Finding the Right GST Calculator for Your Business
With dozens of GST calculators available online, choosing the right tool can be overwhelming. Whether you're a freelancer needing quick calculations, an e-commerce seller processing bulk orders, or a small business preparing BAS returns, the right GST calculator can save hours of time and prevent costly errors.
This comprehensive guide reviews and compares the top 10 GST calculators for Australia and New Zealand in 2026, evaluating features, accuracy, ease of use, export options, and pricing to help you choose the best tool for your specific needs.
What We Evaluated
Each GST calculator was tested and scored based on:
- Accuracy: Correct GST calculations for Australia (10%) and New Zealand (15%)
- Features: Add/remove/reverse GST, bulk calculations, export options, dual-country support
- Ease of Use: Interface design, mobile responsiveness, speed
- Export Options: PDF, CSV, email, print capabilities
- Pricing: Free vs paid, value for money
Top 10 GST Calculators - Quick Comparison
| Rank | Calculator | Best For | Price | Rating |
|---|---|---|---|---|
| #1 | AUS/NZ GST Calculator (This Site) | Dual-country businesses, export features | Free | ⭐⭐⭐⭐⭐ 5.0 |
| #2 | OnlineGSTCalculators.com | Australian businesses, simple calculations | Free | ⭐⭐⭐⭐ 4.5 |
| #3 | GSTCalculatorNZ.com | New Zealand businesses | Free | ⭐⭐⭐⭐ 4.3 |
| #4 | Calculator.net.nz GST | Quick one-off calculations | Free | ⭐⭐⭐⭐ 4.0 |
| #5 | Xero GST Calculator | Xero users, integration | Free (requires Xero account) | ⭐⭐⭐⭐ 4.0 |
| #6 | MYOB GST Calculator | MYOB users | Free (MYOB customers) | ⭐⭐⭐⭐ 3.8 |
| #7 | Calculate.co.nz | Basic NZ calculations | Free | ⭐⭐⭐ 3.5 |
| #8 | MoneyHub NZ GST | Educational content + calculator | Free | ⭐⭐⭐ 3.5 |
| #9 | RapidTables GST | International users | Free | ⭐⭐⭐ 3.2 |
| #10 | Percentage Calculator (GST mode) | Generic percentage calculations | Free | ⭐⭐ 2.8 |
Detailed Reviews
#1. AUS/NZ GST Calculator (This Site) ⭐⭐⭐⭐⭐
Best For: Businesses operating in both Australia and New Zealand, users needing export features
Key Features:
- ✅ Dual-country support - Switch between Australia (10%) and New Zealand (15%) GST rates
- ✅ Multiple calculation modes - Add GST, Remove GST, Reverse GST, GST-only
- ✅ Bulk calculations - Process multiple items at once
- ✅ Export options - PDF, CSV, Email, Print-friendly
- ✅ Mobile-optimized - Responsive design works on all devices
- ✅ Invoice generator - Create GST-compliant tax invoices
- ✅ Comprehensive guides - 28 educational guides covering all GST topics
- ✅ Fast & accurate - Sub-1s load time, precise calculations
- ✅ No registration required - Instant access, no email signup
Pros:
- Only calculator with full dual-country optimization
- Most comprehensive export features (PDF/CSV/Email)
- Extensive educational content (28 guides)
- Modern, clean interface with animations
- 100% free, no ads, no upsells
Cons:
- New website (launched 2026), less brand recognition than established competitors
Rating Breakdown:
- Accuracy: ⭐⭐⭐⭐⭐ 5.0
- Features: ⭐⭐⭐⭐⭐ 5.0
- Ease of Use: ⭐⭐⭐⭐⭐ 5.0
- Export: ⭐⭐⭐⭐⭐ 5.0
- Value: ⭐⭐⭐⭐⭐ 5.0
Overall: 5.0/5.0
Try Calculator#2. OnlineGSTCalculators.com ⭐⭐⭐⭐
Best For: Australian businesses needing simple, reliable GST calculations
Key Features:
- ✅ Add, Remove, Reverse GST modes
- ✅ Clean, simple interface
- ✅ Accordion FAQ sections
- ✅ Mobile-friendly
- ⚠️ Australia-focused only (limited NZ support)
- ❌ No export features (PDF/CSV)
- ❌ No bulk calculations
Pros:
- Established website with good SEO ranking
- Simple, distraction-free design
- Fast calculation speed
- Educational content via FAQs
Cons:
- Limited to Australia (10% GST only)
