How do I calculate GST on an amount?

Enter the base amount, choose the GST rate, keep Tax Inclusion set to Exclusive, and the calculator will show the GST amount, CGST, SGST, and total payable instantly.

How do I remove GST from a total amount?

Select Inclusive mode, enter the total amount, and the calculator will reverse the tax to show the base price and GST amount separately.

What GST rates can I calculate with this tool?

You can calculate GST using common Indian GST slabs including 0%, 5%, 18%, and 40%, along with custom GST rates.

What is GST and when was it introduced in India?

GST stands for Goods and Services Tax. It is a unified indirect tax levied on goods and services across India. GST replaced multiple indirect taxes and came into effect on 1 July 2017.

What are the current GST slabs in India?

The major GST slabs in India are 0%, 5%, 18%, and 40%, depending on the category of goods or services.

What is the difference between direct tax and GST?

Direct taxes are levied directly on income or profits, while GST is an indirect tax levied on the consumption of goods and services and ultimately borne by the end consumer.

What is a GSTIN and how do I get one?

GSTIN is a 15-digit GST identification number assigned to registered businesses in India. You can obtain one by registering on the GST portal with your PAN, Aadhaar, business address proof, and bank account details.

What is the GST composition scheme?

The Composition Scheme is a simplified GST option for eligible small businesses that pay tax at a fixed percentage of turnover and cannot collect GST from customers or claim Input Tax Credit.

What is the reverse charge mechanism (RCM) under GST?

Under RCM, the recipient of goods or services pays GST directly to the government instead of the supplier. It applies in notified cases such as services from advocates, GTA services, imports of services, and purchases from unregistered suppliers in specified situations.

What GST returns does a regular taxpayer need to file?

Regular GST taxpayers generally file GSTR-1 for outward supplies, GSTR-3B for tax payment, and annual returns such as GSTR-9 where applicable, with filing frequency depending on turnover and scheme.

What is an e-invoice and who needs to generate it?

An e-invoice is a GST invoice authenticated electronically by the Invoice Registration Portal and assigned an IRN. It applies to businesses that meet the notified turnover threshold.

How much is 18% GST on ₹1000?

18% GST on ₹1000 is ₹180, making the total amount ₹1180.

What is a GST inclusive price?

A GST inclusive price already contains GST within the displayed amount. The GST amount must be extracted from the total.

GST Calculator Online
Calculate GST Instantly

Free GST calculator to add or remove GST, see CGST, SGST & IGST breakup,
and reverse calculate inclusive prices in seconds

Amount

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GST Rate

Tax Inclusion

Quick GST Picks

₹0.00

Actual Amount

₹0.00

GST Amount

₹0.00

Total Amount

SGST

₹0.00

CGST

₹0.00

What is GST, types and and Tax Structure in India?

Goods and Services Tax (GST) is a comprehensive, multi-stage, destination-based tax levied on every value addition across the supply chain in India. You can calculate this GST amount with all CGST, SGST and IGST breakdown from our GST Calculator tool. It came into effect on 1 July 2017, replacing a complex web of more than 17 indirect taxes including VAT, Service Tax, Central Excise Duty, and others.

GST is administered by the GST Council and the Central Board of Indirect Taxes and Customs (CBIC). As of 2026, over 1.4 crore businesses are registered under GST in India, making it one of the largest indirect tax reforms in the world. The most recent update popularly called GST 2.0 came into effect on 22 September 2025, simplifying the earlier four-tier slab system into three main rates (5%, 18%, and 40%) plus a 0% exempt category.

A key feature of GST is the Input Tax Credit (ITC) mechanism, which eliminates the cascading effect ("tax on tax") that plagued the earlier indirect tax regime. Businesses can claim credit for the GST paid on inputs and offset it against their output GST liability, ensuring the tax is ultimately borne only by the final consumer.

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CGST - Central GST

Collected by the central government on intra-state transactions. Split equally with SGST.

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SGST - State GST

Collected by the state government on intra-state sales. Equal share with CGST.

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IGST - Integrated GST

Applies to inter-state transactions and imports. Collected by the centre and shared with states.

How to Calculate GST Online Using This GST Calculator (Step-by-Step)

Our free online GST calculator helps you compute Goods and Services Tax instantly, without any manual formulas. Whether you're a business owner preparing invoices, a freelancer quoting clients, an accountant verifying tax computations, or an e-commerce seller setting product prices, this step-by-step GST calculation tool delivers accurate results in under 30 seconds.

