- Built for Business. Trusted by Travelers.
GST Mate is your powerful, easy-to-use global calculator for GST/VAT-inclusive and exclusive pricing—whether you're a business managing invoices, a freelancer quoting clients, or a traveler claiming back tax at airports across the globe.

- Who Is GST Mate For?
Small Business Owners & Freelancers
Easily calculate taxes on services, invoices, and quotes. Save time, reduce errors, and stay tax-ready with one tap.

- International Travelers
Instantly calculate how much VAT/GST is included in your purchases when shopping overseas—perfect for duty-free refunds in Europe, Australia, New Zealand, Japan, and beyond.

- Top Features
Real-Time GST/VAT Calculation
Type a value in any field—Excluding Tax, Tax Amount, or Including Tax—and GST Mate instantly calculates the other two. Designed to be fast and intuitive.

- Global Rates Built-In
Use preset tax rates from over 10 countries:

- Australia (10%)

- New Zealand (15%)

- UK (20%)

- Germany (19%)

- France (20%)

- Italy (22%)

- China (13%)

- Canada (5%)

- Japan (10%)
Or enter your own rate.

- Bi-Directional Input
Calculate from any angle—whether you know the net price, gross price, or just the tax component.

- Smart Expression Support
Add or subtract multiple items directly in any input field. Example: 150 + 200 - 50 → Automatically calculated before applying tax.

- Perfect for Quotes & Invoices
Accurately determine tax for services, products, and digital goods. Ideal for freelancers, consultants, and small business owners.

- Great for Claiming VAT Refunds
Traveling in Europe, Japan, or Australia? Know exactly how much tax is refundable before you fill out forms or use refund kiosks.

- Multilingual & Multi-Currency Support
Choose your preferred language and currency symbol. Supports:

- English

- Arabic

- Hindi

- French

- Spanish

- German

- Simplified Chinese
...more coming soon!

- Rounding Modes for Precision
Standard: 2 decimal places for real-world use

High Precision: 6+ decimals for accurate reverse calculations

- Copy & Share Values Easily
Tap to copy any value. Paste it into invoices, apps, or chat—no retyping needed.

- Privacy First. Always.
No sign-ups. No ads. No internet required. Your data never leaves your device.

- Example Use Cases
You’re a freelancer quoting a client:
Add your service total → GST Mate tells you the full price with tax.

You’re traveling in France:
Enter your purchase total → Know how much VAT you can refund before you leave.

You’re running a solo business:
Issue invoices with full tax clarity—and ensure every cent is accurate.

- Example Calculations
Enter $100 (Excl. GST @15%) → GST: $15, Total: $115

Enter €120 (Incl. VAT @20%) → VAT: €20, Net: €100

- Download GST Mate Today
Whether you're managing a business or refunding travel tax, GST Mate gives you full control, clarity, and confidence in your tax calculations—worldwide.