Growfiy
GST Calculator
Summary
GST Breakdown
Formula
GST = (Amount × GST Rate) ÷ 100
Free Online GST Calculator for India
This GST calculator helps freelancers, small business owners, shopkeepers, and e-commerce sellers work out GST amounts in seconds — no spreadsheet or accountant call needed. Enter any amount, pick a GST slab (5%, 12%, 18%, or 28%), and choose whether GST needs to be added on top of your price (exclusive) or is already built into it (inclusive). The tool instantly shows the base amount, the GST amount, and the final total, so you can quote prices, prepare invoices, or check a bill correctly.
How GST Calculation Works
GST (Goods and Services Tax) is India's single indirect tax applied to the sale of most goods and services. Instead of multiple state and central taxes, GST combines them into one rate, split into slabs of 5%, 12%, 18%, and 28% depending on the category of goods or service.
Exclusive GST (GST added separately)
Used when your listed price doesn't include tax yet. GST is calculated on top of it.
GST Amount = (Amount × GST Rate) ÷ 100
Total = Amount + GST Amount
Example: ₹1,000 at 18% exclusive → GST = ₹180, Total = ₹1,180
Inclusive GST (GST already included)
Used when your listed price already has GST built in, and you want to know how much of it is tax.
Base Amount = Amount ÷ (1 + GST Rate ÷ 100)
GST Amount = Amount − Base Amount
Example: ₹1,180 at 18% inclusive → Base = ₹1,000, GST = ₹180
How to Use This GST Calculator
- 1. Enter the amount you want to calculate GST on.
- 2. Select the applicable GST rate — 5%, 12%, 18%, or 28%.
- 3. Choose Exclusive if GST needs to be added to your price, or Inclusive if GST is already part of the amount entered.
- 4. Read the base amount, GST amount, and total instantly in the summary panel — no need to press calculate.
Frequently Asked Questions
What are the different GST rates in India?
Goods and services in India are taxed at four main GST slabs — 5%, 12%, 18%, and 28% — depending on the category. Essential items are usually taxed lower, while luxury and sin goods fall in the 28% slab.
What is the difference between inclusive and exclusive GST?
Exclusive GST means the tax is added on top of your base price. Inclusive GST means the price you already have includes the tax, and the calculator works backward to show how much of it was GST.
How is GST calculated on an invoice?
Multiply the taxable value of the goods or service by the applicable GST rate and divide by 100. Add this GST amount to the base value to get the final invoice total.
Is this GST calculator accurate for filing returns?
This tool is meant for quick estimates on invoices, pricing, and everyday calculations. For GST return filing or compliance purposes, always verify figures with a qualified accountant or the official GST portal.
Does this tool store or upload my data?
No. All calculations run directly in your browser — your amounts are never sent to or stored on a server.