Use this GST calculator online to compute CGST, SGST, and IGST for invoices, price quotes, and tax-inclusive MRP values.

Choose Add GST or Remove GST

Select Exclusive if you have the base price. Select Inclusive to reverse-calculate from an MRP or invoice total.

Enter the Amount in Rupees

Type the price of the goods or service. The calculator handles paise accurately.

Select the GST Slab

Pick from the GST 2.0 rates — 0%, 5%, 18%, or 40% — using the quick-select buttons, or type any custom GST rate for legacy 12% / 28% calculations or special rates.

Choose Tax Inclusion

Exclusive adds GST on top of your base price. Inclusive extracts the tax from the total.

Read Your Instant Results

The calculator instantly displays the base/taxable value, GST amount, CGST and SGST split (for intra-state transactions), and the total payable invoice value all updated in real time as you type.

GST Calculation Formula: How this GST Calculator Works

Understanding the underlying GST calculation formula helps you verify invoices, spot billing errors, and compute tax manually when needed. There are three standard formulas used in GST calculations for adding GST, removing GST (reverse GST), and splitting GST into CGST + SGST or IGST components.

When adding GST to a base price (exclusive)

GST Amount = Base Price × (GST Rate / 100)
Total Price = Base Price + GST Amount

When removing GST from an MRP (inclusive)

Base Price = Total Price / (1 + GST Rate / 100)
GST Amount = Total Price − Base Price

For intra-state transactions

CGST = GST Amount / 2
SGST = GST Amount / 2

💡 Our GST calculator automates all four formulas. Just enter the amount, pick the slab, and toggle between Inclusive and Exclusive modes for instant results.

GST Rates Supported by This Calculator

Following the GST 2.0 reforms effective 22 September 2025, the Indian GST slab structure has been simplified from four tiers (5%, 12%, 18%, 28%) into three main rates plus a 0% exempt category. This GST calculator supports all current and legacy slabs. Each rate applies based on the product or service category as classified under the HSN (Harmonised System of Nomenclature) code for goods or SAC (Services Accounting Code) for services.

Rate	Category	Common Examples
5%	Basic necessities	Packaged food (ghee, butter, cheese), pulses, tea, coffee, spices, diagnostic kits, agricultural equipment, garments up to ₹2,500
18%	Consumer durables & services	Home appliances, mobile phones, personal care, most standard services, and many consumer products
40%	Premium and high-tax items	Luxury or sin goods and other high-tax categories where this rate applies

* Rates are indicative. Always verify the exact HSN/SAC code classification on the official CBIC portal before filing returns.

GST Inclusive vs. GST Exclusive
What's the Difference?

This is one of the most common sources of confusion among business owners, especially when creating invoices or quoting prices.

GST Exclusive (Add GST)

The price you quote does not include GST. GST is added on top. This is common in B2B transactions where the buyer can claim input tax credit.

Example: ₹10,000 + 18% GST = ₹11,800 payable

GST Inclusive (Remove GST)

The price already includes GST. This is what consumers see on MRP tags and receipts in retail stores.

Example: ₹11,800 MRP → Base = ₹10,000 + Tax = ₹1,800

Input Tax Credit (ITC)
How It Works

One of the most powerful features of GST is the Input Tax Credit mechanism. Businesses registered under GST can deduct the tax they have already paid on purchases from their GST liability on sales.

For example, if you paid ₹1,800 in GST when purchasing raw materials, and collected ₹3,600 in GST from your customers on sales, you only remit the difference - ₹1,800 - to the government. This prevents the cascading effect of "tax on tax" that existed under the older indirect tax regime.

ITC is available for most business inputs but cannot be claimed on certain items like food and beverages (unless in the restaurant business), employee welfare expenses, motor vehicles for personal use, and works contract services related to immovable property.

