AS 3700
Freestanding Brick Wall
Check overturning stability and moment capacity of unreinforced freestanding masonry walls under wind loading per AS 3700 and AS/NZS 1170.2.
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Structural Engineering
Calculators
Practical, code-referenced calculators for everyday structural engineering in Australia. All outputs reference the relevant Australian Standard clause so you can trace every result.
Masonry — AS 3700
AS 3700
Reinforced Masonry Wall
Design compressive capacity φNd of core-filled reinforced masonry walls. Covers slenderness, eccentricity, steel contribution, and grouted sections.
Open Calculator →AS 3700:2018
Unreinforced Masonry — §7.3 Simple Rules
Design unreinforced masonry walls and piers in compression by simple rules. Derives f′m from Tables 3.1 & 3.2, checks F*d ≤ φ·k·Fuc per Table 7.1.
Open Calculator →AS 3700:2018
Unreinforced Masonry — §7.3.4 Refined
Refined compression calculation for unreinforced masonry. Accepts explicit eccentricities e₁/tw and e₂/e₁, full av range (0.75–2.5), and computes k from Cl. 7.3.4.5 formulas — generally less conservative than simple rules.
Open Calculator →Timber Framing — AS 1684.2
AS 1684.2
Table 1 — Floor Bearers FLW 1200
Select timber grade, wind class, span type and roof load width to find maximum bearer span per AS 1684.2 Table 1.
Open Calculator →AS 1684.2
Table 2 — Floor Bearers FLW 2400
Select timber grade, wind class, span type and roof load width to find maximum bearer span per AS 1684.2 Table 2.
Open Calculator →AS 1684.2
Table 3 — Floor Bearers FLW 3600
Select timber grade, wind class, span type and roof load width to find maximum bearer span per AS 1684.2 Table 3.
Open Calculator →AS 1684.2
Table 4 — Floor Bearers FLW 4800
Select timber grade, wind class, span type and roof load width to find maximum bearer span per AS 1684.2 Table 4.
Open Calculator →AS 1684.2
Table 5 — Floor Bearers (Floor Load Only)
Select timber grade, span type and floor load width to find maximum bearer span per AS 1684.2 Table 5 — no roof load.
Open Calculator →AS 1684.2
Table 6 — Floor Joists
Select timber grade, wind class, roof type, span type, joist spacing and roof load width to find maximum floor joist span per AS 1684.2 Table 6.
Open Calculator →AS 1684.2
Table 7 — Wall Studs (Not Notched)
Select timber grade, wind class, stud spacing, roof type and rafter spacing to find maximum roof load width per AS 1684.2 Table 7.
Open Calculator →AS 1684.2
Table 8 — Wall Studs (Notched 20 mm)
Select timber grade, wind class, stud spacing, roof type and rafter spacing to find maximum roof load width for notched studs per AS 1684.2 Table 8.
Open Calculator →AS 1684.2
Table 9 — Studs Supporting Concentrated Loads (Not Notched)
Select timber grade, wind class, roof type and stud height to find maximum roof area supported per AS 1684.2 Table 9.
Open Calculator →AS 1684.2
Table 10 — Studs Supporting Concentrated Loads (Notched 20 mm)
Select timber grade, wind class, roof type and stud height to find maximum roof area for notched studs per AS 1684.2 Table 10.
Open Calculator →AS 1684.2
Table 11 — Jamb Studs (Single or Upper Storey)
Select timber grade, wind class, roof type and roof load width to find maximum width of opening per AS 1684.2 Table 11.
Open Calculator →AS 1684.2
Table 12 — Internal Loadbearing Wall Studs
Select timber grade, wind class, stud spacing, rafter/truss spacing and roof type to find maximum roof load width for internal loadbearing wall studs (not notched) per AS 1684.2 Table 12.
Open Calculator →AS 1684.2
Table 13 — Internal Loadbearing Wall Studs (Notched 20 mm)
Select timber grade, wind class, stud spacing, rafter/truss spacing and roof type to find maximum roof load width for notched (20 mm) internal loadbearing wall studs per AS 1684.2 Table 13.
Open Calculator →AS 1684.2
Table 14 — Bottom Plates (Single or Upper Storey)
Select timber grade, wind class, joist spacing, rafter/truss spacing and roof type to find maximum roof load width for bottom plates (single or upper storey) per AS 1684.2 Table 14.
Open Calculator →AS 1684.2
Table 15 — Top Plates (Sheet Roof, Single or Upper Storey)
Select timber grade, wind class, stud spacing, rafter/truss spacing and tie-down spacing to find maximum roof load width for top plates under sheet roofs per AS 1684.2 Table 15.
