Wind Load Calculator Intelligible · Wind Actions
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AS/NZS 1170.2:2021 · Amd 1:2023 + Amd 2:2024

Site wind speeds & pressures,
from a pin on the map.

Drop a pin anywhere in Australia and get clause-referenced design wind speeds and pressures — wind region detected from the national map, terrain sampled upwind in every direction, and a print-ready assessment report at the end.

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Region & terrain, automatically

Wind region from the 2021 national map (A0–A5, B1, B2, C, D), site elevation, and per-direction topographic multipliers sampled from real terrain up to 2 km upwind on all 8 bearings. No silent defaults — anything uncertain is asked, flagged, or blocked.

The full multiplier chain

Regional speeds, climate change, per-region directional multipliers, terrain/height, shielding and topography — assembled per Eq. 2.2 with the 30 m/s floor, three return-period bases (NCC, AS/NZS 1170.0 App F, NZ), and serviceability V25 alongside ULS.

Surface & cladding pressures

Section 5 pressures for enclosed rectangular buildings — flat, gable and hip roofs, internal pressure scenarios including the cyclonic dominant-opening rule, and local cladding zones with net design pressures for fixings.

Reports & projects

A4 print-ready assessments with clause-referenced working, schematics and a sign-off title block. Projects are stored centrally with the exact report snapshot, searchable and exportable.

Verified against the standard itself

Every table in the calculation chain — regional wind speeds, direction multipliers, terrain/height multipliers, surface pressure coefficients — has been verified against the text of AS/NZS 1170.2:2021 (2024 consolidated reissue) and AS/NZS 1170.0, with the verification trail documented and 177 automated assertions guarding the engine.

This tool assists preliminary assessment only and is not a substitute for design by a qualified structural engineer. Wind region boundaries are queried from a third-party digitisation of Figure 3.1(A); confirm critical sites against the published standard. Map & geocoding data © OpenStreetMap contributors; elevation © Geoscience Australia (FSDF).