GST Calculator
Calculate GST inclusive and exclusive amounts instantly with all tax slabs
Net Amount
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GST Amount
₹0.00
Total Amount
₹0.00
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About GST Rates in India (FY 2025-26)
5%: Essential items (food grains, medicines)
12%: Processed foods, computers
18%: Most goods & services (default rate)
28%: Luxury items, automobiles, tobacco
Frequently Asked Questions
What is GST and how does it work in India?
GST (Goods and Services Tax) is an indirect tax levied on the supply of goods and services in India. It replaced multiple cascading taxes like VAT, excise duty, and service tax. GST is a destination-based tax that follows a multi-stage taxation system where tax is collected at every stage of the supply chain.
What are the different GST rates in India?
India has four main GST slabs: 5% (essential items like food grains, medicines), 12% (processed foods, computers), 18% (most goods and services - default rate), and 28% (luxury items, automobiles, tobacco). Some items like fresh produce, books, and newspapers are exempt (0% GST).
What is the difference between GST Inclusive and GST Exclusive?
GST Exclusive means the tax is added on top of the base price (e.g., ₹100 + 18% GST = ₹118 total). GST Inclusive means the tax is already included in the total price (e.g., ₹118 includes ₹100 base + ₹18 GST). Retailers typically show prices as GST inclusive, while B2B transactions use GST exclusive pricing.
How do I calculate GST backwards from the total amount?
To extract GST from an inclusive amount, use the formula: GST Amount = (Total Amount × GST Rate) / (100 + GST Rate). For example, for ₹118 at 18% GST: GST = (118 × 18) / 118 = ₹18, and Net Amount = ₹100.
Do I need to register for GST?
GST registration is mandatory if your annual turnover exceeds ₹40 lakhs for goods (₹20 lakhs for special category states) or ₹20 lakhs for services. Inter-state suppliers, e-commerce sellers, and certain specified businesses must register regardless of turnover.
What is CGST, SGST, and IGST?
CGST (Central GST) and SGST (State GST) apply to intra-state transactions, with tax revenue split between central and state governments. IGST (Integrated GST) applies to inter-state transactions, with the central government collecting the full tax and later distributing it to destination states.
How to Use This Calculator
- 1
Enter the amount in the input field (this can be either the base amount or total amount depending on your calculation type).
- 2
Select the applicable GST rate from the four tax slabs: 5%, 12%, 18%, or 28% based on your product or service category.
- 3
Choose the calculation type: 'GST Exclusive' to add tax to the amount, or 'GST Inclusive' to extract tax from the total.
- 4
View the instant results showing Net Amount (before tax), GST Amount (tax value), and Total Amount (final price).
Key Terms & Definitions
- GST (Goods and Services Tax)
- A comprehensive indirect tax on the manufacture, sale, and consumption of goods and services throughout India, replacing multiple cascading taxes.
- Net Amount
- The base price of goods or services before adding GST. This is the taxable value on which GST is calculated.
- GST Amount
- The actual tax value calculated by applying the GST rate percentage to the net amount.
- GST Exclusive
- A pricing method where GST is added on top of the base price. The displayed price does not include tax.
- GST Inclusive
- A pricing method where GST is already included in the displayed price. Common in retail for consumer-facing prices.
- GSTIN
- GST Identification Number - a unique 15-digit number assigned to every taxpayer registered under GST in India.
Formulas & Calculations
GST Exclusive Calculation
When calculating GST exclusive, you start with the base price (net amount) and add the GST on top. For example, ₹1000 at 18% GST = ₹1000 + (₹1000 × 0.18) = ₹1,180 total.
GST Inclusive (Reverse) Calculation
When calculating GST inclusive, you extract the tax from the total amount. For example, ₹1,180 at 18% GST = ₹1,180 × 100 / 118 = ₹1,000 net, GST = ₹180.
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