Advanced GST Calculator
Calculate GST with multiple currencies
Calculation Results
Base Amount
$ 0.00
GST Amount
$ 0.00
Total Amount
$ 0.00
| Description | Amount |
|---|---|
| Base Amount | $ 0.00 |
| GST (18%) | $ 0.00 |
| Total Amount | $ 0.00 |
| Currency | USD |
Last calculated: 21 Aug 2025, 17:39
GST Calculator
Our Advanced GST Calculator helps businesses and individuals accurately calculate Goods and Services Tax (GST) for invoices, purchases, and financial planning. Whether you need standard GST calculation or reverse GST calculation (working backwards from a total amount), this tool provides instant results with detailed breakdowns.
Key Features
- Standard and reverse GST calculations
- Support for multiple currencies (USD, EUR, GBP, etc.)
- Preset tax rates for quick access
- Detailed results breakdown
- Export to CSV and print functionality
GST Basics
- GST is a value-added tax levied on most goods and services
- Standard calculation: Base Amount × (1 + GST Rate)
- Reverse calculation: Total Amount ÷ (1 + GST Rate)
- Common GST rates vary by country (5%, 12%, 18%, 28%)
Understanding GST Calculations
Standard GST Calculation
Standard GST calculation is used when you know the base amount and need to determine the total amount including GST.
Formula:
GST Amount = Base Amount × (GST Rate / 100)
Total Amount = Base Amount + GST Amount
Example:
For a $100 product with 18% GST:
GST = $100 × 0.18 = $18
Total = $100 + $18 = $118
Reverse GST Calculation
Reverse GST calculation is used when you know the total amount including GST and need to determine the base amount and GST component.
Formula:
Base Amount = Total Amount ÷ (1 + (GST Rate / 100))
GST Amount = Total Amount - Base Amount
Example:
For a $118 total with 18% GST:
Base Amount = $118 ÷ 1.18 = $100
GST = $118 - $100 = $18
GST Rates by Country
| Country | Standard Rate | Reduced Rates | Local Name |
|---|---|---|---|
| India | 5%, 12%, 18%, 28% | 0%, 0.25%, 3% | GST |
| Canada | 5% (Federal) | Varies by province | GST/HST |
| Australia | 10% | 0% on some essentials | GST |
| Singapore | 8% | 0% on exports | GST |
| New Zealand | 15% | 0% on some goods | GST |
Note: Rates are subject to change. Always verify current rates with local tax authorities.
Frequently Asked Questions
What is the difference between GST and sales tax?
GST (Goods and Services Tax) is a value-added tax levied at each stage of the supply chain, with credits available for taxes paid at previous stages. Sales tax is typically only applied at the final point of sale to the consumer. GST is generally considered more efficient as it avoids "tax on tax."
When should I use reverse GST calculation?
Reverse GST calculation is useful when you only know the total amount paid (including GST) and need to determine:
- The original price before GST was added
- The exact GST amount included in the total
- For expense tracking and accounting purposes
How do I handle GST for international transactions?
GST treatment for international transactions varies by country. Generally:
- Exports are often zero-rated (0% GST)
- Imports may be subject to GST at the border
- Digital services may have special rules
Can I use this calculator for VAT calculations?
Yes, this calculator works for Value Added Tax (VAT) calculations as well, since GST and VAT are similar types of consumption taxes. Just enter your local VAT rate instead of GST rate. The calculation principles are identical.