GST Calculator
Calculate GST-inclusive or GST-exclusive prices instantly for any goods and services tax rate.
For informational purposes only, not professional financial or tax advice.
GST Calculator
Goods and Services Tax
Total = Amount × (1 + GST%/100) Finance Note: Common GST rates: Australia 10%, India 5–28%, Canada 5%, New Zealand 15%.
GST rates vary by country and can change. This calculator is for educational reference — always verify with your local tax authority for current rates.
Financial Disclaimer:
This tool is for informational and educational purposes only. It is not a substitute for professional financial, tax, or legal advice. Always consult a qualified professional regarding your specific financial situation.
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How to Calculate
GST Amount = Price × (GST% ÷ 100); Total = Price + GST
Add GST: GST Amount = Net Price × (GST % ÷ 100); Gross Price = Net Price + GST Amount. Remove GST: Net Price = Gross Price ÷ (1 + GST % ÷ 100); GST Amount = Gross Price − Net Price.
* Example: $100 item, 10% GST → $10 GST, $110 total
Step-by-Step Manual Calculation Guide
Step 1: To add GST (e.g., 10%), multiply net price by 0.10 for GST amount or 1.10 for total price.
Step 2: To remove 10% GST from a total price, divide total price by 1.10.
Step 3: Subtract net price from total price to verify tax amount.
Real-World Industry Applications
Commercial B2B Invoicing
Adding 10% Australian GST to a $1,000 service invoice ($100 GST, $1,100 total payable).
Retail Accounting Reconciliation
Removing 18% Indian GST from a $590 total receipt ($500 net price, $90 GST component).
Freelance Tax Filing
Itemizing collected GST amounts for quarterly government BAS/tax filings.
GST Calculator Worked Examples
How it Works
The GST (Goods and Services Tax) Calculator adds or removes GST percentages from invoice subtotals, widely used in Australia, India, Canada, and New Zealand.
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Frequently Asked Questions
How do I add 10% GST to a price?
Multiply the pre-tax price by 1.10. For example, $100 × 1.10 = $110 total price including GST.
How do I remove 10% GST from a total gross price?
Divide total price by 1.10 (not multiply by 0.90). For a $110 total price, $110 ÷ 1.10 = $100 pre-tax price ($10 GST).
What countries use GST?
Countries including Australia (10%), New Zealand (15%), India (5%, 12%, 18%, 28%), Canada (5% GST + provincial PST/HST), and Singapore (9%) use GST systems.
What is Input Tax Credit (ITC) in GST?
Input Tax Credit allows registered businesses to deduct GST paid on wholesale purchases from GST collected on sales before remitting tax to government.
Is GST mathematically identical to sales tax calculation?
Adding GST to a price uses the exact same mathematical percentage formula as adding sales tax.