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How to Calculate GST in India?

The Goods and Services Tax (GST) is an indirect tax used in India. Depending on whether you want to calculate the price including tax or excluding tax, the formula changes slightly.

1. Adding GST (Exclusive)

Use this when you have the base price and need to add tax.

  • GST Amount = (Value × GST%) / 100
  • Net Price = Value + GST Amount
2. Removing GST (Inclusive)

Use this when the price already includes tax, and you want to find the original value.

  • GST Amount = Value - [Value x {100 / (100 + GST%)}]
  • Net Price = Value - GST Amount

Use this tool developed by WPFixHub to quickly calculate taxes for invoices, product pricing, or personal finance tracking.

What is GST Calculator?

GST (Goods and Services Tax) Calculator is a free online tool that helps you calculate GST on products and services in India. Launched on July 1, 2017, GST replaced multiple indirect taxes and unified India's tax structure. This calculator instantly shows you the GST amount, net price, and total price including tax.

Whether you're a business owner creating invoices, a shopkeeper pricing products, or a consumer wanting to understand bills, this calculator makes GST calculations effortless and accurate.

How to Calculate GST?

To Add GST (GST Exclusive):

GST Amount = (Original Cost × GST%) / 100

Total Price = Original Cost + GST Amount

To Remove GST (GST Inclusive):

Net Price = Total Price / (1 + GST%/100)

GST Amount = Total Price - Net Price

Example: For ₹1,000 product at 18% GST → GST = ₹180, Total = ₹1,180

GST Rates in India (2026)

GST Rate Applicable On
0% Essential items: milk, bread, fresh vegetables, education services, healthcare
5% Household necessities: sugar, spices, tea, coffee, edible oils, coal
12% Processed food, mobile phones, computers, business services
18% Most common: FMCG products, IT services, restaurants (non-AC), capital goods
28% Luxury items: AC vehicles, dishwashers, luxury hotels, cigarettes, aerated drinks

Frequently Asked Questions (FAQs)

GST stands for Goods and Services Tax. It's an indirect tax levied on the supply of goods and services in India. GST replaced multiple cascading taxes like VAT, service tax, excise duty, and created a unified tax structure.

Businesses with annual turnover exceeding ₹40 lakhs (₹20 lakhs for special category states) must register for GST. E-commerce sellers and suppliers of online information & database access services must register regardless of turnover.

CGST: Central GST collected by Central Government (for intra-state transactions)
SGST: State GST collected by State Government (for intra-state transactions)
IGST: Integrated GST collected by Central Government (for inter-state transactions)
For 18% GST within state: 9% CGST + 9% SGST. Between states: 18% IGST.

Yes, registered businesses can claim Input Tax Credit (ITC) for GST paid on purchases used for business purposes. ITC reduces your output GST liability. However, ITC cannot be claimed on blocked items like motor vehicles (except for specific business use), food & beverages, and personal goods.

GSTR-1: 11th of next month (outward supplies)
GSTR-3B: 20th of next month (summary return with tax payment)
GSTR-9: Annual return by 31st December
Late filing attracts penalties and interest charges.

Reverse Charge Mechanism (RCM) means the recipient of goods/services pays GST instead of the supplier. This applies when: (1) Unregistered supplier supplies to registered person, (2) Import of services, (3) Specific notified goods/services like legal services, GTA services, etc.

Benefits of GST in India

One Nation, One Tax: Unified tax structure across India
Reduced Tax Burden: Eliminated cascading effect of taxes
Easy Compliance: Online registration and return filing
Boosted GDP: Improved ease of doing business in India

Important for Businesses

  • Keep proper GST invoices for input tax credit claims
  • File returns on time to avoid penalties (₹100/day, max ₹5,000)
  • Ensure your GSTIN is active and not suspended
  • Reconcile GSTR-2A with purchase records monthly