Split as CGST ₹900.00 + SGST ₹900.00 (half each).
GST 2.0 (from 22 September 2025) uses four slabs: 0%, 5%, 18%, and 40%. The old 12% and 28% slabs were abolished - most 12% items moved to 5% or 18%, and most 28% items to 18%, with 40% reserved for sin and luxury goods. Which slab a product falls under is set by the GST Council; check the CBIC rate schedule if unsure. Not tax advice.
Online GST Calculator for India
The Tools Kit’s free GST Calculator India adds GST to a base price or extracts it from a GST-inclusive amount, then shows how the tax splits into CGST and SGST for an intra-state sale or a single IGST line for an inter-state sale. It uses the GST 2.0 slabs in force since 22 September 2025 — 0%, 5%, 18% and 40% — and formats every figure in rupees with Indian lakh and crore grouping, rounded to the paisa.
GST = base price × rate ÷ 100. Total = base price + GST. On a ₹10,000 intra-state sale at 18%, GST is ₹1,800 — ₹900 CGST plus ₹900 SGST — for a total of ₹11,800.
How to Use the GST Calculator
- 1
Choose the mode
Select "Add GST to a base price" if your figure excludes tax, or "Extract GST from a GST-inclusive price" if it already includes GST, such as an MRP or an invoice total.
- 2
Pick the GST rate
Choose the slab for your goods or service: 5%, 18% (the standard rate), 40% for sin and luxury goods, or 0% for exempt and nil-rated supplies.
- 3
Set the supply type
Pick intra-state for a sale within one state (CGST + SGST) or inter-state for a sale between states (IGST).
- 4
Enter the amount in rupees
Type the base price or the GST-inclusive price. Commas and the rupee sign are allowed, so 5,00,000 or ₹5,00,000 works as well as 500000. A negative price shows an error.
- 5
Read the breakdown
The base price, GST amount, total price and the CGST/SGST or IGST split update instantly, rounded to the paisa.
The calculation runs entirely in your browser, with no account and no limit on how many prices you check.
GST Formula: Adding and Removing GST
Adding GST (exclusive price): multiply the base price by the rate and add the result. ₹2,000 at 5% carries ₹100 of GST, for a total of ₹2,100. At the 40% slab, a ₹5,00,000 inter-state sale carries ₹2,00,000 of IGST, for a total of ₹7,00,000.
Removing GST (inclusive price): divide the inclusive amount by 1 plus the rate to find the base price, and the difference is the GST. For ₹25,000 inclusive of 18% GST, the base price is ₹25,000 ÷ 1.18 = ₹21,186.44 and the GST inside is ₹3,813.56 (₹1,906.78 CGST + ₹1,906.78 SGST within a state). This is the reverse GST calculation used to check an MRP, a restaurant bill or a supplier’s quote. Because the figures are worked out to the paisa, the base and the GST always add back to exactly the inclusive amount you typed.
A common mistake is to take 18% of the inclusive total. On ₹11,800, that gives ₹2,124, when the GST actually inside the price is ₹1,800. The tax is always a percentage of the base price, which is why the extract mode divides rather than subtracts. The same logic sits behind any percentage increase or decrease, and it is why a shop’s discount on a GST-inclusive price also reduces the tax inside it.
GST Rates in India After GST 2.0
The GST 2.0 reform, effective 22 September 2025, replaced the old five-slab structure with four main rates. The 12% and 28% slabs were abolished: most 12% items moved to 5% or 18%, and most 28% items moved to 18%.
- 0% — exempt and nil-rated supplies.
- 5% — essentials and most items that were previously taxed at 12%.
- 18% — the standard rate for most goods and services.
- 40% — a special rate for sin and luxury goods.
Which slab applies to a particular product or service is set by the GST Council and published in the CBIC rate schedule; the calculator does the arithmetic once you know the rate. It covers GST only, so any separate cess must be added on top. GST is also charged on services such as a bank’s loan processing fee, so factor it in when you compare loans with the EMI calculator. If you also bill customers in the UK or Europe, the VAT calculator adds and removes VAT with the same inclusive and exclusive logic.
CGST, SGST and IGST: Intra-State vs Inter-State Sales
Every GST charge is either split or single, depending on where the supply takes place. When the supplier and the place of supply are in the same state, the tax is split equally into CGST, collected by the centre, and SGST (or UTGST in a union territory), collected by the state. When the GST comes to an odd number of paise, the calculator gives the extra paisa to CGST so that CGST and SGST together equal the GST line exactly. When they are in different states, or on imports, the full rate is charged as IGST.
| GST slab | Intra-state split | Inter-state | GST on ₹10,000 |
|---|---|---|---|
| 5% | 2.5% CGST + 2.5% SGST | 5% IGST | ₹500 |
| 18% | 9% CGST + 9% SGST | 18% IGST | ₹1,800 |
| 40% | 20% CGST + 20% SGST | 40% IGST | ₹4,000 |
The total tax is identical either way; what changes is how it appears on the tax invoice. Once you have the right split, you can lay it out on a bill with the free invoice generator.
