250+ free calculators for trades, home and everyday life
Estimate the number of bricks or blocks needed for any wall, including a waste allowance.
Estimate only. Always get 2–3 quotes from local trades before committing.
Enter the wall dimensions and the size of one brick or block (face dimensions plus mortar joint). The calculator divides wall area by single-unit area. Add ~10% waste for cuts and breakage.
The pricing framework used by profitable contractors — from take-off to contingency — explained in plain language.
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Work out concrete volume in m³ or yd³ plus how many bags you need for any slab, footing or column.
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Convert roof pitch between rise/run, degrees and ratio. Get rafter length from span.
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Calculate the weight of reinforcing steel bar from diameter and length.
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Estimate the cost of laying a new floor in a loft conversion — chipboard, laminate or engineered oak — with materials, labour, joists and insulation.
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Cubic metres (or yards) of ready-mix concrete for a slab or foundation, including a waste factor.
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Turn materials, labour hours and target margin into a defensible bid price with burdened labour cost.
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Embodied CO₂e of a build from the mass of common structural and finishing materials (ICE database cradle-to-gate factors).
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Maximum lateral pressure on wall or column formwork from the ACI 347 / CIRIA 108 method, based on pour rate, concrete temperature and mix type.
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Number of risers, tread depth, stair angle and total run for a stair that fits your floor-to-floor height, checked against UK Part K / IRC codes.
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MOT Type 1 / crushed stone, sharp sand and geotextile quantities for a patio, driveway, path or shed base — plus compacted vs loose volume conversion.