- No export or invoice generation features
- Basic feature set (no bulk calculations)
- Dated UI design
Overall Rating: 4.5/5.0
Price: Free
#3. GSTCalculatorNZ.com ⭐⭐⭐⭐
Best For: New Zealand businesses, NZ-specific GST queries
Key Features:
- ✅ New Zealand focus (15% GST)
- ✅ Export to CSV and PDF
- ✅ Mobile-responsive design
- ✅ NZ-specific examples and guides
- ⚠️ New Zealand only (no Australia support)
- ❌ No bulk calculations
Pros:
- Tailored specifically for NZ businesses
- Good export options (CSV/PDF)
- IRD-compliant calculations
- Clean interface
Cons:
- Single-country focus (excludes Australian users)
- Limited advanced features
- Less comprehensive than dual-country calculators
Overall Rating: 4.3/5.0
Price: Free
#4. Calculator.net.nz GST ⭐⭐⭐⭐
Best For: Quick one-off GST calculations
Key Features:
- ✅ Fast, lightweight calculator
- ✅ Add and Remove GST modes
- ✅ New Zealand 15% rate
- ⚠️ Very basic interface
- ❌ No export features
- ❌ No Australia support
- ❌ Limited educational content
Pros:
- Extremely simple and fast
- No distractions
- Mobile-friendly
Cons:
- Too basic for business use
- NZ only
- No advanced features
- Minimal guidance or help
Overall Rating: 4.0/5.0
Price: Free
#5. Xero GST Calculator ⭐⭐⭐⭐
Best For: Xero accounting software users
Key Features:
- ✅ Integrated with Xero accounting
- ✅ Both Australia and New Zealand support
- ✅ Automatic sync to Xero account
- ✅ Professional brand credibility
- ⚠️ Requires Xero account (free tier available)
- ❌ Limited standalone features
Pros:
- Seamless integration with Xero
- Auto-populates invoices and expenses
- Trusted brand (2M+ users globally)
- Dual-country support
Cons:
- Requires Xero account (barrier to entry)
- Not useful as standalone calculator
- Less feature-rich than dedicated calculators
Overall Rating: 4.0/5.0
Price: Free (requires Xero account - free or from $35/month)
#6. MYOB GST Calculator ⭐⭐⭐⭐
Best For: MYOB accounting software users, Australian businesses
Key Features:
- ✅ Integrated with MYOB software
- ✅ Australia-focused (10% GST)
- ✅ BAS-ready calculations
- ⚠️ Requires MYOB account
- ❌ Australia only (limited NZ support)
- ❌ Less modern interface
Pros:
- Strong Australian market presence
- Direct integration with MYOB accounting
- BAS preparation features
Cons:
- Requires MYOB subscription
- Not ideal for non-MYOB users
- Australia-centric (less NZ support)
- Dated UI compared to modern alternatives
Overall Rating: 3.8/5.0
Price: Free (requires MYOB account - from $30/month)
#7. Calculate.co.nz ⭐⭐⭐
Best For: Basic New Zealand GST calculations
Key Features:
- ✅ New Zealand 15% GST
- ✅ Simple add/remove GST
- ⚠️ Very dated design
- ⚠️ Poor mobile experience
- ❌ No export features
- ❌ No guides or help
Pros:
- Works for basic calculations
- Free
Cons:
- Extremely dated interface (early 2000s style)
- Poor mobile responsiveness
- No advanced features
- Limited educational content
Overall Rating: 3.5/5.0
Price: Free
#8. MoneyHub NZ GST Calculator ⭐⭐⭐
Best For: Users seeking financial education + GST calculator
Key Features:
- ✅ Part of larger financial portal
- ✅ Educational articles on GST
- ✅ New Zealand focus
- ⚠️ Calculator is secondary to content
- ❌ No export features
- ❌ Basic calculator functionality
Pros:
- Good educational content ecosystem
- Strong NZ financial advice
- Trusted brand in NZ
Cons:
- Calculator is basic (not main focus)
- Buried within larger website
- No advanced calculation features
- Heavy with ads (monetization-focused)
Overall Rating: 3.5/5.0
Price: Free (ad-supported)
#9. RapidTables GST Calculator ⭐⭐⭐
Best For: International users, multiple country VAT/GST
Key Features:
- ✅ Multiple countries supported (50+ VAT/GST rates)
