Calculate Smarter.
Ensure Compliance.
The ultimate toolkit for AU/NZ Gasfitting professionals.
Streamline complex calculations and reporting for AS/NZS 5601.1, AS 3814, and AS 1375 on any device.
Trusted by 1,000+ Professionals
AS/NZS 5601.1
AS 3814 & AS 1375
Engineered to Code
Built for the Modern Trade
Stop wasting time thumbing through appendices. GasCalc digitizes complex compliance math so you can quote faster and eliminate rework.
Guaranteed Compliance
Built precisely on the methodologies of AS/NZS 5601.1:2022 and AS 3814. Always up-to-date with jurisdictional amendments.
Save Hours Per Week
Get complex calculations done in seconds. Produce instant PDF reports for inspectors directly from the field.
Reduce Material Waste
Eliminate sizing errors. Ensure your pipe networks are optimized to avoid over-specifying expensive copper or PEX.
Works on Any Device
A seamless progressive web app. Access every calculator on your phone, tablet, or desktop. No app store required.
The Complete Professional Suite
Explore 16+ precision-engineered calculators designed for Type A domestic installations and Type B industrial commissioning.
Type A Installations
AS/NZS 5601.1 Compliance
Pipe Sizing
Drag & drop formula sizing.
Tightness Testing
App E leak rate tracking.
Appliance Ventilation
Complex room airflow math.
Equipment Enclosure Ventilation
Free area requirements.
Flue Design
App H compliance sizing.
Power Flue Design
Fan assisted extraction.
Gas Meter Diversity
ATCO WA specific sizing.
Indoor Breather Vent Discharge
Indoor dilution compliance.
Pipework Purging
Cylinder & volume math.
LP Gas Cylinders
Exclusion zones & limits.
Flue Terminal Clearances
Safe terminal placement.
Quick Utilities
Conversions, Volume & Vents.
Type B Appliances
AS 3814 & AS 1375 Standards
Start Gas Methods
Critical time verification.
Gas Rate
Burner input calculation.
Mechanical Purge Time
Safe ignition timing.
Natural Draught Purge
Vent area sizing.
Airflow Rate
Velocity & duct sizing.
CO/CO₂ Ratio
Combustion analysis.
Explosion Relief
Panel weight & area limits.
Thermocouple Diagnostics
Millivolt Load Testing (30mV).
Valve Train Configurator
AS 3814 compliance builder.
Oven Dilution
AS 1375 compliance dilution.
Quick Utilities
Conversions, Volume & Vents.
Trusted by Industry Experts
"Used to spend ages thumbing through 5601 tables in the van. Now, I can knock out a quote on the spot in a few minutes. Bloody brilliant, Cheers."
Neill
Newtown, Geelong, VIC
"No more second-guessing my pipe sizing. I punch in the numbers, get the right answer, and I have complete confidence the job is compliant."
Eddie S
North Wollongong, NSW
"This app has saved me a fortune on materials. It sizes the pipes perfectly, so I'm not wasting money on copper."
Chris C
Kelso, Townsville, QLD
"Having everything on my tablet or phone is a game-changer. My standards were always getting wet or ripped, The calculation breakdowns have made Type B submissions so much easier."
Daz P
Sunshine Coast, QLD
"The time I save on quoting alone is ridiculous. I can fit a few extra jobs in a week. The app paid for itself on day one."
Rob
Maida Vale, WA
"The ventilation calculator is a game-changer. Simple as that. If you're a gasfitter in Aus or NZ, you need this."
Andy
High Wycombe, WA
Simple, Risk-Free Pricing
Try every calculator on your real jobs for 30 days free ($0 today). Lock in our early adopter launch rate of just $10/month instead of standard $25/mo—cancel anytime in 1 click.
Type A Pass
For residential & commercial gas fitters working to AS/NZS 5601.1.
Single passes are usually $15/mo. Launch deal includes Full Pro for $10/mo.
- Visual Pipe Sizing
- Pipe Pressure Drop
- Appliance Ventilation
- Enclosure Ventilation
- Natural Flue Design
- Power Flue Design
- Tightness Testing (App E)
- Gas Meter Diversity
- Room Volume Helper
Upgraded to Full Pro Suite at $10/mo launch rate.
Pro Access
The ultimate, all-in-one solution for the versatile gas professional.
Only $10/mo locked in for life. You will never be billed standard $25/mo.
- Everything in Type A Pass
- All Type B Calculators (AS 3814)
- Job Reporting & PDF Export
- Priority Email Support
$0 charged today. Then $10/mo launch rate. Cancel anytime.
Type B Pass
For industrial technicians working to AS 3814 & AS 1375.
Single passes are usually $15/mo. Launch deal includes Full Pro for $10/mo.
- Gas Rate Verification
- Heat Input Math
- Start Gas & Purge Volumes
- Critical Time Math
- Mechanical Purging
- Natural Purging
- CO/CO₂ Ratio Math
- Airflow Mathematics
- Combustion Assessments
Upgraded to Full Pro Suite at $10/mo launch rate.
Frequently Asked Questions
Have questions about standards compliance, offline capabilities, or billing? Here are answers to common questions about using GasCalc.
Are the calculations based on current AS/NZS standards?
Yes. All calculations are updated regularly to align with the latest editions of relevant standards, including AS/NZS 5601.1, AS 3814, and AS 1375.
GasCalc serves as a fast, reliable verification companion on-site to help you double-check compliance alongside your official standards.
Can I use GasCalc on multiple devices?
Yes! You can log in to your GasCalc account on your phone, tablet, and laptop.
Your saved jobs and custom reports will automatically sync across all your devices, making it easy to start a calculation on-site and finalize the PDF report back at the office.
Does GasCalc work on remote job sites without internet connection?
Yes. GasCalc operates as a Progressive Web App (PWA). Once you visit the app online for the first time, it installs files locally in your browser cache. This allows you to run all calculators and enter measurements on-site even in deep basements or remote areas with no mobile coverage or reception.
How does the 30-Day Free Trial work? Can I cancel anytime?
Your first 30 days are 100% free with $0 charged today. You get unlimited, unrestricted access to every AS/NZS compliance calculator, visual pipe sizing, flue sizing, purge calculators, and PDF report generation.
If GasCalc isn't right for your workflow, you can cancel anytime with a single click inside your account settings before the 30 days are up and you won't be charged a single cent. After your trial, your subscription continues at our exclusive launch rate of just $10/month—which is locked in permanently as an early adopter (you will never be charged the standard $25/mo). No contracts, no lock-ins, cancel whenever you like.
Ready to Revolutionize Your Workflow?
Try every calculator on your real jobs with full access for 30 days. $0 charged today, cancel anytime with 1 click.
Start 30-Day Free Trial — $0 Today