Common uses
- Preparing a GST invoice with the correct CGST/SGST or IGST lines
- Checking how much GST is included in an MRP, restaurant bill or retail receipt
- Quoting GST-exclusive and GST-inclusive prices to B2B and retail customers
- Comparing what an item costs at 5% versus 18% after the GST 2.0 reclassification
- Reconciling supplier invoices before recording input tax
GST is an indirect tax on what you buy and sell; for the direct tax on your salary, use the India income tax calculator or turn a package into monthly pay with the CTC to in-hand calculator. More money tools are collected on the calculators page.
GST terms explained
| Term | What it means here |
|---|---|
| GST | Goods and Services Tax, the single indirect tax on most supplies of goods and services in India |
| CGST | Central GST: the half of the tax on an intra-state sale that goes to the central government |
| SGST / UTGST | State GST (or Union Territory GST): the other half of the tax on an intra-state sale |
| IGST | Integrated GST: the full rate charged as one line on inter-state sales and imports |
| Base price / taxable value | The price before GST, on which the tax is calculated |
| GST-inclusive price | A price that already contains GST, such as most MRPs and retail bills |
| Slab | One of the fixed GST rates; under GST 2.0 these are 0%, 5%, 18% and 40% |
| Place of supply | The location rules that decide whether a sale is intra-state or inter-state |
Frequently Asked Questions
Multiply the base price by the GST rate: GST = price × rate ÷ 100, then add it to the price for the total. ₹10,000 at 18% gives ₹1,800 of GST and a total of ₹11,800. The calculator does this instantly in "Add GST" mode.
Divide the inclusive amount by 1 plus the rate to get the base price, then subtract that from the total. ₹11,800 at 18%: ₹11,800 ÷ 1.18 = ₹10,000 base, so the GST inside is ₹1,800. Use "Extract GST" mode to do this automatically.
Because GST is charged on the base price, not on the total. Taking 18% of ₹11,800 gives ₹2,124, which overstates the tax. The correct GST inside ₹11,800 at 18% is ₹1,800, found by dividing by 1.18.
Since GST 2.0 took effect on 22 September 2025 there are four main slabs: 0% for exempt and nil-rated items, 5% for essentials and most former 12% items, 18% as the standard rate for most goods and services, and 40% for sin and luxury goods. These are the four rates the calculator offers.
They were removed in the GST 2.0 reform. Most items previously at 12% moved to 5% or 18%, and most 28% items moved to 18%, with sin and luxury goods going to the new 40% rate. If you are still quoting 12% or 28%, check the current CBIC rate schedule for your item.
On a sale within one state, GST is split equally: half is CGST for the centre and half is SGST for the state, so 18% becomes 9% + 9%. On a sale between states, the full rate is charged as a single IGST line. The total tax is the same either way.
Each takes half of the GST. On ₹10,000 at 18% intra-state, the ₹1,800 of GST splits into ₹900 CGST and ₹900 SGST. If the GST ends in an odd paisa, CGST takes the extra paisa so the two lines add up to the GST exactly. Select "Intra-state" to see this split.
Charge IGST when the supplier and the place of supply are in different states, such as a seller in Maharashtra invoicing a buyer in Karnataka, and on imports. Charge CGST plus SGST when both are in the same state. Select "Inter-state" in the calculator to see the amount as a single IGST line.
₹2,000 × 5% = ₹100 of GST, for a total of ₹2,100. Intra-state, that is ₹50 CGST and ₹50 SGST; inter-state, it is ₹100 IGST.
No. It calculates GST only, at the 0%, 5%, 18% or 40% slab you choose. It has no cess field and no custom-rate input, so add any other levy separately.
No. The calculation runs entirely in your browser, and nothing you type is uploaded. There is no signup and no limit on how many calculations you run.
This calculator is for estimates and invoicing arithmetic, not tax advice. Confirm the rate for your goods or services with the CBIC schedule or a tax professional.
Reviewed by Raja Jahangir · Last reviewed: October 2026
How do you calculate GST in India?
To calculate Indian GST, multiply the base price by the slab rate: ₹10,000 at 18% adds ₹1,800 for a total of ₹11,800. On an intra-state sale that tax splits equally into ₹900 CGST and ₹900 SGST; on an inter-state sale it is charged as a single ₹1,800 IGST line. GST 2.0 slabs are 0%, 5%, 18%, and 40%.
What is the difference between CGST, SGST and IGST?
CGST and SGST are the central and state halves of GST charged on a sale within one state, each taking exactly half the rate, so 18% becomes 9% plus 9%. IGST is the full rate charged as a single line on sales between states or on imports, collected centrally and shared with the destination state.
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