GST Calculator
Add or remove GST from an amount and see the tax component instantly.
GST Calculator
Add or remove GST from an amount and see the tax component instantly.
About this gst calculator
The GST calculator works out the 10% goods and services tax on any amount, in both directions. Enter a GST-exclusive figure to add tax and see the gross total, or enter a GST-inclusive total to strip the tax back out and reveal the net price alongside the exact GST component.
It is handy whenever a price and its tax need to be reconciled: writing a quote, checking a supplier invoice, reconstructing the tax on a receipt, or confirming what a marketplace listing actually nets. The default rate matches Australia's 10% GST, and every result shows the net amount, the GST portion, and the gross total together.
Common uses
- Add 10% Australian GST to a net price before preparing a quote or invoice.
- Remove GST from a tax-inclusive total to see the original price and GST component.
- Check receipts, supplier prices, marketplace listings, and shopping totals before recording them.
Helpful tips
- Use the GST-inclusive mode when the total already includes tax
- Use the GST-exclusive mode when you need to add 10% GST to a base amount
- Confirm local tax rules with an accountant for formal reporting or cross-border sales
How to use GST Calculator
- Enter the amounts, dates, rates, or assumptions needed for GST Calculator.
- Check units, currency, tax rate, interest rate, date range, and rounding assumptions before calculating.
- Run the calculator and compare the result against your source values or a second scenario when planning matters.
- Adjust one input at a time to understand how the estimate changes.
- Use the result as a practical estimate, then confirm important financial, tax, health, or legal decisions with a qualified source.
Frequently asked questions
How do I calculate GST in Australia?
Australian GST is generally 10%. To add GST, multiply the net price by 1.10. To remove GST from a GST-inclusive total, divide the total by 1.10 and compare the result with the total.
Can I remove GST from a total price?
Yes. Enter the GST-inclusive amount and choose the remove GST option to see the net price and GST component.
Is GST Calculator free, and does it work on mobile?
Yes. GST Calculator is free to use on JustBloc with no account or installation, and the page is designed to work on desktop, tablet, and mobile browsers.