About SiteCalc — Australian Trade Calculators for Australian Tradies

SiteCalc exists because most construction calculator sites are American. They use feet and inches, reference the International Residential Code, talk about lumber instead of timber, and calculate bags in pounds. If you're a tradie or DIYer in Australia, that's not useful.

What SiteCalc is

SiteCalc is a free collection of trade and construction calculators built specifically for Australia. Every tool is:

✔ Metric throughout — millimetres, metres, litres, and m³. No feet, no gallons, no pounds.
✔ Aligned to Australian standards — NCC, AS 1684, AS/NZS 3000, and others as applicable.
✔ Using Australian terminology — palings not pickets, lineal metres not linear feet, DAR timber not dressed lumber, joists not floor joists.
✔ Brand-neutral — no brand is recommended over another. Coverage rates and yields are drawn from published product data sheets.
✔ Free to use — no account, no email, no paywall. Supported by display advertising.

Who it's for

SiteCalc is built for two groups of people:

Licensed tradies and builders who need quick material estimates on the job or in the quote stage. The tools are deliberately simple — enter the dimensions, get the number. No login, no fuss, works on a phone in bright sunlight.

DIYers and owner-builders tackling projects at home. Whether it's a concrete slab for a new shed, painting a bedroom, tiling a bathroom, or building a deck — these tools give you a reliable starting point so you're not guessing at the hardware store.

Australian standards we reference

The table below lists the key standards that inform the calculators on this site. We cite the relevant standard on each calculator page where applicable.

Standard	What it covers	Applies to
NCC (National Construction Code)	Minimum performance requirements for building construction in Australia, including structural, fire, energy efficiency and access requirements.	Slabs, decks, stairs, footings, all structural work
AS 1684 Residential Timber Framing	Span tables and design rules for residential timber framing including joists, bearers, rafters, and posts.	Deck joists, bearers, posts
AS 3600 Concrete Structures	Design and construction of concrete structures, including minimum slab thickness, reinforcement, and durability requirements.	Concrete slabs, footings, rebar
AS/NZS 3000 Wiring Rules	Requirements for electrical installations, including voltage drop limits, cable sizing, and circuit protection.	Voltage drop calculator (Phase 3)
AS/NZS 1170 Structural Loading	Defines structural load categories including live loads, wind loads and snow loads for Australian conditions.	Deck and structural calculators
AS 3958 Ceramic Tiles	Installation of ceramic tiles including substrate preparation, adhesive selection, joint widths, and grout requirements.	Tile and grout calculators

How the estimates are calculated

Each calculator uses industry-standard formulas and published product data. For example:

Concrete bag yields are from Boral and Cockburn Cement product data sheets (20 kg = 0.010 m³, 25 kg = 0.0125 m³).
Paint coverage rates are typical ranges from Australian paint manufacturer data sheets — 12–16 m²/L on smooth surfaces, lower on porous substrates.
Tile wastage percentages are consistent with the Tile Association of Australia guidance — 10% for straight lay, 15–20% for diagonal or feature patterns.
Deck joist spacings and post sizes reference AS 1684 span tables for treated pine in standard residential applications.

Where a calculator involves a compliance check (such as stair rise and going dimensions under the NCC), the threshold values are taken directly from the referenced standard. Always verify against the current edition of the relevant standard for your project — standards are updated periodically.

Limitations and disclaimer

These calculators provide estimates intended for planning and materials ordering purposes. They are not a substitute for:

Structural or engineering design by a qualified engineer.
Building permits or council approvals required for your project.
Inspection by a licensed builder or certifier.
Site-specific assessment of soil, slope, drainage, or hazard conditions.

SiteCalc does not accept liability for errors, omissions, or results arising from use of these calculators. Always confirm quantities with your supplier and engage qualified professionals for structural, electrical, and plumbing work.

All calculators

Concrete

Painting

Tiling

Carpentry

Electrical

Plumbing

Landscaping

General