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GST Calculator - Calculate Goods and Services Tax Online Free

Calculate GST for India (0%, 5%, 12%, 18%, 28%), Australia (10%), New Zealand (10%), and other countries. Add or extract GST instantly.

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GST Exclusive GST Inclusive

Amount

GST Rate

About This Tool

What Is a GST Calculator?

A GST (Goods and Services Tax) calculator is a tool that computes the amount of GST owed on a transaction and the total cost including or excluding tax. GST is an indirect tax collected at each stage of the supply chain on the value added to goods and services. It is used in many countries around the world, including India, Australia, New Zealand, Canada, Singapore, and the United Kingdom.

Unlike sales tax, which is collected only at the final point of sale to the consumer, GST is collected by each business in the supply chain. Businesses can offset the GST they paid on their purchases (input tax credit) against the GST they collect on their sales, ensuring that tax is ultimately borne by the end consumer.

How Does GST Calculation Work?

GST calculations follow straightforward formulas depending on whether you are adding or extracting the tax:

GST Exclusive (Add GST) — When the base amount does not include GST: GST = Amount × Rate; Total = Amount + GST.
GST Inclusive (Extract GST) — When the total already includes GST: GST = Total − (Total / (1 + Rate)); Base Amount = Total / (1 + Rate).

For example, if you have a $200 service and the GST rate is 18%, the GST Exclusive calculation gives $200 × 0.18 = $36 in GST and a total of $236. If someone gives you $236 and you need to extract the GST, the base is $236 / 1.18 = $200 and the GST is $36.

GST Rates Around the World

GST rates vary by country and, in some cases, by product category. Here are the standard rates in major GST jurisdictions:

India — Five slabs: 0%, 5%, 12%, 18%, and 28%, depending on the HSN/SAC classification of the goods or services.
Australia — 10% standard rate. Essential food, healthcare, and education are GST-free.
New Zealand — 15% standard rate. Applies to most goods and services with very few exemptions.
Canada — 5% federal GST, with Harmonized Sales Tax (HST) in some provinces combining federal and provincial rates (up to 15% in the Atlantic provinces).
Singapore — 9% Goods and Services Tax (as of 2024).

This calculator supports India\'s five slabs and the 10% standard rate for Australia and New Zealand.

How to Use This Calculator

Choose the calculation mode — Select GST Exclusive to add GST to a base amount, or GST Inclusive to extract GST from a tax-inclusive total.
Enter the amount — Type the base amount (for GST Exclusive) or the total including GST (for GST Inclusive) into the input field.
Select the GST rate — Choose the applicable rate from the dropdown. For India, select from 0%, 5%, 12%, 18%, or 28%. For Australia and New Zealand, select 10%.
View the results — The calculator displays the GST amount, the original base price, and the total including or excluding GST as appropriate.

India GST Slabs Explained

India\'s GST system classifies goods and services into five rate slabs, each targeting a different category of products:

0% (Nil Rate) — Essential items such as fresh fruits, vegetables, unbranded food grains, healthcare services, and educational services.
5% — Basic necessities like packaged food products, footwear under &rupee;1,000, and economy-class transport.
12% — Standard goods such as processed food, business-class air tickets, and certain medical devices.
18% — Most goods and services including computers, software, financial services, restaurants (non-AC), and professional services.
28% — Luxury and sin goods such as tobacco products, aerated drinks, automobiles, and high-end electronics. A Compensation Cess may apply on top of the 28% rate for certain items.

The applicable rate is determined by the HSN (Harmonized System of Nomenclature) code for goods or SAC (Services Accounting Code) for services.

Input Tax Credit

A key feature of GST is the Input Tax Credit (ITC) mechanism. Businesses registered for GST can claim credit for the GST they paid on business purchases (inputs) against the GST they collect on sales (outputs). This means GST is effectively only paid on the value added at each stage of the supply chain, preventing cascading taxation (tax on tax).

For example, if a manufacturer pays $50 GST on raw materials and collects $120 GST on the finished product, they remit only $70 ($120 − $50) to the government. The final consumer bears the full $120 GST.

GST vs. Sales Tax

While both GST and sales tax are consumption taxes, they differ in how they are collected and administered:

Collection point — Sales tax is collected only at the final point of sale. GST is collected at each stage of the supply chain.
Input credits — GST allows businesses to claim input tax credits. Sales tax systems generally do not.
Rates — Sales tax systems often have a single rate per jurisdiction. GST systems may have multiple rate slabs.
Scope — Sales tax typically applies only to goods. GST generally covers both goods and services.

