GST Calculator India (2026) - Inclusive & Exclusive GST Calculator
Quick Answer
To calculate GST, multiply the taxable amount by the GST rate and divide by 100. For a GST inclusive price, divide the total by (100 + rate) and multiply by 100 to get the taxable value. Intra-state supplies split the tax equally into CGST and SGST, while inter-state supplies are charged as IGST.
TL;DR
- GST Amount = Taxable Amount x GST Rate / 100 (exclusive pricing).
- Taxable Amount = Total x 100 / (100 + GST Rate) (inclusive pricing).
- Intra-state: CGST and SGST are half the GST each.
- Inter-state: the full GST is charged as IGST.
- Indian GST slabs are 0%, 3%, 5%, 12%, 18% and 28%.
Calculate GST instantly with StatementLab's free GST Calculator India. Easily calculate Inclusive & Exclusive GST, CGST, SGST and IGST with live results, formulas, examples and accurate calculations. No signup required.
What is GST?
GST (Goods and Services Tax) is India's single indirect tax on the supply of goods and services, introduced on 1 July 2017. It replaced VAT, service tax, excise duty and a long list of state levies with one destination-based tax charged at every stage of the supply chain, with credit for tax already paid on inputs.
GST slabs in India
Every taxable supply falls into a notified slab. Essentials sit at the lower end, standard goods and services at 18%, and luxury or demerit items at the top.
- 0%: unbranded food grains, fresh produce, most healthcare and education services.
- 3%: gold, silver, and other precious metals and jewellery.
- 5%: packaged food staples, economy transport, small restaurants, life-saving drugs.
- 12%: processed food, business-class air travel, mobile phone accessories, some apparel.
- 18%: the standard rate, covering most services, software, electronics and consulting.
- 28%: automobiles, aerated drinks, tobacco and other luxury or demerit goods (cess may apply).
CGST, SGST and IGST explained
The tax you pay is the same either way. Only the split changes, based on whether the supplier and the place of supply are in the same state.
- CGST (Central GST): the central government's half of an intra-state supply.
- SGST (State GST): the state government's half of the same intra-state supply.
- IGST (Integrated GST): the full tax on an inter-state supply, collected by the centre and later apportioned to the destination state.
- Example: 18% GST on ₹1,000 inside one state is CGST ₹90 + SGST ₹90. Across states it is IGST ₹180.
Inclusive GST vs exclusive GST
GST exclusive means the price you quote is before tax, so GST is added on top - common in B2B invoices. GST inclusive means the price already contains the tax, which is how most retail MRP and consumer bills are printed. Choosing the wrong mode is the single most common GST calculation mistake.
- Exclusive: ₹1,000 at 18% becomes ₹1,180 payable, with GST of ₹180.
- Inclusive: ₹1,180 at 18% already contains GST of ₹180 on a taxable value of ₹1,000.
GST calculation formula
Both directions come from the same relationship between taxable value, rate and total.
- GST Amount = Taxable Amount x GST Rate / 100
- Total Amount = Taxable Amount + GST Amount
- Taxable Amount (from an inclusive price) = Total Amount x 100 / (100 + GST Rate)
- GST Amount (from an inclusive price) = Total Amount - Taxable Amount
- CGST = SGST = GST Amount / 2 for intra-state supplies; IGST = GST Amount for inter-state supplies.
Who should use this GST calculator
Anyone who has to quote, verify or reconcile a tax-inclusive figure quickly.
- Business owners preparing quotations and tax invoices.
- Chartered accountants and tax consultants checking client figures.
- Freelancers and consultants raising GST invoices to Indian clients.
- Ecommerce sellers working backwards from a listed MRP.
- Buyers verifying the GST printed on a bill before paying it.
Frequently Asked Questions
How do I calculate GST on an amount?
Multiply the taxable amount by the GST rate and divide by 100. For example, 18% GST on ₹1,000 is 1000 x 18 / 100 = ₹180, making the total ₹1,180.
How do I calculate 18% GST?
For an exclusive price, multiply by 0.18 and add it to the amount. For an inclusive price, divide the total by 1.18 to get the taxable value and subtract it from the total to get the GST.
What is the GST on ₹100?
At 5% the GST is ₹5 (total ₹105), at 12% it is ₹12 (total ₹112), at 18% it is ₹18 (total ₹118) and at 28% it is ₹28 (total ₹128).
What is the GST on ₹500?
At 5% the GST is ₹25 (total ₹525), at 12% it is ₹60 (total ₹560), at 18% it is ₹90 (total ₹590) and at 28% it is ₹140 (total ₹640).
What is the GST on ₹1000?
At 5% the GST is ₹50 (total ₹1,050), at 12% it is ₹120 (total ₹1,120), at 18% it is ₹180 (total ₹1,180) and at 28% it is ₹280 (total ₹1,280).
What is the GST on ₹5000?
At 5% the GST is ₹250 (total ₹5,250), at 12% it is ₹600 (total ₹5,600), at 18% it is ₹900 (total ₹5,900) and at 28% it is ₹1,400 (total ₹6,400).
What is the GST on ₹10000?
At 5% the GST is ₹500 (total ₹10,500), at 12% it is ₹1,200 (total ₹11,200), at 18% it is ₹1,800 (total ₹11,800) and at 28% it is ₹2,800 (total ₹12,800).
What is the GST inclusive formula?
Taxable Amount = Total Amount x 100 / (100 + GST Rate). The GST is then the total minus that taxable amount.
What is the GST exclusive formula?
GST Amount = Taxable Amount x GST Rate / 100, and the Total Amount is the taxable amount plus that GST.
What is the difference between inclusive and exclusive GST?
An exclusive price is quoted before tax and GST is added on top. An inclusive price already contains the tax, so the GST has to be extracted from it using the reverse formula.
About this page
Built and reviewed by the StatementLab product team, an Indian financial-document engineering team. Formulas follow the GST rates notified by the CBIC and are verified by an automated test suite covering every slab, custom rates and inclusive-exclusive round trips. Last reviewed September 2026.