Goods & Services Tax (GST) Calculator
Quickly add or remove GST (CGST & SGST) tax percentage rates to find net price, gross price, and actual tax amount.
GST Calculation Breakdown
Understand the tax components of your commercial transactions:
Net / Base Price
The price of the item before adding GST tax.
GST Amount
The tax value (often split 50/50 into Central CGST and State SGST).
Gross Price
The final, invoice-ready cost inclusive of all GST taxes.
How is it calculated?
GST = Base \times \frac{Rate}{100} \quad | \quad Base = Gross \times \frac{100}{100 + Rate}Use the first formula to add GST to a base price. Use the second formula to remove/deduct GST from a gross retail price.
Worked Examples
Adding 18% GST to ₹10,000 Base Cost
For a base cost of ₹10,000, 18% GST adds ₹1,800 (split into ₹900 CGST and ₹900 SGST), resulting in a total retail price of ₹11,800.
Deducting 18% GST from ₹11,800 Retail Price
If a product retails at ₹11,800 inclusive of 18% GST, the original cost is ₹10,000, and the tax component is ₹1,800.
A Complete Guide to Goods & Services Tax (GST)
What is Goods & Services Tax (GST Tax)?
Goods and Services Tax (GST) is an indirect, multi-stage, destination-based tax levied on the supply of goods and services. Implemented in India on July 1, 2017, it replaced a host of central and state indirect taxes like VAT, Service Tax, Excise Duty, and Luxury Tax, bringing the entire nation under a unified "One Nation, One Tax" regime.
GST is structured into four primary tax slabs: 5%, 12%, 18%, and 28%. Business transactions are categorized as either intra-state (within the same state) or inter-state (between different states).
How to Use this GST Tax Calculator for Invoicing
This tool is designed for business owners, accountants, and consumers to quickly compute GST values. Select the tax rate slab (e.g., 18% for services and standard goods), enter the amount, and choose the tax mode:
Add GST: Calculates the tax amount and total gross price starting from the net base price.
Remove GST: Extracts the base price and tax component starting from a GST-inclusive gross retail price. This is highly useful for accounting and auditing.
The Math Behind GST Tax Additions and Deductions
To add GST to a base price, use this formula:
GST Amount = Base Price * (GST Rate / 100)
Gross Price = Base Price + GST Amount
To extract or remove GST from an inclusive retail price, the formula is:
Base Price = Gross Price / (1 + (GST Rate / 100))
GST Amount = Gross Price - Base Price
For example, if a product is priced at ₹1,180 inclusive of 18% GST, the base price is 1,180 / (1 + 0.18) = ₹1,000, and the GST amount is ₹180. The tax is split 50/50 into CGST (₹90) and SGST (₹90) for intra-state sales.
CGST Tax, SGST Tax, and IGST Tax Explained
GST is divided into three components based on supply geography:
CGST (Central GST): Collected by the Central Government on intra-state sales.
SGST (State GST): Collected by the State Government on intra-state sales. CGST and SGST are always levied in equal proportions (e.g., a 18% GST split is 9% CGST and 9% SGST).
IGST (Integrated GST): Collected by the Central Government on inter-state sales and imports, and then distributed to the consumption state.
Frequently Asked Questions
Who is required to register for GST in India?
What is the Input Tax Credit (ITC) in GST?
Is GST levied on all products in India?
Results are estimates and should not be considered financial advice.