If you are calculating U.S. sales tax, see our Sales Tax Calculator instead.

Use Cases

Invoice Preparation

Businesses need to calculate the correct GST amount for every invoice. This calculator ensures that the GST component is accurate, whether you are adding GST to a base price or working backward from a GST-inclusive total.

Business Accounting

Separating GST from totals is essential for accurate bookkeeping. When recording revenue, expenses, or cash flow, keeping the GST component separate ensures your financial statements reflect the correct figures.

Cross-Border Trade

GST implications differ for domestic and international transactions. Exports are typically zero-rated, while imports may attract GST at the border. Understanding these rules helps businesses price their products correctly for international markets.

GST Filing

When preparing GST returns, you need to reconcile the GST you collected on sales with the GST you paid on purchases. This calculator helps verify the amounts you report against your actual transaction data.

Consumer Awareness

Understanding the GST component of your purchases helps you verify that the correct amount has been charged and makes you a more informed consumer.

Sales Tax Calculator — Calculate U.S. state and local sales tax for all 50 states and D.C.
Discount Calculator — Calculate the final price after applying percentage or dollar-amount discounts.
Margin Calculator — Calculate profit margin, markup, cost, and selling price for your products.

Privacy

All calculations are performed entirely in your browser. No amounts, rates, or results are sent to our servers. We do not store, log, or share any information you enter. The tool works offline once the page has loaded.

GST rates and rules vary by country and may change over time. This tool is for informational and educational purposes only. Always verify the applicable rate and rules with the relevant tax authority before making financial decisions. This tool does not constitute tax advice.

AI Overview

A GST calculator is a tool that computes the Goods and Services Tax amount on transactions. GST is an indirect tax collected at each stage of the supply chain on the value added to goods and services. The calculator supports two modes: GST Exclusive, where you add GST to a base amount (GST = Amount × Rate), and GST Inclusive, where you extract GST from a total that already includes tax (GST = Total − (Total / (1 + Rate))). It supports India's five GST slabs (0%, 5%, 12%, 18%, 28%) and the standard 10% rate used in Australia and New Zealand.

Quick Answers

How do I calculate GST?

To add GST, multiply the base amount by the GST rate. For example, $100 at 18% GST = $100 × 0.18 = $18 GST, total = $118. To extract GST from a total, divide the total by (1 + rate) and subtract from the total.

What is the GST rate in India?

India has five GST slabs: 0% for essential items (fresh food, healthcare), 5% for basic goods, 12% for standard goods, 18% for most goods and services, and 28% for luxury and sin goods. The applicable rate depends on the HSN/SAC code of the product or service.

What is the GST rate in Australia?

The standard GST rate in Australia is 10%. It applies to most goods and services. Some items like basic food, healthcare, and education are GST-free. Businesses with annual turnover below AUD 75,000 are not required to register for GST.

Is GST the same as VAT?

GST and VAT are both indirect taxes collected at each stage of the supply chain, but they differ in implementation. GST is generally simpler with fewer rates, while VAT systems often have more complex input credit mechanisms. Many countries have transitioned from VAT to GST for administrative simplicity.

How to Use the GST Calculator - Calculate Goods and Services Tax Online Free

Select whether you want to calculate GST Exclusive (add GST to an amount) or GST Inclusive (extract GST from a total that already includes tax).
Type the amount into the input field. For GST Exclusive, enter the pre-tax amount. For GST Inclusive, enter the total amount that already includes GST.
Choose the applicable GST rate from the dropdown. For India, rates include 0%, 5%, 12%, 18%, and 28%. For Australia and New Zealand, the standard rate is 10%.
Click Calculate to see the GST amount, the original price (before or after tax), and the total. Results are displayed instantly.

