GST / Sales Tax Calculator
Add or remove tax from any price
Tax figures are estimates for information only and are not tax advice. Rates, exemptions, and rules differ by jurisdiction — confirm with your tax authority or a tax professional.
100% Private & In-Browser
Processed locally using client-side JavaScript. Your files and data never touch any server.
Instant & Unlimited
No registration, no waiting queues, and no limits on file conversions or generations.
What is GST / Sales Tax Calculator?
The GST Calculator adds or removes Goods and Services Tax from any amount at the rate you choose, showing the net value, the tax component, and the gross total separately. It works for GST as well as VAT and general sales-tax arithmetic wherever a flat percentage applies.
How to use GST / Sales Tax Calculator
Enter the amount — either tax-exclusive (net) or tax-inclusive (gross).
Set the applicable GST/VAT rate, for example 5%, 10%, 18%, or 20%.
Choose whether you are adding tax to a net price or extracting it from a gross price.
Read the breakdown: net amount, tax component, and gross total.
- Both directions: add tax to net, or back it out of a gross figure
- Any rate — presets for common GST/VAT regimes or a custom percentage
- Clear net / tax / gross breakdown for invoices and expense records
- Instant and private — computed on your device, nothing stored
- Pricing products so the tax-inclusive sticker lands on a target figure.
- Extracting the tax portion from a receipt or invoice for bookkeeping.
- Cross-checking supplier quotes that quote net and gross inconsistently.
Frequently Asked Questions
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