Concrete, rebar & formwork
The pour, the mix behind it, the steel inside it and the forms around it.
65 calculatorsCalculators
Materials & Quantities
Concrete, gravel, mulch, brick, and tile quantity calculators.
- 663Calculators
- 19Families
- 58Method papers cited
Quantity take-off is where most estimating errors are actually made, and rarely in the geometry. The area of a floor is easy; the waste factor is not, and it depends on the lay pattern, the room shape and how much of one offcut can start the next run. The calculators here make the waste assumption explicit and adjustable rather than burying a single percentage in the arithmetic.
Every page states what it excludes, because an incomplete quantity is more dangerous than an approximate one. Adhesive, fixings, primer, trims and the preparation that a substrate needs are separate lines that a material calculation does not include — and they are consistently the items that turn an accurate take-off into a short delivery.
19 families in Materials & Quantities
Every calculator in this category sits in one of these. Open the family and the page says what it covers, what decides between its tools, and what it does not.
Bulk material conversions & haulage
Volume to weight and back, for the materials that arrive loose on a truck.
60 calculatorsPlumbing & HVAC
Air and water through a building, and the supports that carry them.
54 calculatorsFraming & carpentry
Sawn and engineered wood, and the carpentry that assembles it.
53 calculatorsExcavation, foundations & earthworks
Moving the ground, and what the ground can carry once you stop.
43 calculatorsDrywall, plaster & ceilings
Board, plaster and the framing and fixings behind them.
42 calculatorsMasonry, brick & block
Anything laid in courses and bedded in mortar or grout.
40 calculatorsFlooring & tile
What goes on top of the structural deck, and the layers under it.
37 calculatorsRoofing & flashing
Everything above the deck, from the membrane up.
36 calculatorsInsulation, waterproofing & air sealing
The layers that stop heat, air and water crossing the envelope.
35 calculatorsWindows, glazing & curtain wall
Glass, the units it is made into, and the systems that hold it.
33 calculatorsPaving, hardscape & site structures
Road, yard and footway surfaces, and the things set into and beside them.
31 calculatorsStructural steel & metalwork
Members, connections and the checks that size them.
27 calculatorsElectrical
Conductors, protection and the space they need.
26 calculatorsSiding, stucco & exterior cladding
The outer skin, and the framing and fixings that hold it off the wall.
26 calculatorsDemolition, waste & site logistics
What comes off the job, and the temporary works that exist only while it runs.
15 calculatorsAccessibility, stairs & lifts
Getting everyone through the finished building: ramps, clear floor space, stairs, lifts and sightlines.
14 calculatorsScaffolding, site safety & access
Keeping people safe while the building goes up: scaffolds, open edges, ladders and the site's temporary barriers.
14 calculatorsFire protection & compartmentation
Compartmentation, and the arithmetic of holding a fire where it started.
12 calculatorsMost used in Materials & Quantities
Concrete Calculator
Estimate how much concrete a slab needs — in cubic yards or cubic metres, and as a count of premix bags.
Imperial / Metric
Rebar Calculator
Estimate the total length of rebar — linear feet or metres — and the number of sticks needed for a rectangular grid inside a concrete slab.
Imperial / Metric
Brick Calculator
Estimate how many bricks and how much mortar you need for a wall, calculated dynamically from your brick size and mortar joint width.
Imperial / Metric
Paver Calculator
Estimate how many pavers you need for a patio or walkway, based on paver size and area.
Imperial / Metric
Stud Calculator
Count the studs, plates and corner framing for a wall run at 16 or 24 inch (400 or 600 mm) centres, including openings.
Imperial / Metric
The methods behind these numbers
- Quantity, Waste and Roundingcited by 98 calculators here
- Unit Conversion, Exactness and Roundingcited by 60 calculators here
- Volume from Geometry, and the Order That Followscited by 35 calculators here
- Mass from Volume and Densitycited by 33 calculators here