Benefits

Multiple GST Slabs
GST Exclusive and Inclusive
Instant Results
Free and Private
Works on Any Device
Educational and Practical

Common Mistakes

Confusing GST Inclusive and GST Exclusive modes — using the wrong mode produces a different result, so make sure you select the correct calculation type
Assuming all countries use the same GST rate — rates vary widely, from 5% in some countries to 27% in Hungary
Forgetting that some goods are zero-rated or exempt from GST — the calculator applies the selected rate regardless of product classification
Using the wrong GST slab for Indian goods — different product categories fall under different slabs (0%, 5%, 12%, 18%, 28%), so verify the correct rate for your specific item
Assuming GST and VAT are the same thing — while they function similarly as indirect taxes, the rules, registration thresholds, and input credit mechanisms differ between jurisdictions

Professional Tips

For Indian GST filing, always use the exact rate assigned to your HSN/SAC code rather than estimating the slab
When preparing invoices for Australian GST, remember that businesses with an annual turnover below AUD 75,000 are not required to register for GST
For cross-border transactions, GST may not apply to exports (zero-rated) but may apply to imports — check the specific rules for your jurisdiction
Keep pre-tax and GST amounts separate in your accounting records for accurate input tax credit claims
When in doubt about which GST rate applies, consult the official tax authority website for your country rather than relying on general guides

Common Use Cases

Invoice Preparation

Calculate the correct GST amount to add to invoices for goods and services, ensuring compliance with tax regulations in your jurisdiction.

Business Accounting

Separate GST from totals in financial records for accurate bookkeeping, profit-and-loss calculations, and input tax credit claims.

Cross-Border Trade

Calculate GST implications for international transactions, exports, and imports when dealing with GST-registered countries.

GST Filing

Verify the GST amounts on your returns by calculating the expected tax from your reported sales or purchase figures.

Education

Students and educators can use the tool to understand how GST calculations work across different countries and rate structures.

Consumer Awareness

Understand the GST component of your purchases and verify that the correct amount has been charged at the point of sale.

Related Concepts

GST (Goods and Services Tax)

A broad-based indirect tax levied on the supply of goods and services at each stage of the supply chain. GST is collected by businesses on behalf of the government and is a key revenue source in countries like India, Australia, New Zealand, and Canada.

VAT (Value-Added Tax)

An indirect tax similar to GST, collected at each stage of production and distribution. VAT is used in most European countries, while GST is more common in Asia-Pacific and parts of Africa.

Input Tax Credit

A mechanism that allows businesses to deduct the GST they paid on inputs (purchases) from the GST they collect on outputs (sales). This prevents double taxation and ensures tax is only paid on the value added at each stage.

GST Slabs

In India, goods and services are classified into different GST rate slabs: 0% (essential items), 5% (basic goods), 12% (standard goods), 18% (most goods and services), and 28% (luxury and sin goods).

GSTIN

Goods and Services Tax Identification Number, a 15-digit unique identifier assigned to every business registered under GST in India. It is required for filing returns and claiming input tax credits.

ABN (Australian Business Number)

An 11-digit identifier required for businesses registered for GST in Australia. Businesses with an annual turnover of AUD 75,000 or more must register for GST and hold an ABN.

Frequently Asked Questions

Multiply the pre-tax amount by the applicable GST rate. For example, if the base amount is $500 and the GST rate is 18%, the GST is $500 × 0.18 = $90, and the total invoice amount is $590.

If a total of $590 includes 18% GST, the base amount is $590 / 1.18 = $500, and the GST is $590 − $500 = $90. Use the "GST Inclusive" mode on this calculator for an instant result.

India classifies goods and services into five GST slabs: 0% for essential items like fresh food and healthcare, 5% for basic necessities, 12% for standard goods, 18% for most goods and services, and 28% for luxury and sin goods like tobacco and cars.

The standard GST rate in Australia is 10%. It applies to most goods and services sold domestically. Exports are generally GST-free. Some essential items like basic food, medical services, and education are also GST-free.

GST and VAT are both indirect taxes on consumption, but they differ in structure. GST typically has fewer rates and simpler input credit rules, while VAT systems can be more complex. Both are collected at each stage of the supply chain.

In most countries, businesses must register for and charge GST once their annual turnover exceeds a threshold (e.g., AUD 75,000 in Australia, INR 40 lakh in India for goods). Check the specific threshold and rules for your country.

Input Tax Credit (ITC) allows businesses to subtract the GST they paid on business purchases from the GST they collect on sales. This ensures that GST is only paid on the value added at each stage and prevents cascading taxation.

In most GST systems, exports are zero-rated, meaning the GST rate is effectively 0% on exported goods and services. This makes exports internationally competitive while still allowing exporters to claim input tax credits on their purchases.