GST (Goods and Services Tax) is a comprehensive indirect tax levied on the supply of goods and services. It is a destination-based tax collected at the point of consumption. India uses a multi-slab GST structure (5%, 12%, 18%, 28%); Australia uses a flat 10% GST.

How do I calculate GST on a price?

To add GST: Total = Net x (1 + Rate/100). GST Amount = Total - Net. Example: Net Rs 1000 at 18% GST: Total = Rs 1180. GST = Rs 180. To remove GST: Net = Total / (1 + Rate/100). GST = Total - Net.

What are the GST rates in India?

India has four main GST slabs: 5% for essential goods and services, 12% for standard goods, 18% for most professional services and manufactured goods, and 28% for luxury and demerit goods such as cars, tobacco, and aerated drinks.

GST Calculator — Add or Remove GST Instantly

This free GST calculator helps business owners, accountants, freelancers, and shoppers in India, Australia, and other GST countries calculate tax-inclusive and tax-exclusive prices in seconds. Select the applicable GST rate, enter your amount, and see the net price, GST amount, and total in real time — with no signup required.

Amount ($)

GST Rate (%)

Breakdown

Net Amount $0

GST Amount $0

Total Amount

How to Use the GST Calculator

Select mode: Add GST if your price is before tax (exclusive); Remove GST if your price already includes tax (inclusive).
Enter the amount in the input field.
Choose the GST rate from the dropdown — 5%, 10% (Australia), 12%, 18%, or 28%.
Read the breakdown: Net Amount, GST Amount, and Total updated instantly.

GST Formulas

Adding GST: Total = Net × (1 + Rate/100) | GST = Total − Net
Removing GST: Net = Total ÷ (1 + Rate/100) | GST = Total − Net

Example: ₹1,000 net at 18% GST → Total = ₹1,180. GST amount = ₹180.

Reverse: ₹1,180 inclusive at 18% → Net = ₹1,180 ÷ 1.18 = ₹1,000. GST = ₹180.

Key Features

Two modes: Add GST (exclusive → inclusive) and Remove GST (inclusive → exclusive).
Covers all Indian GST slabs: 5%, 12%, 18%, and 28%, plus Australian 10% GST.
Real-time results — updates on every keystroke with no Calculate button needed.
Clear three-way breakdown: Net Amount, GST Amount, and Total — the three figures needed for any invoice or receipt.
Works on any device — mobile, tablet, and desktop — with no installation or account required.

Use Cases

Calculate GST on an Invoice in India

Indian GST-registered businesses must show net, GST, and total on each invoice line item. Select the applicable slab — 5%, 12%, 18%, or 28% — enter the net price, and read off the exact GST amount and gross total for your invoice.

Reverse GST to Find Pre-Tax Price

When you have a receipt showing only the GST-inclusive total and need to isolate the original price (for input tax credit claims or expense reporting), switch to Remove GST mode and enter the gross amount.

Australian GST Calculation

Australia applies a flat 10% GST to most goods and services. Select the 10% rate to quickly add or remove GST for BAS (Business Activity Statement) preparation, quoting, or invoice generation.

Check GST on a Purchase Before Buying

Consumers can enter a listed price and the applicable GST rate to understand how much of the retail price is tax — useful for comparing net prices between GST-inclusive and GST-exclusive product listings.

Understanding GST: Complete Guide

What is GST?

Goods and Services Tax (GST) is a comprehensive, multi-stage, destination-based indirect tax levied on the value added at each stage of the supply chain. Unlike a simple sales tax (applied only at final sale), GST is collected at each production step — but businesses can claim back the GST they paid on inputs (input tax credit), so the final consumer ultimately bears the tax burden.

GST-Exclusive vs GST-Inclusive

GST Exclusive — the quoted price does not include tax. Add GST to find what the buyer actually pays. GST Inclusive — the price already contains GST. Divide by (1 + Rate/100) to find the net price; the difference is the GST component.

Indian GST Slabs

5%: Essential items — basic food, transport, essential medicines.
12%: Standard goods — processed food, mobile phones, computers.
18%: Most professional services, most manufactured goods, hotels.
28%: Luxury and demerit goods — automobiles, tobacco, aerated drinks.

CGST, SGST, and IGST

For intra-state (within a state) transactions in India, GST is split equally between Central GST (CGST) and State GST (SGST). For inter-state transactions, Integrated GST (IGST) is charged at the full combined rate. Example: 18% GST on an intra-state supply = 9% CGST + 9% SGST. On inter-state: 18% IGST.

FAQ's

GST (Goods and Services Tax) is a comprehensive indirect tax on the supply of goods and services, applied at each stage of the supply chain. It is destination-based — tax is collected where goods or services are consumed. India has a multi-slab structure (5%, 12%, 18%, 28%); Australia uses a flat 10% GST.

GST-exclusive means the price does not include tax — you must add GST to get the final payable amount. GST-inclusive means the price already contains GST; to find the original net price, divide by (1 + Rate/100). Select the correct mode in this calculator before entering your amount.

Adding 18% GST: Total = Net × 1.18. GST Amount = Total − Net. For ₹5,000 net: Total = ₹5,900. GST = ₹900. Removing 18% GST from an inclusive price: Net = Gross ÷ 1.18. For ₹5,900: Net = ₹5,000. GST = ₹900.

India's four principal GST slabs are: 5% for essential goods and basic services; 12% for standard goods like processed food and computers; 18% for most manufactured goods and professional services; and 28% for luxury items such as passenger vehicles, tobacco products, and aerated drinks. Certain items are exempt or zero-rated.

For intra-state (within one Indian state) transactions, GST is equally split between Central GST (CGST) and State GST (SGST). For inter-state transactions, Integrated GST (IGST) is charged at the full combined rate. Example: 18% GST on an intra-state supply = 9% CGST + 9% SGST on the invoice; for inter-state = 18% IGST.

Australia charges a flat 10% Goods and Services Tax on most goods and services. Some supplies are GST-free (fresh food, medical services, education) or input-taxed (financial services, residential rent). Select the 10% option to calculate Australian GST.

Yes, in both India and Australia, GST-registered businesses can claim back the GST they paid on business inputs (purchases used for business purposes), reducing their net GST liability. Only the end consumer ultimately bears the full tax cost. Consult your accountant or the relevant tax authority for precise eligibility rules.

They are economically similar — both are multi-stage consumption taxes with input tax credit mechanisms. The key difference is naming and implementation. The UK, EU, and most of Europe use "VAT"; India, Australia, Canada, Singapore, and New Zealand use "GST". The underlying add/remove formulas are identical.

Related Tools

GST is a daily compliance requirement for millions of businesses across India, Australia, Canada, Singapore, and New Zealand. Whether you are raising an invoice, reconciling accounts, preparing a BAS, or simply checking how much tax is included in a price, Toolaroid's free GST calculator gives you instant, accurate results. To express a GST amount as a percentage of the net price, or to verify the rate applied on a receipt, the percentage calculator is a handy companion. No account, no data collection — every calculation runs entirely in your browser.