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🧾 GST Calculator

Calculate GST or VAT on any amount. Choose to add GST (exclusive amount) or remove GST (inclusive amount), select a tax rate and instantly see the base amount, tax and total.

Mode

Amount

Tax Rate (%)

What is this tool?

Goods and Services Tax (GST) is a comprehensive indirect tax levied on the supply of goods and services in many countries around the world. In India, GST was introduced on July 1, 2017, replacing a complex web of central and state taxes such as excise duty, service tax, VAT and cesses. The Indian GST system operates under four main rate slabs — 5%, 12%, 18% and 28% — with certain essential goods attracting a 0% rate or special rates. Other countries have similar consumption taxes: the United Kingdom charges a standard VAT of 20%, Australia imposes a 10% GST, and Singapore applies a 9% GST as of 2024. This GST calculator handles both common calculation modes: adding GST to a net (exclusive) amount and extracting GST from a gross (inclusive) amount. When the amount is tax-exclusive, the total is computed as amount x (1 + rate/100). When the amount is tax-inclusive, the GST component is isolated as amount x rate/(100 + rate), and the base amount equals the total minus the GST portion. The tool supports preset rates for India, the UK, Australia and Singapore, plus a custom rate option for any other jurisdiction. For business owners, accurate GST calculation is essential for invoicing, filing returns and claiming input tax credits. If you need to compute other types of tax, our income tax calculator and general tax calculator cover personal income tax. For transactional taxes in other regions, try the sales tax calculator or VAT calculator, and if you want to embed tax into your pricing strategy, the profit margin calculator helps you set the right margins.

How it works

The GST calculator accepts two inputs — the amount and the tax rate — along with a mode toggle between "Add GST" (for exclusive/net amounts) and "Remove GST" (for inclusive/gross amounts). In Add GST mode, the base amount is the entered value, the GST is computed as base x rate/100, and the total equals base + GST. In Remove GST mode, the entered value is the gross total, the base is calculated as total x 100/(100 + rate), and the GST portion is total minus base. The reference table below shows the standard GST and VAT rates for major countries: | Country | Tax Name | Standard Rate | Reduced Rates | |---|---|---|---| | India | GST | 18% | 0%, 5%, 12%, 28% | | United Kingdom | VAT | 20% | 5%, 0% | | Australia | GST | 10% | — | | Singapore | GST | 9% | — | | European Union | VAT | varies (19-27%) | varies by country | Always confirm the applicable rate with the local tax authority (such as cbic-gst.gov.in for India, hmrc.gov.uk for the UK, or ato.gov.au for Australia), as rates may change and specific goods or services may qualify for exemptions or reduced rates.

How to use

Enter the amount you want to calculate GST on.
Select the tax rate from the dropdown or enter a custom percentage.
Choose the mode — Add GST (exclusive amount) or Remove GST (inclusive amount).
Review your selections to ensure they match your invoice or quotation.
Click Calculate to see the base amount, GST amount and total amount.

Frequently Asked Questions

What is the difference between GST-inclusive and GST-exclusive amounts?

A GST-exclusive (net) amount does not include tax — GST is added on top to arrive at the total payable. A GST-inclusive (gross) amount already contains the tax — you need to extract the GST component to find the base amount. This calculator supports both modes: use "Add GST" for exclusive amounts and "Remove GST" for inclusive amounts.

What are the current GST rates in India?

Indian GST has four main rate slabs: 5%, 12%, 18% and 28%. Certain essential goods are taxed at 0% (nil rate), and some items like petroleum products and alcohol for human consumption are outside the GST framework. Gold and jewellery attract a special 3% rate. The most commonly applied rate for goods and services is 18%.

How do I remove GST from a GST-inclusive amount?

To extract GST from an inclusive amount, use the formula GST = Amount x Rate / (100 + Rate), and the base amount = Amount - GST. For example, if an invoice totals Rs. 11,800 at 18% GST, the GST component is 11,800 x 18/118 = Rs. 1,800 and the base is Rs. 10,000. This calculator performs the extraction automatically.

Which countries does this GST calculator support?

The calculator includes preset rates for India GST (0%, 5%, 12%, 18%, 28%), UK VAT (20%, 5%, 0%), Australia GST (10%) and Singapore GST (9%). You can also enter a custom percentage for any other country or jurisdiction. The calculation logic is the same regardless of country.

Can I use this calculator for VAT in European countries?

Yes. VAT (Value Added Tax) works on the same principle as GST. Simply enter the country-specific VAT rate (for example, 19% for Germany, 20% for France) using the custom rate field, and the calculator will compute the tax, base and total correctly.

Is GST the same as sales tax?

No. GST is a multi-stage value-added tax collected at every stage of the supply chain, with credits for tax already paid (input tax credit). Sales tax is typically a single-stage tax collected only at the final retail point. GST is more comprehensive and avoids the cascading tax effect of traditional sales tax. Use our sales tax calculator for single-stage US-style sales tax.

How accurate is this GST calculator?

This calculator applies the standard GST formulas (addition: total = base x (1 + rate/100); extraction: GST = amount x rate/(100 + rate)) and is accurate for all standard rate-based GST and VAT calculations. However, special situations such as reverse charge, composition scheme, or exempt supplies may require different treatment. Always verify with the relevant tax authority.

Disclaimer: This GST calculator is provided for informational and educational purposes only and does not constitute tax or legal advice. Tax rates, rules and regulations vary by jurisdiction and change over time. Always verify the current rates and rules with official sources such as cbic-gst.gov.in, hmrc.gov.uk, or ato.gov.au before filing returns or issuing invoices.

This tool is for informational purposes only and does not constitute financial advice. Consult a qualified financial professional for advice specific to your situation.

Tips & Advice

When using this GST calculator for business invoicing, always confirm whether your quoted price is GST-inclusive or GST-exclusive to avoid miscalculations and customer disputes. In India, GST-registered businesses must charge GST on taxable supplies, file regular returns on the GST portal (gst.gov.in), and can claim input tax credit for GST paid on business purchases — keeping accurate records of every transaction is essential. Be aware that different goods and services attract different GST rates; for example, essential food items are often taxed at 0% or 5%, while luxury goods and sin products may attract the peak 28% rate plus cess. If you deal with international clients, remember that exports are typically zero-rated under GST, meaning you charge 0% GST but can still claim input tax credit. For small businesses in India, the Composition Scheme allows turnover-based flat-rate tax with simplified compliance, but restricts input tax credit claims. Always verify the current rates with official sources like cbic-gst.gov.in, hmrc.gov.uk, or ato.gov.au before finalising invoices, as governments periodically revise tax slabs. Use our profit margin calculator to ensure your pricing accounts for GST without eroding your margins.

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