buyer and seller are in the same state. The GST is divided equally between the central and state governments. This calculator shows that even split.
IGST is the single tax charged on inter-state supplies and imports, collected by the central government and later shared with states. Because it is not divided at the invoice level, this calculator focuses on the CGST/SGST split for intra-state sales.
The GST was added to the net price, not the gross. Subtracting the rate from a gross figure overstates the tax, so you must divide by one plus the rate to recover the correct net first.
No. Different goods and services fall into different rate slabs, and some are exempt or zero-rated. Enter the rate that applies to your item; for a mixed invoice, calculate each line separately.
It shows precise figures. Actual tax invoices may apply rounding rules at the line or invoice level, so a real total can differ from this estimate by a small amount.
Figures on this page are checked against primary, authoritative sources. Links open in a new tab.
Tax disclaimer
Tax rules vary by country, state, tax year, filing status, income type, deductions, and exemptions. This calculator is educational and uses the values you enter. Always verify final tax treatment with official sources or a qualified tax professional.
Built and maintained by Calculator Matters, an independent calculator project. Method checked against published formulas and primary sources · Last reviewed 3 June 2026 · How we calculate · Found an error? corrections@calculatormatters.com