Free browser-based engineering calculators for mechanical, electrical, hydraulic, and stormwater design. All calculations follow Australian Standards.
Rectangular and circular HVAC duct sizing. Air velocity and friction pressure drop using Darcy-Weisbach.
Water and gas pipe sizing for copper, PVC, steel, PE, and PEX. Velocity and pressure drop per metre.
Interactive psychrometric chart with property lookup and air process analysis. Sensible, latent, and total loads.
Non-domestic maximum demand per AS/NZS 3000 Table C2. Add electrical loads, apply diversity factors, get cable sizes.
Commercial 3-phase Cu XLPE sub-main and final sub-circuit sizing per AS/NZS 3008.1.1. Ambient and grouping derate, voltage drop and earth conductor in one place.
Hot and cold water pipe sizing per AS/NZS 3500.1. Loading units, hydraulic grade, and hot water recirculation.
Downpipe sizing and eaves gutter overflow provisions per AS/NZS 3500.3. Rainfall intensity lookup included.
Box gutter sizing with vertical faces, side overflow, and vertical overflow variants. Rainwater head dimensions.
Single pipe and pipe network design using Colebrook-White. PVC, concrete, and HDPE materials.
Maximum catchment area for upper roof discharging onto lower roof sheets via a spreader.
Triangular and rectangular valley gutter sizing. Critical flow depth, wave motion, and rainwater head.
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Our calculators are great for quick checks. For full project design across mechanical, electrical, hydraulic, and fire protection disciplines, get in touch with our team.