Fast, accurate, and 100% compliant with AS 1684 (Residential Timber-Framed Construction) and NCC Volume 2 (National Construction Code). Built specifically for licensed builders, carpenters, chippies, and TAFE apprentices working across Australia.
Why Aussie Carpenters Need Local Tools
Generic overseas carpentry calculators use American feet and inches, imperial lumber sizes (2x4, 2x6), and building codes that have zero relevance on an Australian job site. When you're out in the ute setting out a pitched roof or checking bearer spans, you need calculations grounded in metric units: millimetres (mm), metres (m), and square metres (m²).
Our suite of free online carpentry tools is engineered specifically around Australian timber stress grades (MGP10, MGP12, F5, F7, F17 hardwood) and National Construction Code rules to help you work faster and avoid certifier defects.
AS 1684 & NCC Framing Standards Summary
- AS 1684.2 & AS 1684.3: National standards for non-cyclonic and cyclonic residential timber framing. Defines maximum allowable spans for floor bearers, floor joists, wall studs, lintels, ceiling joists, and roof rafters.
- NCC Part 3.9.1 (Stair Construction): Mandates stair riser heights (115mm min to 190mm max) and going lengths (240mm min to 355mm max) with a 2R + G ratio limit of 550mm to 700mm.
- NCC Part 3.9.2 (Balustrades & Handrails): Enforces the mandatory 125mm sphere rule — no clear gap between balusters or below the bottom rail can allow a 125mm sphere to pass through.
- Roof Framing & Geometry: Standard roof pitches across Australia range from 15° to 30°. Pitch multipliers adjust plan floor area to true sloping roof area for ordering metal cladding sheets or tiles.
Who Uses These Calculators?
- Licensed Builders & Carpenters: Verify timber span tables, wall stud layouts, and lintel sizes before placing timber yard orders.
- Roofing & Truss Crews: Calculate pitch rise, run, rafter lengths, hip angles, and truss quantities directly on site.
- Stair Builders & Joiners: Compute exact riser/going steps and stringer cut angles to pass building inspections first time.
- Decking & Outdoor Contractors: Estimate post spacing, bearer/joist timber sizes, and baluster layouts to NCC rules.
- Apprentices & TAFE Students: Learn timber framing trigonometry and AS 1684 standards with practical, real-world metric calculations.
Step-by-Step On-Site Framing & Roofing Workflow
Streamline your job site setup and avoid costly timber re-orders:
- Roof Pitch & Rafters: Use the Roof Pitch Calculator to compute rise, run, rafter length, and pitch angle.
- Check Timber Spans: Verify joist, bearer, and rafter spans against AS 1684 tables using the Timber Span Calculator.
- Wall Framing & Studs: Calculate stud count, top/bottom plates, and noggings with the Wall Framing Calculator.
- Stairs & Balustrades: Layout stair rise/going steps with the Stair Calculator and verify baluster gaps on the Baluster Spacing Calculator.
Explore Other Trade Categories
Need calculations for other trade scopes on site? Access our specialized trade hubs:
- Plumber Calculators Hub — AS/NZS 3500 Water Pipe Sizing, Drainage, Gas & Stormwater.
- Electrician Calculators Hub — AS/NZS 3008 Cable Sizing, Voltage Drop, Fault Loop & Max Demand.
- Bricklayer Calculator — Brick count, mortar volume & wall area estimation.
- Painter Calculator — Paint coverage, coat volume & wall surface area.
Trade Compliance Note: All carpentry calculations conform to AS 1684 timber framing standards and the National Construction Code (NCC) Volume 2. Always verify structural engineering drawings for non-standard load conditions.