Calculators. 808 free tools for the sums trades do every day.
94 calculatorsElectricalOhm’s law, power, cables, AC, motors, lighting and testing.87 calculatorsHigh-voltageFault levels, HV cables, lines, earthing, arc flash and protection.68 calculatorsGas and plumbingGas rates, heat input, hot water, radiators, hydraulics and drainage.84 calculatorsHVAC and refrigerationSuperheat and subcooling for 22 refrigerants, fault diagnosis, airflow, heat loads and ducts.32 calculatorsRenewablesHeat pumps, solar PV, batteries, solar thermal and EV-ready energy maths.42 calculatorsBricklayingBricks and blocks, mortar, setting out, arches and site maths.61 calculatorsCarpentryTimber, sheets, joinery, roofs, stairs and fixings.33 calculatorsRoofingPitched and flat roofs, tiles, slates, battens, membranes, lead, gutters and pricing.52 calculatorsTilingTile quantities, setting out, adhesive, grout, screeds, falls and movement joints.53 calculatorsPlasteringPlaster, render, plasterboard, drying, dew point and U-values.37 calculatorsPainting and decoratingPaint, primer, wallpaper, filler, coverage, drying and pricing.31 calculatorsInsulation and retrofitU-values, insulation thickness, condensation risk, airtightness and retrofit savings.38 calculatorsConcrete and groundworksConcrete volumes, mixes, rebar, excavation, sub-base, drainage and site maths.28 calculatorsScaffolding and liftingScaffold quantities, loads, ties, sling angles, rigging and ground bearing.31 calculatorsSteelworkSteel fixing, bending schedules, laps, structural steel erection, bolting and lifting weights.37 calculatorsWelding and fabricationWeld sizes, heat input, consumables, steel weights, sections, bending and cutting.
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Results are arithmetic from the formula shown. They do not replace manufacturer instructions, regulations, design calculations or inspection and testing by a competent person.