Open Calculator →AS 1684.2
Table 16 — Top Plates (Tile Roof, Single or Upper Storey)
Select timber grade, wind class, stud spacing, rafter/truss spacing and tie-down spacing to find maximum roof load width for top plates under tile roofs per AS 1684.2 Table 16.
Open Calculator →AS 1684.2
Tables 17 & 18 — Lintels (Single or Upper Storey)
Select timber grade, wind class, roof load width, rafter/truss spacing and roof type (sheet T17 / tile T18) to find maximum lintel span for single or upper storey loadbearing walls per AS 1684.2.
Open Calculator →AS 1684.2
Tables 19 & 20 — Lintels (Concentrated Roof Loads)
Select timber grade, wind class, roof load width, roof area supported and roof type (sheet T19 / tile T20) to find maximum lintel span for lintels supporting concentrated roof loads per AS 1684.2.
Open Calculator →AS 1684.2
Tables 21 & 22 — Ceiling Joists
Select timber grade, overbatten (T21 none / T22 with), span type and joist spacing to find maximum ceiling joist span supporting ceiling loads per AS 1684.2.
Open Calculator →AS 1684.2
Tables 23 & 24 — Hanging Beams & Counter Beams
Select timber grade and ceiling load width to find maximum hanging beam span (T23), or counter beam spacing to find maximum counter beam span (T24) per AS 1684.2.
Open Calculator →AS 1684.2
Table 25 — Strutting/Hanging Beams (Roof + Ceiling)
Select roof type, timber grade, ceiling load width and roof area supported to find maximum strutting/hanging beam span supporting combined roof and ceiling loads per AS 1684.2 Table 25.
Open Calculator →AS 1684.2
Table 26 — Strutting/Counter Beams (Roof + Ceiling)
Select roof type, timber grade, effective beam spacing and roof area supported to find maximum strutting/counter beam span supporting combined roof and ceiling loads per AS 1684.2 Table 26.
Open Calculator →AS 1684.2
Table 27 — Strutting Beams (Roof Load Only)
Select roof type, timber grade and roof area supported to find maximum strutting beam span supporting roof loads only (no ceiling load) per AS 1684.2 Table 27.
Open Calculator →AS 1684.2
Table 28 — Underpurlins
Select timber grade, roof type or span type, roof mass, roof load width and rafter spacing to find maximum underpurlin span per AS 1684.2 Table 28.
Open Calculator →AS 1684.2
Table 29 — Rafters or Purlins
Select timber grade, span type (single/continuous), roof mass and rafter spacing to find maximum rafter or purlin span and overhang per AS 1684.2 Table 29.
Open Calculator →AS 1684.2
Tables 30/31 — Ridge & Intermediate Beams
Select span type (single/continuous), timber grade, roof and ceiling mass, and roof load width to find maximum ridge or intermediate beam span and overhang per AS 1684.2 Tables 30 and 31.
Open Calculator →AS 1684.2
Table 32 — Roof Battens
Select timber grade, roof type (sheet/tile) and batten spacing to find maximum roof batten span and overhang per AS 1684.2 Table 32.
Open Calculator →AS 1684.2
Tables 33/34 — Floor Bearers (Lower Storey, Two Storey)
Select lower floor width (1800/3600 mm), timber grade, roof type, span type, upper floor load width and roof load width to find maximum floor bearer span supporting two-storey loadbearing walls per AS 1684.2 Tables 33 and 34.
Open Calculator →AS 1684.2
Table 35 — Floor Bearers (Lower Storey, Floor Loads Only)
Select timber grade, span type, upper floor load width and lower floor load width to find maximum floor bearer span supporting upper and lower floor loads only (no roof) per AS 1684.2 Table 35.
Open Calculator →AS 1684.2
Tables 36/37 — Wall Studs (Lower Storey Loadbearing)
Select timber grade, stud spacing, floor joist spacing, roof type and upper floor load width to find the maximum roof load width for lower storey loadbearing wall studs (not notched T36 / notched 20 mm T37) per AS 1684.2.
Open Calculator →AS 1684.2
Tables 38/39 — Studs Supporting Concentrated Floor Loads (Lower Storey)
Select timber grade and notching condition to find the maximum floor area supported by studs carrying concentrated floor loads from upper floor bearers in lower storey of two storey construction, per AS 1684.2 Tables 38 and 39.
Open Calculator →AS 1684.2
Table 40 — Jamb Studs Lower Storey (FLW 1800 mm)
Select timber grade, wind class, roof type and roof load width to find maximum width of opening for lower storey jamb studs (upper FLW 1800 mm) per AS 1684.2 Table 40.
Open Calculator →AS 1684.2
Table 41 — Jamb Studs Lower Storey (FLW 3600 mm)
Select timber grade, wind class, roof type and roof load width to find maximum width of opening for lower storey jamb studs (upper FLW 3600 mm) per AS 1684.2 Table 41.
