Australian Construction Calculators · 306 Tools
Construction estimates, with the maths shown.
Free, instant, Australian metric.
Concrete volumes. Roof tiles. Paint litres. Boiler sizes. Every formula is shown, every number is editable, and nothing leaves your browser.
Plan a whole job
Goes further than a single figure — set out a whole floor and see where every cut lands before you order.
- Set-out Tile & Paving Layout Planner See where the cuts land before you order. Compare start positions, work round cut-outs, and export the drawing and cut list.
- Take-off Estimator Turn results from these calculators into a priced estimate. Materials from every section combine into one order list, rounded to whole packs once, and print as a quote. Works without an account.
Most-used calculators
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Concrete Slab Calculator
Calculates concrete volume for slabs, paths, and driveways
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Colorbond Roofing Calculator
Estimates metal roof panels, screws, and trim for standing seam and corrugated
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Paint Calculator
Calculates litres or gallons of paint for walls, ceilings, and trim
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Brick Calculator
Estimates bricks for walls
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Ceiling / Roof Insulation Calculator
Calculates rolls of mineral-wool ceiling insulation
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Home Extension Cost Calculator
Estimates build cost for extensions per m² or ft²
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Concrete & Foundations (17)
View all →Roofing (16)
View all →Timber & Framing (13)
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View all →Solar Sizing (7)
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View all →From the blog
All posts →-
Timber & Framing How Many Decking Boards Do I Need Rows across the deck, running length along it, whole boards to cover that length. The formula, a worked example carried through in metric with imperial equivalents, the gap and wastage allowances that shift the count, and the board sizes that the same question travels under in the UK, North America and Australia. -
Timber & Framing Board Feet and Timber Volume Explained A board foot is a unit of volume, not of length, and a cubic metre holds 423.8 of them. The formulas both ways, a worked example in metric with imperial equivalents, and the nominal-versus-finished distinction that inflates most timber tallies by about half. -
Roofing Flat Roof Materials: EPDM, GRP and Felt Coverage Flat roof materials are ordered against the covering, not the deck. The formula, a worked example on a 32.4 m² extension roof, and where upstands and laps add a fifth to the order.
Estimates, not advice.
BuildMetricLab is a planning tool. Results are intended to help you scope a job and request quotes — they are not a substitute for a qualified trade quote, structural engineer's calculation, or National Construction Code (NCC) sign-off. Always verify with a professional before ordering materials or starting works.