GST Calculator – Add or Remove Goods & Services Tax

Calculate Goods and Services Tax (GST) additions or reverse calculations to extract net price and tax amounts with our free GST Calculator.

GST Calculator – Add or Remove Goods & Services Tax
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Net Amount (Exclusive of GST) —
Calculated GST Tax Amount —
Gross Amount (Inclusive of GST) —
⚠️ Illustrative only. Not financial advice. Please delete history timely, it may impact your browser performance.

History — GST Calculator – Add or Remove Goods & Services Tax

# Time Base Amount GST Rate % Mode Net Price GST Tax Gross Price Action

GST Calculation Formulas

1. Add GST (Exclusive to Inclusive)

\(\text{GST Tax} = \text{Net Price} \times \frac{\text{GST \%}}{100}\) \(\text{Gross Price} = \text{Net Price} + \text{GST Tax}\)

2. Remove GST (Inclusive to Exclusive)

\(\text{Net Price} = \frac{\text{Gross Price}}{1 + (\text{GST \%} \div 100)}\) \(\text{GST Tax} = \text{Gross Price} - \text{Net Price}\)

GST Scenario Table ($500 Base Amount @ 18% GST)

Mode Base Input Amount Net Price (Excl) GST Tax Amount (18%) Gross Total (Incl)
Add GST $500.00 (Net) $500.00 $90.00 $590.00
Remove GST $500.00 (Gross) $423.73 $76.27 $500.00

Frequently Asked Questions

How do you calculate GST?

To add GST: Net Amount × (GST Rate / 100). To remove GST: Gross Amount - (Gross Amount / (1 + GST Rate / 100)).