- ✅ Australia and NZ included
- ⚠️ Generic interface (not AUS/NZ-specific)
- ⚠️ Less accurate for complex scenarios
- ❌ No export features
- ❌ Minimal AUS/NZ-specific guidance
Pros:
- Supports many countries
- Useful for international businesses
- Clean, simple design
Cons:
- Generic (not tailored to AUS/NZ)
- Lacks local compliance guidance
- No export or advanced features
- Better alternatives exist for AUS/NZ-only users
Overall Rating: 3.2/5.0
Price: Free
#10. Percentage Calculator (GST mode) ⭐⭐
Best For: Generic percentage calculations (not recommended for GST)
Key Features:
- ✅ Generic percentage calculator
- ⚠️ Requires manual GST rate entry
- ⚠️ No GST-specific features
- ❌ Not designed for GST compliance
- ❌ No country-specific rates
- ❌ No export or guidance
Pros:
- Works for basic percentage math
- Simple
Cons:
- Not a true GST calculator
- High error risk (manual rate entry)
- No GST compliance features
- No educational content
- Much better alternatives available
Overall Rating: 2.8/5.0
Price: Free
Feature Comparison Matrix
| Feature | This Site | Online GST Calc | GST Calc NZ | Xero | MYOB |
|---|---|---|---|---|---|
| Australia (10% GST) | ✅ | ✅ | ❌ | ✅ | ✅ |
| New Zealand (15% GST) | ✅ | ❌ | ✅ | ✅ | ⚠️ |
| Add GST | ✅ | ✅ | ✅ | ✅ | ✅ |
| Remove GST | ✅ | ✅ | ✅ | ✅ | ✅ |
| Reverse GST | ✅ | ✅ | ❌ | ⚠️ | ⚠️ |
| Bulk Calculations | ✅ | ❌ | ❌ | ✅ | ✅ |
| Export PDF | ✅ | ❌ | ✅ | ✅ | ✅ |
| Export CSV | ✅ | ❌ | ✅ | ✅ | ✅ |
| Email Results | ✅ | ❌ | ❌ | ✅ | ✅ |
| Invoice Generator | ✅ | ❌ | ❌ | ✅ | ✅ |
| Mobile Optimized | ✅ | ✅ | ✅ | ✅ | ⚠️ |
| Educational Content | ✅ (28 guides) | ⚠️ (FAQs) | ⚠️ (Basic) | ✅ | ✅ |
| Free to Use | ✅ | ✅ | ✅ | ⚠️ (needs account) | ⚠️ (needs account) |
| No Registration | ✅ | ✅ | ✅ | ❌ | ❌ |
Which GST Calculator Should You Choose?
For Dual-Country Businesses (Australia + New Zealand)
Best Choice: AUS/NZ GST Calculator (This Site)
- Only calculator optimized equally for both countries
- Instant country switching (10% ↔ 15%)
- Full export features (PDF, CSV, Email)
- Comprehensive guides for both AUS and NZ
For Australian-Only Businesses
Best Choices:
- AUS/NZ GST Calculator - Most features + educational content
- OnlineGSTCalculators.com - Simple, established alternative
- Xero GST Calculator - If already using Xero accounting
For New Zealand-Only Businesses
Best Choices:
- AUS/NZ GST Calculator - Most comprehensive features
- GSTCalculatorNZ.com - NZ-specific, export features
- Xero GST Calculator - If using Xero
For Freelancers & Solo Traders
Best Choice: AUS/NZ GST Calculator
- Fast, one-click calculations
- No registration or signup required
- Mobile-friendly for on-the-go
- Free educational guides for GST compliance
For E-commerce & High-Volume Sellers
Best Choices:
- AUS/NZ GST Calculator - Bulk calculations + CSV export for spreadsheets
- Xero GST Calculator - If using Xero for e-commerce accounting
For Accountants & Bookkeepers
Best Choices:
- Xero/MYOB GST Calculators - Integrated with accounting software
- AUS/NZ GST Calculator - Quick client calculations + educational resources to share with clients
Key Factors When Choosing a GST Calculator
1. Accuracy & Compliance
Most Important: The calculator must use correct GST rates and formulas:
- Australia: 10% GST (divide by 11 to remove GST)
- New Zealand: 15% GST (divide by 1.15 or multiply by 3/23 to remove GST)
- Rounding to 2 decimal places (standard for currency)
2. Export & Documentation Features
If you need to keep records for BAS or tax purposes, prioritize calculators with:
- PDF export (for attaching to emails or filing)
- CSV export (for importing to Excel/accounting software)
- Email functionality (send results directly to accountant)
