Foundation Calculators
Calculate materials for concrete foundation work including anchor bolts, sill seal, and pressure treated plates.
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.
How much gravel do I need? Free calculator for any area — cubic metres, tonnes, and cost estimate with 10% wastage factor.
Driveway gravel calculator: Estimate tonnes and cost by type — crushed stone, pea gravel, MOT Type 1, or decomposed granite with delivery.
Block fill calculator — how much concrete to fill concrete blocks? Free tool for 100 mm, 140 mm & 215 mm blocks. Get cubic metres and bag count instantly.
Mortar mix calculator — free tool to estimate bags of mortar for blockwork, brickwork & stone. Covers designations M2, M4 & M6 with joint thickness options.
Retaining wall calculator — free tool for block, masonry & stone walls. Get block count, coping stones, gravel backfill & drainage estimates instantly.
How much reinforcement bar do I need? Free calculator for slabs, footings & walls — gives bar count, linear metres, weight in kg, and 6 m bar total.
Reinforcement spacing calculator — free tool to find optimal grid layout by load type. Get bar count, linear metres, and chair supports for any slab.