NZS 3604:2011
Buildable
The builder’s reference, in your pocket. Ten timber-framing calculators built for the New Zealand job site — fast, offline, and straight off the Standard.
Stop thumbing through the Standard on the tailgate.
Buildable puts NZS 3604:2011 timber-framed building calculations on your phone and tablet. Punch in your numbers, get your answer, get back to work — every result references the exact table it came from.
See it on site
Ten calculators inside
Member Sizer
Joists, rafters & lintels from the NZS 3604 span tables (7.3, 7.4, 8.2, 8.3, 9.2, 9.3).
Bracing Calculator
Section 5 demand (wind + earthquake) and Table 8.1 capacities, with a live sufficient / insufficient check.
Wind Zone Finder
Look up your site's wind zone by location.
Span Tables
Browse the full set of NZS 3604 tables on the spot.
3-4-5 Square
Set out and check square corners.
Baluster Spacing
Even spacing with a ≤100 mm gap, every time.
Stair Calculator
Risers, going & pitch checked against D1/AS1.
Roof Pitch
Convert between degrees, ratio and rafter length.
Concrete
Volume and bag count.
Timber Treatment
Pick the right H-class (NZS 3640).
Free, or one-time Pro
Buildable
Free
- All ten calculators, in full
- Works offline on iPhone & iPad
- Supported by a single banner ad
Buildable Pro
One-time purchase
- No ads — nothing between you and the numbers
- A one-time purchase, no subscriptions, ever
- Backs a small NZ developer who’d rather sell you a tool than rent it
Honest results
NZS 3604:2011 covers timber-framed buildings up to 10 m wall height and two storeys. Buildable’s calculations are indicative and reference the table behind them — always confirm with a Licensed Building Practitioner before lodging for consent.