Latest GST Updates 2026 GST 2.0 Reforms Explained

Effective 22 September 2025, the Government of India announced sweeping reforms to the GST structure — popularly referred to as GST 2.0. Here are the key changes that affect how this calculator works in 2026:

Slab simplification: The earlier four-tier system (5%, 12%, 18%, 28%) was replaced with three main slabs — 5%, 18%, and 40% — plus a 0% exempt category. The 12% and 28% slabs were largely merged into 18% and 40% respectively.
Insurance now exempt: Life insurance and health insurance premiums have been moved to the 0% GST slab, providing direct relief to households.
Reclassification of essentials: Several daily-use items including packaged food, soaps, toothpaste, and medicines moved from 12% to 5%.
Sin and luxury goods reorganised: Tobacco products, pan masala, aerated drinks, and premium SUVs now attract the 40% rate.
E-invoicing expansion: The mandatory e-invoicing threshold continues at ₹5 crore aggregate turnover, with stricter validation rules on IRN generation.

This calculator is fully updated for the GST 2.0 rates. For the latest CBIC notifications and rate revisions, visit the official CBIC GST portal.

Frequently Asked Questions about GST Calculator

GST stands for Goods and Services Tax. It is a single, unified indirect tax levied on the supply of goods and services across India. It replaced a fragmented system of over 17 central and state taxes - including VAT, Service Tax, Central Excise, and Entry Tax - and came into effect on 1 July 2017. GST follows a dual structure where both the central and state governments levy tax on the same transaction, collected as CGST + SGST (intra-state) or IGST (inter-state).

You can calculate GST easily by entering the base amount, choose the GST rate, and keep Tax Inclusion set to Exclusive. The calculator tool will add GST and show the CGST, SGST, and total payable instantly.

In the GST Caclulator, switch Tax Inclusion to Inclusive, enter the total amount, and the calculator will reverse the GST to show the base amount and tax split separately.

You can calculate GST at all supported and custom rates in this calculator:

This calculator is configured for the supported GST rates of 5%, 18%, and 40% with an additional exempted tax of 0%.

Direct taxes (like Income Tax and Corporate Tax) are levied directly on a person's or entity's income or profits and cannot be passed on to someone else. GST is an indirect tax - it is levied on the consumption of goods and services, collected by the seller, but ultimately borne by the end consumer. While direct taxes are administered by the Income Tax Department, GST is administered by the GST Council and the CBIC (Central Board of Indirect Taxes and Customs).

GSTIN (Goods and Services Tax Identification Number) is a unique 15-digit alphanumeric code assigned to every GST-registered business in India. The first 2 digits represent the state code, the next 10 are the PAN of the entity, the 13th digit indicates the number of registrations under the same PAN in that state, the 14th is always 'Z', and the 15th is a check digit. To obtain a GSTIN, you must register on the GST portal (gst.gov.in) with your PAN, Aadhaar, business address proof, and bank account details.

The Composition Scheme is a simplified GST option for small businesses with an annual turnover below ₹1.5 crore (₹75 lakhs for service providers). Instead of filing regular GST returns, registered businesses pay a fixed percentage of their turnover as tax - 1% for traders, 2% for manufacturers, and 5% for restaurants. The key trade-off is that composition dealers cannot claim Input Tax Credit and cannot collect GST from customers. They file a single quarterly return (CMP-08) instead of monthly GSTR-1 and GSTR-3B filings.

Under the normal GST system, the supplier collects and pays GST. Under the Reverse Charge Mechanism (RCM), this obligation is flipped - the recipient of goods or services is liable to pay the GST directly to the government. RCM applies when purchasing from an unregistered supplier, importing services from outside India, or in notified categories like legal services from advocates, freight services from a Goods Transport Agency, and director's remuneration. Businesses under RCM can claim ITC on the tax paid, subject to eligibility conditions.

A regular GST-registered taxpayer must file: GSTR-1 (outward supply details) - monthly if turnover exceeds ₹5 crore, or quarterly under QRMP scheme; GSTR-3B (summary return with tax payment) - monthly or quarterly; GSTR-9 (annual return) - once a year by 31 December of the following financial year; and GSTR-9C (reconciliation statement) for businesses with turnover above ₹5 crore. Missing or late filing attracts a late fee of ₹50 per day (₹20 for nil returns), subject to a maximum cap.

E-invoicing under GST refers to the system where B2B invoices are authenticated electronically by the Invoice Registration Portal (IRP) and assigned a unique Invoice Reference Number (IRN) along with a QR code. As of 2025, e-invoicing is mandatory for all GST-registered businesses with an annual aggregate turnover above ₹5 crore. The IRP validates the invoice data in real time and auto-populates it into GSTR-1 and the e-way bill system, significantly reducing manual data entry and reconciliation errors.