Get the numbers right
Home and property
Plan quantities and dimensions from your measurements.
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- Acreage calculatorConvert a rectangular plot’s dimensions in feet to acres: acres = length × width ÷ 43,560.
- Aquarium tank weight calculatorAdd water mass to the tank, substrate and equipment for a filled-system estimate.
- Baluster calculatorFit equal-width balusters with equal gaps at both ends: n = ceiling((span − maximum gap)/(width + maximum gap)).
- Battery life calculatorRun time = usable stored energy × delivery efficiency ÷ constant load power.
- Block mortar calculatorEstimate mortar in a uniform masonry grid from wall area, unit size, wall thickness and joint thickness.
- Board and batten layout calculatorLay out equal wall panels with a full batten at each edge and between every panel.
- Board foot calculatorOne board foot is a 12 × 12 × 1 inch volume. Board feet = thickness in inches × width in inches × length in feet × count ÷ 12.
- Brick calculatorEstimate bricks for a wall face using nominal brick-plus-joint modules, then apply your waste allowance.
- Cabinet door calculatorSize one cabinet door or a pair from the opening, overlay or inset, and meeting gap.
- Concrete block fill calculatorCalculate fill volume from block count and the measured empty core dimensions.
- Concrete calculatorRectangular concrete volume = length × width × depth. Apply your allowance, then divide by bag yield and round up if buying bags.
- Concrete mix calculatorAllocate a specified dry-material volume among cement, fine aggregate and coarse aggregate by your chosen volume ratio.
- Concrete reinforcing mesh calculatorCount mesh sheets in an aligned rectangular grid, allowing your stated overlap between adjacent sheets.
- Concrete steps calculatorCalculate a solid stack of rectangular concrete steps: volume = width × rise × tread × n(n + 1)/2.
- Deck flooring calculatorLay deck boards across a width with a stated gap and count stock lengths along the deck.
- Drywall calculatorDrywall sheets = wall and ceiling area × (1 + allowance ÷ 100) ÷ sheet area, rounded up.
- Fence calculatorSections = run length ÷ maximum section length, rounded up. A single open straight run needs one more post than sections.
- Fertilizer calculatorProduct required = treated area × label application amount ÷ label reference area.
- Flooring calculatorPacks = floor area × (1 + allowance ÷ 100) ÷ coverage per pack, rounded up.
- Framing calculatorCount regular stud positions across a straight wall with an end stud at each end.
- Gravel calculatorLoose material volume = area × depth × (1 + allowance ÷ 100). Estimated mass = volume × supplied bulk density.
- Lawn mowing calculatorEstimate mowing time from area, effective swath, travel speed and your allowance for turns and obstacles.
- Lumber weight calculatorFind timber mass from volume and the density you supply.
- Metal roofing material calculatorCount metal panels using effective cover width and any end overlap along the slope.
- Metal weight calculatorCalculate metal mass from net solid volume and the specified alloy density.
- Paint calculatorPaint needed = paintable area × coats ÷ stated coverage per container, plus your extra allowance. Round up to whole containers.
- Plant and flower calculatorCount plant positions on a rectangular grid using your chosen center spacing and edge margins.
- Plywood calculatorCompare two uniform sheet orientations for covering a rectangular surface.
- Pool volume calculatorFind volume for a rectangular pool with a floor sloping uniformly from one end to the other.
- Post hole concrete calculatorConcrete around a square post = (π × hole radius² − post width²) × filled depth.
- Rafter length calculatorFind the sloping rafter line from rise, horizontal run and overhang: length = (run + overhang) × √(1 + (rise/run)²).
- Rebar material calculatorCount straight bars in two directions with edge bars and a maximum spacing.
- Rebar weight calculatorMultiply total reinforcing-bar length by the supplier’s mass per metre.
- Retaining wall calculatorCount block courses and pieces for a straight, level, rectangular retaining-wall face.
- Roof pitch calculatorPitch as rise per 12 run = rise ÷ horizontal run × 12. Angle = arctan(rise ÷ run).
- Roofing calculatorConvert horizontal roof projection area to sloping area using √(rise² + run²)/run.