Open Calculator →AS 1684.2
Table 42 — Jamb Studs Lower Storey (FLW 4800 mm)
Select timber grade, wind class, roof type and roof load width to find maximum width of opening for lower storey jamb studs (upper FLW 4800 mm) per AS 1684.2 Table 42.
Open Calculator →AS 1684.2
Table 43 — Internal Loadbearing Wall Studs — Lower Storey (Not Notched)
Select timber grade, wind class, stud spacing and upper floor joist spacing to find maximum floor load width for lower storey internal loadbearing wall studs (not notched) per AS 1684.2 Table 43.
Open Calculator →AS 1684.2
Table 44 — Internal Loadbearing Wall Studs — Lower Storey (Notched 20 mm)
Select timber grade, wind class, stud spacing and upper floor joist spacing to find maximum floor load width for notched lower storey internal loadbearing wall studs per AS 1684.2 Table 44.
Open Calculator →AS 1684.2
Table 45 — Bottom Plates (Lower Storey of Two Storey)
Select timber grade, wind class, lower joist spacing, upper floor load width, upper joist spacing and roof type to find maximum roof load width for lower storey bottom plates per AS 1684.2 Table 45.
Open Calculator →AS 1684.2
Table 46 — Top Plates (Lower Storey of Two Storey)
Select timber grade, wind class, stud height, upper floor load width, upper joist spacing and roof type to find maximum roof load width for lower storey top plates per AS 1684.2 Table 46.
Open Calculator →AS 1684.2
Tables 47 & 48 — Lintels (Lower Storey of Two Storey)
Select timber grade, wind class, roof load width, upper floor load width and roof type (sheet T47 / tile T48) to find maximum lintel span for lower storey loadbearing walls per AS 1684.2.
Open Calculator →AS 1684.2
Table 49 — Deck Bearers
Span table for deck bearers more than 1 m off the ground. Select timber grade, floor load width (FLW) and span condition. Covers 15 timber grades including F, MGP and hardwood. Reverse lookup to find all sizes achieving a required span.
Open Calculator →AS 1684.2
Table 50 — Deck Joists
Span table for deck joists more than 1 m off the ground. Select timber grade, joist spacing (300/450/600 mm) and span condition. Covers 15 timber grades. Reverse lookup to find all sizes achieving a required span.
Open Calculator →AS 1684.2
Tables 51/51A — Verandah Beams
Span table for single-span verandah beams. Select wind class, timber grade, roof load width, beam spacing and roof mass. Covers 15 grades (MGP and F-series). Reverse lookup to find all sizes achieving a required span.
Open Calculator →AS 1684.2
Table 52 — Verandah Beams (Continuous Span)
Span table for continuous-span verandah beams. Select wind class, timber grade, roof load width, beam spacing and roof mass. Covers 15 grades (MGP and F-series). Reverse lookup to find all sizes achieving a required span.
Open Calculator →AS 1684.2
Table 53 — Posts (Roof and/or Floor Loads)
Maximum post height for posts supporting roof and/or floor loads. Select wind class, timber grade, roof type (sheet/tile), floor load area and roof load area. Covers 15 grades. Reverse lookup to find all sizes achieving a required height.
Open Calculator →Analysis — Geometry & Stress
Analysis
Beam Analysis — SFD / BMD / Deflection
Simply supported, cantilever, or propped cantilever beam with any combination of point loads, UDLs, and applied moments. Outputs reactions, shear force diagram, bending moment diagram, and deflection curve.
Open Calculator →Geometry
Slope Calculator
Convert between all slope notations instantly: degrees, percent grade, per mille, V:H gradient, H:V batter and 1 in N. Enter any one value — all others update live. Includes a dynamic 2D diagram and a reference table of common design slopes.
Open Calculator →Geometry
Triangle Solver
Solve any triangle from 3 known values — sides and/or angles. Supports SSS, SAS, ASA, AAS and SSA (ambiguous case flagged). Full working shown with scaled diagram.
Open Calculator →Statics
Point Force Resultant
Add any number of force vectors at a point and instantly find the resultant magnitude and direction. Includes a concurrent force diagram, force polygon, component working table, equilibrium check, and required balancing force.
Open Calculator →Analysis
Mohr's Circle — Stress & Strain
2D stress and strain transformation using Mohr's Circle. Inputs: σx, σy, τxy (or εx, εy, γxy). Outputs: principal stresses, maximum shear, principal angle. Interactive rotation slider shows transformed stresses at any angle.
Open Calculator →Geotechnical — Foundations
Geotech
Pool Weight Calculator
Concrete pool shell + water weight, bearing pressure and pile design.
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Pile Capacity Calculator
Circular pile allowable capacity from shaft adhesion and end bearing — allowable stress design.
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