All Construction Calculators

How many anchor bolts do I need? Free calculator for J-bolt & wedge types at standard 1.8 m spacing — includes total count and layout tips.

Sill seal calculator: Estimate foam gasket rolls by foundation perimeter. Free tool for 90 mm & 140 mm widths — prevents air infiltration.

How much pressure treated timber for sill plates? Instant calculator for 100×50 mm & 150×50 mm PT boards — gives linear metres and board count.

How much concrete do I need? Free calculator for slabs, footings & columns — gives cubic metres and bag counts with waste factor.

How much concrete for a slab? Free calculator for garage, patio & driveway slabs — gives cubic metres and bag count for any thickness.

Concrete footing calculator: Estimate cubic metres for continuous & spread footings. Free tool for foundation walls — includes waste factor.

How much concrete for column piers? Free column calculator for 200 mm, 250 mm & 300 mm diameter piers — gives cubic metres per column and total.

Concrete steps calculator: How many cubic metres for stairs? Free tool — enter width, rise, run & step count for instant estimate.

Rim joist calculator: How many boards for your floor perimeter? Free tool for common timber sizes — includes board count and linear metres.

Floor joist calculator: Estimate joists by span and spacing. Free sizing tool for 400 mm or 600 mm centres — includes total board count.

How many rows of bridging do I need? Free calculator for timber cross-bridging & solid blocking by joist span — instant results.

Subfloor adhesive calculator: How many tubes of construction adhesive? Free estimator based on floor area — covers standard cartridge sizes.

How many OSB sheets do I need? Free calculator for 1200×2400 mm subfloor panels — accounts for waste and gives exact sheet count.

How many studs do I need? Free wall stud calculator for 400 mm & 600 mm centres — includes extras for corners, doors, and window openings.

Bottom plate calculator: Estimate sole plates by wall length. Free tool that gives board count and total linear metres needed.

How much timber for double top plates? Free calculator — gives exact board count with overlap stagger included.

Header calculator: What size header for my opening? Free tool for door & window spans — covers common header sizes.

How many sheets of sheathing for exterior walls? Free calculator for OSB & plywood panels — includes waste factor estimates.

How many roof trusses do I need? Free calculator for 600 mm standard spacing — enter roof length for instant truss count and layout.

Rafter calculator: Estimate rafter count by roof length & spacing. Free tool for 400 mm and 600 mm centres — works for gable and hip roofs.

Ridge board calculator: How many boards for my roof peak? Free tool for standard ridge board sizes — gives length and count.

How many OSB sheets to sheathe my roof? Free roof decking calculator for 1200×2400 mm panels — factors in roof pitch and waste.

Shingle calculator: How many bundles do I need? Free estimator for standard shingles — converts square metres to bundles.

How many rolls of roofing underlayment? Free calculator for breathable membrane & felt — accounts for overlap and waste.

Drip edge calculator: Estimate linear metres of flashing for your roof. Free tool — gives piece count for standard drip edge strips.

What pitch is my roof? Free roof pitch calculator — enter rise & run for instant angle, slope %, and area multiplier.

Roof area calculator: Convert flat dimensions to actual roof area. Free tool — accounts for pitch multiplier, gives roofing squares.

How steep is my roof? Free slope calculator — measure rise & run to get pitch ratio, angle, and recommended roofing material type.

How many rolls of breather membrane do I need? Free calculator by wall area — covers standard roll widths with overlap.

Vinyl cladding calculator: Estimate panels by wall area in square metres. Free tool that accounts for doors, windows & 10% waste.

How many HardiePlank boards do I need? Free fibre cement cladding calculator — with waste included.

Window flashing tape calculator: Estimate linear metres for all openings. Free tool for self-adhesive flashing tape.

How many insulation batts do I need? Free calculator for mineral wool and PIR insulation — covers standard wall cavities.

How much plasterboard do I need? Free calculator for 12.5 mm & 15 mm sheets — estimates 1200×2400 mm boards for walls and ceilings.

Plasterboard screw calculator: How many screws per board? Free estimator — gives total count and boxes needed.

How much jointing compound do I need? Free calculator for plasterboard finishing — estimates buckets for taping, bedding & skim coats.

Framing nail calculator: How many kilograms of nails for my project? Free tool for standard framing nails — based on stud count.

How many joist hangers do I need? Free calculator for standard joist hanger connectors — covers floor and ceiling joist framing.

Truss clip calculator: Estimate rafter-to-wall connectors for wind resistance. Free tool for standard truss clips and straps.

How much does timber cost? Free calculator for common structural timber sizes — estimates total cost by quantity and current prices in £.

Board feet calculator: Convert timber dimensions to board feet. Free tool for hardwood pricing — instant BF and cost estimate.

How many plywood sheets do I need? Free calculator for 6 mm to 18 mm panels — gives sheet count and cost estimate in £.

How much paint do I need? Free coverage calculator for walls & ceilings — accounts for coats, gives litres and tin count.

Paint cost calculator: Estimate total project cost by quality level. Free tool for trade to premium — includes supplies estimate in £.

How much primer do I need? Free calculator for new plasterboard, timber & repaints — adjusts coverage by surface type.

How many deck boards do I need? Free calculator for treated, cedar & composite boards — gives board count, linear metres, and waste factor.

Deck footing calculator: How many concrete piers for my deck? Free tool — gives footing count, post layout, and beam spacing.

How many railing posts and balusters do I need? Free deck railing calculator — gives post count, baluster total, and rail linear metres.

Deck stair calculator: How many steps and stringers? Free tool — enter deck height for step count, stringer quantity, and tread boards.