Construction & Engineering Calculators
Material quantities, area, and construction cost estimators.
Material estimates for building and home-improvement jobs — concrete, cement and sand, bricks and blocks, tiles, paint, flooring and landscaping — plus a few engineering tools for loads, stairs, roofs and pipes. Estimates start from your measurements; most let you add a wastage allowance, because real jobs always use more material than the exact geometry.
Which Construction & Engineering calculator do you need?
- Concrete for a slab, column or footingConcrete Slab CalculatorSlab volume plus cement bags, sand and aggregate at the mix you choose; separate tools handle columns and footings.
- Cement for a known concrete volumeCement CalculatorCement bags and weight for a concrete volume at the mix ratio you choose.
- Bricks and mortar for a wallBrick CalculatorBrick count and mortar volume from wall size, brick size and joint thickness.
- Tiles for a floor or wallTile CalculatorTile count from area and tile size, with wastage.
- Paint for a roomPaint CalculatorLitres of paint from wall area, coats and coverage.
- Steps for a staircaseStair CalculatorNumber of steps, riser height and tread depth from the total rise.
Browse Construction & Engineering Calculators by Type
Concrete
7 calculators
- Aggregate Calculator
- Cement Calculator
- Concrete Column Calculator
- Concrete Footing Calculator
- Concrete Slab Calculator
All Construction & Engineering Calculators
Order a little more than the calculation
Cutting, breakage, uneven surfaces and spillage mean the exact quantity is rarely enough. Use the wastage input rather than rounding up by eye, and check whether your supplier sells in whole bags, boxes or loads — that often decides the final quantity anyway.
Limitations
- Estimates for planning and budgeting; structural design needs a qualified engineer and the applicable building code.
Construction & Engineering Calculator Guides
Concrete vs Mortar: What's the Difference and When to Use Each
Concrete contains cement, sand, AND coarse aggregate, and is used for structural work (foundations, slabs, columns) that needs to bear load. Mortar contains only cement and sand (no coarse aggregate), and is used for binding masonry units together and for plastering — the two aren't interchangeable, and mixing them up wastes both material and structural strength.
Read guideFrom Square Footage to Plaster Quantity for a Wall
A wall's square footage, once converted to its square-meter dimensions, feeds directly into a plaster calculation — turning a feet-based site measurement into the exact cement and sand quantity needed for that same wall.
Read guideGravel Base and Rebar Grid for a Concrete Slab: One Project, Two Materials
The same 6m × 5m slab dimensions feed both the gravel calculator and the rebar calculator, producing the real gravel base and reinforcement grid quantities for one real project.
Read guideHow Much Gravel Do You Need? Driveway and Path Worked Examples
Gravel quantity comes down to one formula — length times width times depth, converted to weight with a density figure — but a driveway base and a garden path need very different depths and produce very different order sizes. Two worked examples show how the numbers move.
Read guideHow a Floor's Total Load Sets the UDL a Supporting Beam Must Carry
A floor's total design load, computed per square metre, converts directly into the uniformly distributed load a supporting beam must be checked against — by multiplying it by the strip width of floor the beam actually carries.
Read guideHow a Room's Floor Area and Perimeter Are Calculated
A rectangular room's floor area is length times width, and its perimeter — the total distance around all four sides — is twice the sum of length and width, a figure that turns out to be the starting point for estimating wall area too.
Read guide