About the Sales Tax Calculator
Quickly add tax to a price or remove it from a tax-inclusive total. Choose a preset rate such as 10% Australian GST or 18% Sri Lankan VAT, or enter any rate.
How to use it
- Choose “Add tax” or “Remove tax”.
- Enter the price.
- Pick a preset or enter the tax rate.
Formula & method
Add: Total = Price × (1 + rate)
Remove: Price = Total ÷ (1 + rate)Frequently asked questions
How do I remove GST from a price?
Divide the GST-inclusive price by 1.1 for 10% GST. For example, $110 ÷ 1.1 = $100 before GST, so the GST is $10.
Results are estimates for general information only and are not financial, tax, legal or medical advice. Please confirm important decisions with a qualified professional.