Building & roofing
Building & roofing calculators
Building work needs counts you can order from a yard: bricks or blocks and the cement and sand for the mortar, roof shingles or tiles from the pitch, siding boxes, gutter sections, lumber in board feet and rebar by the bar. These calculators work them out from the sizes on your drawing.
The stair calculator checks your risers and treads against US, UK, European, Australian, Indian and Pakistani rules. For anything that carries a load — beams, roof slabs, foundations — always follow your engineer or local building control.
Pick a calculator
- House construction cost calculator (Pakistan)Grey structure or complete house cost per sq ft for a marla or kanal plot, with cement, steel, bricks, sand and crush.
- Brick & block calculatorBricks or blocks for a wall, and the mortar as cement bags and sand.
- Roofing calculatorRoof area from pitch, squares and shingle bundles — or roof tiles and slates.
- Roof pitch calculatorRoof pitch as X in 12, degrees and percent, plus the rafter length with overhang.
- Siding calculatorSiding or cladding area, squares and boxes or boards, with gable ends and openings.
- Gutter calculatorGutter sections, downspouts, hangers and fittings for your roof edges.
- Board foot calculatorBoard feet, cubic feet or m³ and the cost of lumber or timber, from the size and number of pieces.
- Rebar calculatorBars to buy, total length and weight of rebar for a slab grid, with laps and stock lengths.
- Stair calculatorRisers, treads and angle, checked against US, UK, European, Australian, Indian and Pakistani rules.
Which calculator do I need?
- How many bricks or blocks, and how much mortar?Brick & block calculator
- How many roofing squares, shingle bundles or roof tiles?Roofing calculator
- What is my roof pitch in degrees, and how long are the rafters?Roof pitch calculator
- How much siding or cladding for the walls?Siding calculator
- How many gutter sections and downspouts?Gutter calculator
- How many board feet of lumber, and what will it cost?Board foot calculator
- How many rebar bars for a slab, and how heavy?Rebar calculator
- How many steps, and is my staircase within the rules?Stair calculator
- What will it cost to build a house, grey structure or complete?House construction cost calculator (Pakistan)