Precision Meter Sizing
Stop over-sizing meters. Calculate the correct diversified gas load for domestic installations in Western Australia, automatically applying ATCO TN09 factors to ensure you specify the exact meter capacity required.
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Why Professionals Use This Tool
Stop risking compliance failures on manual math and generic approximations. GasCalc transforms complex AS/NZS 5601 regulatory requirements into a rapid, error-free digital workflow. Bring absolute certainty, unprecedented speed, and audit-ready documentation to every gas fitting project.
Instant Appliance Diversity
Enter the MJ/hr ratings of all connected appliances. The calculator automatically applies the specific load diversity factors (e.g., 0.8, 0.6, 0.4) dictated by ATCO guidelines.
Automated Hot Water Rules
Complex multi-HWS logic is handled seamlessly. The system applies a 0.8 factor to the primary instantaneous water heater and automatically reduces the factor to 0.2 for all secondary units.
Direct Meter Recommendations
No more comparing loads against pressure tables. Select your network pressure (1.25 kPa or 2.75 kPa), and GasCalc instantly outputs the required meter size (e.g., AL8, AL10, AL12).
How the Calculator Works
The Diversity Calculator takes the guesswork out of ATCO Gas Australia's TN09 Technical Notice, protecting you from under-sizing penalties and over-sizing costs.
Select the Network
Define the gas type (Natural Gas or Albany LPG) and the available network pressure (Low or Medium) to set the correct baseline capacities.
Build the Load List
Add all connected gas appliances. The calculator dynamically applies the appropriate TN09 mathematical factor based on the appliance category.
Get Your Meter Size
GasCalc outputs the total undiversified load, the final diversified peak load, and explicitly recommends the correct AL series meter for the installation.
Compliance & Standards
ATCO Technical Notice TN09: This calculator strictly enforces the diversity formula required for domestic meter sizing in the WA network.
Oversize Warnings: If a calculated load exceeds standard AL series limits, GasCalc explicitly warns you that a custom installation is required, prompting you to consult the network operator.
GasCalc automatically handles the unique capacity constraints of the Albany LPG network.
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