Overview

About the Calculator

Quickly calculate seismic loads using our AS 1170.4:2024 compliant Seismic Analysis Calculator. Designed for structural engineers in Australia, with automatic base shear, EDC classification, and lateral force distribution for buildings.

Built for seismic design under AS 1170.4:2024

Easily determine seismic loads for structures across Earthquake Design Categories I and II, as well as domestic housing. Designed specifically for Australian engineers, this calculator aligns with AS 1170.4:2024 and AS 1170.0:2002, taking the guesswork out of site classification, base shear, and story force distribution.

Accurate base shear and lateral forces per story

The calculator automatically computes seismic base shear and lateral forces acting on each story. Ideal for engineers designing timber, steel, or concrete frames. Story forces are calculated using inputs like effective seismic weight and elevation, with outputs mapped clearly to structural levels.

Supports residential and commercial projects

Designed with practical limits in mind, the tool supports buildings under 50m high. Perfect for residential builds, schools, warehouses, and low- to mid-rise offices. Exceptional structures (Importance Level 5) and complex EDC III scenarios are currently excluded, keeping the interface simple and relevant to common use cases.

Fast classification of Earthquake Design Category (EDC)

No need to manually cross-reference standards. The calculator evaluates key site and building parameters, including hazard factor, soil class, height, and importance level, to determine EDC I or II instantly. This makes it easy to stay compliant with NCC 2022 and avoid over- or under-design.

Why ClearCalcs?

Frustration to Flow

See how ClearCalcs transforms structural calculations from a tedious, error-prone chore into an efficient, stress-free process.

With spreadsheets and clunky software

Frustration, fuss, and fragile formulas—the old way of engineering calculations that holds you back

Struggle with endless spreadsheets and custom formulas.

Building codes change, but outdated software and spreadsheets don’t.

Triple-check and verify manual input at every turn.

Old software feels like a maze, with unclear settings, limited templates, and rigid interfaces.

With ClearCalcs

Effortless, efficient engineering calculations at your fingertips.

100+ pre-built calculators for different materials.

Every calculation comply with the latest codes and standards.

Forget the worry of “black box” calculations; verify calculators with inline formulas, codes, and checks.

Intuitive tools built to your workflow, plus unmatched customer support.

How It Works

Your code-compliant calculator

Tired of complex calculations? ClearCalcs Calculator Library keeps it simple, secure and code-compliant – so you can calculate with confidence.

Save time with ready-to-use templates for wood, steel, and concrete

ClearCalcs offers an extensive library of easy-to-use calculators for beams, columns, and footings, designed to make structural calculations simpler and faster.

Choose from a wide range of pre-configured beam and column options, complete with automatic member sizing, so you can quickly reach reliable designs and reduce rework.

Beams

Columns

Foundations

Walls

Loads

Dynamically track your load paths from roof to foundation

No need to copy and paste reactions between calculations! If the top calculator's reactions change, the loads being inherited onto the lower calculator will update automatically. This includes all loads such as dead, live, snow, seismic, and wind.

Submit professional reports for permit review

ClearCalcs is not only easy to use, but also easy to check! All calculations follow an easy to understand traffic light check system, with multiple levels of detail available giving you the choice of printing every step of the calculation and all code and standard references, or simply a compact, one-page print out.

Report heading includes your project name and address

Easily upload your organization logo for a professional report

Use custom PDF upload to merge additional documents to your structural calculations

Download a sample report

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Seismic Analysis Calculator for AS 1170.4:2024