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Construction & DIY calculators
Estimate materials and measurements before your next project.
Material quantities
Estimate concrete, finishes, landscaping materials and container capacity.
Explore topic ↗6 calculatorsSlopes, layouts & dimensions
Plan simple layout measurements from rise, run and known dimensions.
Explore topic ↗All construction & diy calculators
Concrete Volume Calculator
Estimate wet concrete volume for a rectangular slab.
Paint Quantity Calculator
Estimate litres of paint for a net area and number of coats.
Tile Quantity Calculator
Estimate whole tiles for an area including a chosen waste allowance.
Flooring Packs Calculator
Estimate whole flooring packs for a room with an allowance for waste.
Brick Quantity Calculator
Estimate bricks for a net wall area using your brick-and-joint face dimensions.
Gravel Quantity Calculator
Estimate aggregate mass from area, depth and a supplied bulk density.
Wallpaper Rolls Calculator
Estimate wallpaper rolls using full-height strips and usable roll length.
Roof Pitch Calculator
Find a roof angle from its vertical rise and horizontal run.
Stair Riser Calculator
Find equal riser height from total rise and chosen number of risers.
Fence Post Calculator
Estimate posts for a straight open fence run with equal maximum spacing.
Board Feet Calculator
Calculate lumber volume in board feet from dimensions in inches and feet.
Pipe Internal Volume Calculator
Find internal pipe capacity from inner diameter and length.
Topsoil Volume Calculator
Find uncompacted topsoil volume from garden area and desired depth.
Mulch Volume Calculator
Estimate mulch volume for a circular planting bed excluding a central unmulched area.
Sand Mass Calculator
Convert required sand volume to estimated mass using a supplied bulk density.
Bagged Material Calculator
Find whole bags needed to cover a required quantity in the same units as each bag.
Ramp Slope Calculator
Calculate ramp gradient as rise over horizontal run.
Ramp Length Calculator
Calculate inclined ramp length from vertical rise and horizontal run.
Diagonal Square Check Calculator
Find the expected diagonal of a rectangular frame from its side dimensions.
Paver Quantity Calculator
Estimate rectangular pavers for an area using paver dimensions plus joint width.
Rectangular Pond Capacity Calculator
Estimate a rectangular pond’s gross water capacity from internal dimensions.
Cylindrical Tank Capacity Calculator
Calculate liquid volume in a vertical cylinder at a chosen water depth.
Drywall Sheet Calculator
Estimate whole plasterboard or drywall sheets for a net measured area.
Drywall Screw Calculator
Plan screw quantities from a manufacturer-appropriate fixing rate.
Roof Area Calculator
Estimate uniformly pitched roof surface area from a horizontal footprint.
Roofing Squares Calculator
Express a roof covering area in US roofing squares with an entered waste allowance.
Roof Shingle Bundle Calculator
Estimate whole roof-shingle bundles from product-specific coverage.
Roof Underlay Roll Calculator
Plan roofing underlay rolls using net installed coverage per roll.
Rafter Length Calculator
Estimate common-rafter slope length from a roof span, rise and overhang.
Roof Pitch Ratio Calculator
Express a roof slope in the familiar rise-in-twelve convention.
Roof Ridge Cap Calculator
Estimate ridge-cap pieces using installed linear coverage.
Siding Quantity Calculator
Estimate whole siding or cladding packs for measured exterior wall area.
Deck Board Calculator
Estimate the number of parallel boards across a rectangular deck width.
Deck Joist Quantity Calculator
Count joist positions for a simple open rectangular layout at entered maximum centres.
Wall Stud Quantity Calculator
Estimate positions of regularly spaced studs plus an explicit extra-stud allowance.
Plywood Sheet Calculator
Estimate sheet quantities for plywood or similar sheet-material coverage.
Timber Volume Calculator
Find total solid timber volume from actual board dimensions and quantity.
Lumber Weight Calculator
Estimate timber mass from measured solid volume and a chosen density.
Concrete Column Calculator
Estimate concrete volume for repeated solid round columns.
Concrete Footing Calculator
Estimate wet concrete quantity for a uniform rectangular strip footing.
Concrete Bag Calculator
Convert wet concrete demand into whole bags of a selected premix.
Post Hole Concrete Calculator
Estimate concrete around cylindrical posts in round holes.
Concrete Stair Volume Calculator
Calculate solid concrete volume for a simple repeated step profile.
Concrete Block Calculator
Estimate concrete masonry units from wall area and block-plus-joint face dimensions.
Mortar Volume Calculator
Estimate geometric mortar-joint volume from gross masonry and unit envelope volumes.
Tile Grout Quantity Calculator
Estimate tile-joint grout mass from dimensions and a supplied mixed density.
Tile Adhesive Quantity Calculator
Convert an adhesive consumption rate into whole bags for a tiling area.
Wallpaper Pattern Drop Calculator
Round wallpaper cut length up to a whole pattern repeat.
Paint Cost Calculator
Estimate paint and additional supply cost after working out the paint quantity.
Skirting Board Length Calculator
Estimate skirting or baseboard length after deducting doorway openings.
Carpet Cost Calculator
Estimate carpet spending using roll width, purchased length and fitting costs.
Insulation Pack Calculator
Estimate whole insulation packs using the selected product’s installed coverage.
Asphalt Tonnage Calculator
Estimate compacted asphalt mass from area, thickness and mix density.
Excavation Volume Calculator
Estimate excavated in-place volume for a rectangular dig.
Soil Swell Volume Calculator
Estimate loose spoil volume after a chosen expansion allowance.
Skip Load Count Calculator
Estimate waste-container loads from a loose-volume quantity and usable capacity.
Fence Rail Length Calculator
Estimate total horizontal rail length for a simple fence run.
Fence Picket Calculator
Estimate vertical fence pickets for a measured clear run and selected spacing.
Baluster Gap Calculator
Distribute equal gaps around and between a chosen number of balusters.
Stair Tread Run Calculator
Find the horizontal run of a straight stair from riser count and tread going.
Stair Stringer Length Calculator
Estimate the sloping length of a straight stair stringer.
Miter Angle Calculator
Find the equal miter-saw angle for a regular polygon frame.
Construction Contingency Calculator
Add a chosen contingency percentage to a project cost estimate.
Material Delivery Cost Per Unit Calculator
Allocate purchase and delivery spending over a material quantity.
Make your inputs count
Measure the actual site and confirm the units before ordering materials. Geometric quantities do not automatically include offcuts, breakage, compaction, pack sizes or site tolerances. Use the stated allowance fields where available and confirm specifications with your supplier.