How do I calculate GST on an amount?

To add GST: GST Amount = Amount × Rate ÷ 100, Total = Amount + GST. To remove GST from an inclusive amount: Original = Total × 100 ÷ (100 + Rate), GST = Total − Original.

What is the difference between CGST, SGST, and IGST?

For intra-state transactions (buyer and seller in same state), GST is split equally into CGST (Central GST) and SGST (State GST). For inter-state transactions, IGST (Integrated GST) is charged at the full rate and later distributed between centre and destination state.

What are the GST rate slabs in India?

India has five GST slabs: 0% (essentials like fresh food, health, education), 5% (packaged foods, medicines), 12% (processed foods, mobile phones), 18% (most services and electronics — the most common rate), and 28% (luxury goods, automobiles, tobacco).

How to find the original price after removing GST?

Original Price = GST-inclusive price × 100 ÷ (100 + GST Rate). For example, if an item costs ₹1,180 including 18% GST, the original price = 1180 × 100 ÷ 118 = ₹1,000.

All Tools

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GST Calculator India

Free to Use

Calculate GST in India instantly. Add or remove GST from any amount at 5%, 12%, 18%, 28% rates. CGST, SGST, and IGST breakdown.

Country

GST Scheme

Calculation Mode

GST Details

Amount (₹)

GST Rate

Calculation Type

Exclusive: amount is pre-GST. GST will be added on top.

Transaction Type

Intra-state: buyer and seller in same state. Inter-state: different states.

GST Breakdown

Original Amount (pre-GST)

₹10,000

GST Amount (18%)

₹1,800

CGST (9%)

₹900

SGST (9%)

₹900

Total Amount (incl. GST)

₹11,800

Amount Breakdown

Base Amount (Pre-GST)₹10,000 (84.7%)

CGST (9%)₹900 (7.6%)

SGST (9%)₹900 (7.6%)

Rate Comparison — ₹10,000

GST Rate	Pre-GST	GST Amount	Total
0%	₹10,000	₹0	₹10,000
5%	₹10,000	₹500	₹10,500
12%	₹10,000	₹1,200	₹11,200
18%← current	₹10,000	₹1,800	₹11,800
28%	₹10,000	₹2,800	₹12,800

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Reverse Charge Mechanism (RCM)

Under RCM, the recipient (buyer) pays GST directly to the government instead of the supplier. This is the reverse of the normal GST flow where the supplier collects and remits GST.

When RCM applies: (1) Purchases from unregistered suppliers above threshold; (2) Specified services like legal services from advocates, GTA freight, import of services; (3) Notified goods such as cashew nuts, silk yarn, tobacco leaves. Under RCM, you can claim ITC on the GST you self-remit, subject to normal ITC rules.

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GST Slab Summary

0% — Essential items: fresh food, health services, education
5% — Packaged foods, transport, medicines
12% — Processed foods, mobile phones, business class travel
18% — Most services, electronics, computers, software (most common)
28% — Luxury goods, automobiles, tobacco, aerated drinks

Frequently Asked Questions

Is this GST calculator free?›

Yes, it is completely free to use. No registration or payment is required. You can calculate GST for any amount and any rate instantly.

Which country's GST system does this calculator follow?›

This calculator is built for India's GST system. It supports all Indian GST rates (0%, 5%, 12%, 18%, 28%), splits tax into CGST + SGST for intra-state transactions and IGST for inter-state transactions, and also covers the Composition Scheme for small businesses.

How do I use the GST calculator?›

For a single item: enter the amount, select the GST rate (or choose Custom), pick "Add GST" or "Remove GST", and select Intra-state or Inter-state. The calculator instantly shows base amount, GST amount, CGST/SGST or IGST split, and the total. For multiple items, switch to "Multiple Items" mode, add up to 10 line items each with their own GST rate, and get the full invoice summary.

What does this calculator compute?›

It calculates GST-exclusive and GST-inclusive amounts, CGST/SGST breakdown (intra-state) or IGST (inter-state), supports all five GST slabs (0%, 5%, 12%, 18%, 28%) plus custom rates, handles multi-item invoices with mixed rates, computes Composition Scheme GST (1%, 5%, or 6% depending on business type), and provides a rate comparison table.

What is the difference between "Add GST" and "Remove GST"?›

"Add GST" (exclusive) means your entered amount is the base price before GST — the calculator adds GST on top. "Remove GST" (inclusive) means your entered amount already includes GST — the calculator extracts the base price and the GST component from the total. For example, if a product costs ₹1,000 excluding tax, use "Add GST". If the invoice total is ₹1,180 and you want to find the base amount, use "Remove GST".

What Is GST Calculator India?

A GST calculator helps businesses and individuals add or remove GST from any amount across all tax slabs. India's GST structure has five rates: 0%, 5%, 12%, 18%, and 28%, with different rates for goods, services, and composite dealers. Formly's free GST calculator handles both "add GST to base price" and "extract GST from inclusive price" in one click, with CGST + SGST breakdown for intra-state and IGST for inter-state transactions.

Why Formly's GST Calculator India Is the Best Free Option

✓Both add and remove GST — calculate either exclusive (base price + GST) or inclusive (total - GST) in one tool.
✓All GST slabs: 5%, 12%, 18%, 28%, and composition dealer rates.
✓CGST + SGST + IGST breakdown — correct for both intra-state and inter-state transactions.
✓Supports cess — additional cess on luxury goods and tobacco correctly applied.
✓Free and instant — no signup, no account, immediate results.
✓Invoice-ready values — output is formatted for entering into GST invoices.

Free Alternative to ClearTax GST calculator, Masters India GST calculator

→ClearTax GST calculator: ClearTax pushes GST filing services. Formly gives clean calculations with no upsell.

→Masters India GST calculator: Requires account for advanced features. Formly is free and fully functional.

Who Uses GST Calculator India?

Small business owners

Calculate GST on sales invoices and purchase receipts for GST-registered businesses.

Freelancers

Add 18% GST to service invoices when billing GST-registered clients.

Accountants

Quickly verify GST amounts on supplier invoices and client billing.

E-commerce sellers

Calculate GST on product prices for Flipkart, Amazon, and Meesho listings.

Consumers

Understand how much GST is included in the MRP of goods and services they purchase.

Popular searches: GST calculator India, add GST to price, remove GST from price, GST calculation online, CGST SGST calculator, GST inclusive exclusive calculator, GST amount calculator.

Looking for a detailed guide? Read our in-depth tutorial on using GST Calculator India for professional results.

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