GST calculator
Add or remove GST in a tap. Enter an amount and rate to get the GST, the total, and the CGST/SGST split - for any slab from 5% to 28%.
GST details
Tweak the numbers - results update live
₹10K
Base amount
before GST
₹1.8K
GST
18% tax
₹11.8K
Total
incl. GST
Tax split (intra-state)
For a sale within your state, GST divides equally into CGST and SGST.
CGST (9%)
₹900
SGST (9%)
₹900
For an inter-state sale, the same total is charged as a single IGST of 18% instead.
Base vs GST
How the total breaks down
- Base amount₹10K
- GST₹1.8K
Total incl. GST
₹11,800
One tax, one nation
Add it on, or pull it out
GST is a percentage added to the value of most goods and services. Whether you’re pricing a product or reverse-engineering the tax inside a bill, the maths is a single multiply or divide.
Add: total = amount × (1 + rate/100)
- 1
Pick a slab
GST applies at 0, 5, 12, 18 or 28% depending on the item.
- 2
Add to the base
For pricing, GST is added on top of your base amount.
- 3
Or strip it out
“Remove GST” extracts the tax already inside an inclusive price.
- 4
Split intra-state
Within a state, GST divides equally into CGST and SGST.
Questions
Frequently asked
To add GST, multiply the base amount by the GST rate: GST = amount × rate ÷ 100, and total = amount + GST. To remove GST from a GST-inclusive price, divide: base = inclusive amount ÷ (1 + rate ÷ 100), and GST = inclusive amount − base. This calculator does both with one toggle.
GST has five main rates: 0%, 5%, 12%, 18% and 28%. Essentials are taxed at 0% or 5%, standard goods and services mostly at 12% or 18%, and luxury or sin goods at 28% (sometimes with an additional cess). Pick the slab that applies to your product or service.
For a sale within the same state (intra-state), GST splits equally into CGST (central) and SGST (state) - so 18% becomes 9% + 9%. For a sale between states (inter-state), the same total is charged as a single IGST. The total tax is identical; only the split differs.
Switch the calculator to “Remove GST” and enter the GST-inclusive price. It back-calculates the base amount and the GST component. For example, a ₹1,180 price at 18% GST contains ₹1,000 of base value and ₹180 of GST.
Businesses with annual turnover above ₹40 lakh for goods (₹20 lakh for services, lower in special-category states) must register for GST, along with e-commerce sellers and inter-state suppliers regardless of turnover. Registered businesses collect GST and can claim input tax credit.