Free GST & VAT Calculator Online
Add or remove GST/VAT from any amount — supports any tax rate, instant calculation.
Enter values
Results
Tax Amount (GST)
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Pre-Tax Amount
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Total (incl. tax)
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Enter values to see the formula
How it works
Choose add or remove tax
Select whether you want to add tax to an amount or extract tax from a tax-inclusive amount.
Select a tax rate
Pick a common rate (5%, 10%, 15%, 18%, 20%) or enter a custom rate.
Enter the amount
Type the amount you want to calculate tax on.
Read the results
See the tax amount, pre-tax amount, and total instantly.
Common use cases
Invoicing
Add GST/VAT to your prices before creating an invoice to ensure you charge the right amount.
Expense reporting
Extract the tax component from a tax-inclusive receipt amount for accounting purposes.
Price comparison
Compare prices inclusive and exclusive of tax to understand true costs.
International trade
Calculate VAT for transactions in different countries using custom tax rates.
Frequently asked questions
What is GST?
GST (Goods and Services Tax) is a consumption tax applied in countries like India, Australia, Canada, and Singapore. The rate varies by country and product type.
What is VAT?
VAT (Value Added Tax) is a similar consumption tax used in the EU and many other countries. It is typically applied at each stage of the supply chain.
How do I remove tax from an inclusive amount?
Use "Remove Tax" mode. The formula is: Pre-tax amount = Inclusive amount ÷ (1 + rate/100). Tax = Inclusive amount − Pre-tax amount.
What rates are pre-set?
5%, 10%, 15%, 18%, and 20% — the most common GST/VAT rates globally. You can also enter any custom rate.
Is my data uploaded?
No. All calculations happen in your browser with no server calls.
Can I change the tax name?
Yes — you can relabel it as GST, VAT, HST, SST, or any other name.