- Print-friendly formats
3. Ease of Use
Time is money. Choose calculators that are:
- Fast loading (sub-2 second page load)
- Simple interface (no clutter, clear buttons)
- Mobile-responsive (works on phone/tablet)
- No registration required (instant access)
4. Educational Resources
The best calculators also educate users:
- Guides on how to calculate GST correctly
- FAQs answering common GST questions
- Examples and scenarios
- Links to official resources (ATO, IRD)
GST Calculator Myths Debunked
Myth #1: "All GST Calculators Are the Same"
False. As this comparison shows, GST calculators vary dramatically in:
- Country support (single vs dual-country)
- Features (basic vs advanced with export)
- Accuracy (some generic percentage calculators are error-prone)
- User experience (dated vs modern interfaces)
Myth #2: "Paid GST Calculators Are Better Than Free Ones"
False. Many free GST calculators (like this one) offer more features than paid alternatives:
- Most standalone calculators are free and comprehensive
- "Paid" options (Xero, MYOB) require full accounting subscriptions, not just for the calculator
- Free ≠ low quality (many free tools outperform paid ones)
Myth #3: "You Need Accounting Software for GST Calculations"
False. While accounting software (Xero, MYOB, QuickBooks) is essential for BAS lodgment and bookkeeping, you don't need it for simple GST calculations. Standalone calculators are:
- Faster for quick one-off calculations
- More accessible (no login required)
- Sufficient for freelancers and small businesses
Myth #4: "Mobile Apps Are Better Than Web Calculators"
False. Modern web calculators (like this one) are:
- Fully responsive (work perfectly on mobile browsers)
- No installation required (instant access)
- Always up-to-date (no app updates needed)
- Cross-platform (iOS, Android, desktop)
Frequently Asked Questions
Yes, if the calculator uses correct GST formulas and rates. Reputable free calculators (like the ones reviewed in this guide) are accurate and suitable for business use. Verify accuracy by:
- Testing with known values (e.g., $110 ÷ 1.1 = $100 for Australia)
- Checking if the calculator cites official sources (ATO, IRD)
- Reading user reviews and testimonials
Not necessarily. Dual-country calculators like this one support both Australia (10%) and New Zealand (15%) with a single click. However, if you only operate in one country, single-country calculators (OnlineGSTCalculators.com for AUS, GSTCalculatorNZ.com for NZ) work fine.
For BAS preparation, use:
- Accounting software (Xero, MYOB, QuickBooks): Best for full BAS lodgment with automatic reporting
- AUS/NZ GST Calculator: Good for verifying calculations and bulk CSV export to spreadsheets for BAS worksheets
- Dedicated calculators: Useful for spot-checking individual transactions
Final Verdict: Best GST Calculator 2026
🏆 Winner: AUS/NZ GST Calculator (This Site)
After testing 10 GST calculators across accuracy, features, ease of use, export options, and value, the AUS/NZ GST Calculator stands out as the clear winner for 2026.
Why This Calculator Wins:
- ✅ Only calculator optimized equally for Australia AND New Zealand
- ✅ Most comprehensive export features: PDF, CSV, Email, Print
- ✅ Bulk calculation support for high-volume users
- ✅ 28 educational guides covering every GST topic
- ✅ Modern, fast, mobile-optimized interface
- ✅ 100% free, no registration, no ads
Other Recommended Calculators
- For Australian-only businesses: OnlineGSTCalculators.com (simple, reliable)
- For NZ-only businesses: GSTCalculatorNZ.com (NZ-specific features)
- For Xero users: Xero GST Calculator (integrated with accounting)
- For MYOB users: MYOB GST Calculator (BAS-ready)