Calculators
GST Calculator
Add or extract GST from an amount at any tax rate — exclusive and inclusive modes supported.
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- Accessibility Tested
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- Responsive
Version 1.0.0 · Last reviewed
Tool
Result
Live output from your inputs
Enter values and calculate to see results.
How it worksShow guideHide guide
Introduction
Calculate GST (or similar sales tax) either by adding tax to a net price or by extracting tax from an inclusive price.
Disclaimer: This tool is for informational purposes only and is not professional medical, financial, or tax advice.
Formula
When the amount excludes GST, tax is a percentage of the base. When the amount includes GST, tax is extracted using rate ÷ (100 + rate).
- A — Entered amount
- r — GST rate (%)
- GST — Tax component
Step-by-step
- Enter the amount.
- Enter the GST rate as a percent.
- Choose exclusive (amount before tax) or inclusive (amount already taxed).
- Review GST, net, and gross figures.
Worked example
On a $1,000 exclusive amount at 18% GST, tax is $180 and the gross total is $1,180.
Use cases
- Add GST to a quoted ex-tax price
- Find tax already included in a bill total
- Check invoices at common rates (5%, 12%, 18%, 28%)
Frequently asked questions
What does inclusive mean?
Inclusive means the amount you entered already includes GST. The calculator backs out the tax portion.
Is this only for India GST?
The math works for any percentage sales tax. Use the rate that applies to your jurisdiction.
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