GST Calculator
Calculate GST amount, net price, and gross price for any product or service.
What is GST?
Goods and Services Tax (GST) is a comprehensive indirect tax levied on the supply of goods and services in India. It was introduced on July 1, 2017, replacing multiple cascading taxes like VAT, Service Tax, Excise Duty, and others.
GST follows a dual model — both the Central and State governments levy tax simultaneously. This ensures a unified tax structure across the country, simplifying compliance and reducing the cascading effect of taxes.
GST Formula
GST Inclusive: Price = Total × 100 / (100 + Rate)
GST Exclusive (Adding GST):
- GST Amount = Original Price × GST Rate / 100
- Total Price = Original Price + GST Amount
- CGST = GST Amount / 2
- SGST = GST Amount / 2
GST Inclusive (Removing GST):
- Original Price = Total Price × 100 / (100 + GST Rate)
- GST Amount = Total Price – Original Price
💡 Note: For inter-state transactions, IGST is charged instead of CGST+SGST. The total rate remains the same.
Example Calculation
Example 1: Adding GST (Exclusive)
A product costs ₹10,000 and GST rate is 18%.
GST = 10,000 × 18/100 = ₹1,800
CGST = ₹900 | SGST = ₹900
Total = 10,000 + 1,800 = ₹11,800
Example 2: Removing GST (Inclusive)
A bill shows ₹11,800 inclusive of 18% GST. Find the base price.
Base = 11,800 × 100 / (100 + 18) = 11,800 / 1.18 = ₹10,000
GST = 11,800 - 10,000 = ₹1,800
Frequently Asked Questions
India has four main GST slabs: 5% (essential items like packaged food), 12% (processed food, mobiles), 18% (most goods and services, electronics), and 28% (luxury items, cars, tobacco). Some items like unbranded food grains are at 0%.
CGST + SGST are levied on intra-state transactions (within the same state). IGST is levied on inter-state transactions (between different states) and imports. The total tax rate remains the same — e.g., 18% can be split as 9% CGST + 9% SGST, or charged as 18% IGST.
GST Exclusive: The price shown does NOT include GST — tax is added on top. Common in B2B invoicing. GST Inclusive: The displayed price already includes GST — the MRP on products is inclusive of all taxes.
GST registration is mandatory for businesses with annual turnover exceeding ₹40 lakh (₹20 lakh for services, ₹10 lakh for special category states). E-commerce sellers, interstate suppliers, and casual taxable persons must register regardless of turnover.
ITC allows businesses to reduce the GST they owe by claiming credit for GST paid on purchases (inputs). For example, if you paid ₹1,800 GST on raw materials and collected ₹3,600 GST on sales, you only pay ₹1,800 (3,600 - 1,800) to the government.
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