Free trade calculators that match the app

How many concrete blocks a wall needs by block type and thickness, plus the cement, lime and sand for the mortar, wall ties and pallets.

How many bricks, blocks, bags of cement, lime and sand you need for a wall, with the right mortar designation, wastage, openings and packs.

A full materials take-off for a single or double storey extension from its footprint: concrete by designation, Type 1, bricks, blocks, mortar, ties, trays, insulation, roof deck and plasterboard.

How many deck boards, joists, bearers, posts, bags of postcrete and boxes of screws a garden deck needs, from the real deck size and board length.

How many lengths of skirting and architrave a room needs, with the fixings, adhesive and caulk, plus the studs, plates, plasterboard and insulation for a stud wall.

How many 3 m lengths, clips, fittings, inserts, solder and lagging a run needs, and whether the bore will carry the outlets on it without running too fast.

How many watts and BTU a room needs on a −3 °C day, and which catalogue rad (K1, K2 or K3) covers it at your flow temperature.

A guide cable size for a ring, radial, lighting, cooker, shower, immersion or EV circuit from BS 7671 Table 4D5, with the installation method, grouping and ambient corrections, the voltage drop and how much cable to buy.

How many 25kg bags of plaster or render a room or wall needs, from British Gypsum coverage rates, plus primer, beads, scrim, dot-and-dab adhesive and water.

How many roof tiles or slates a pitched roof needs by named tile and pitch, plus the battens, underlay rolls, ridge and hip tiles, valleys, verge and the fixings BS 5534 asks for.

How many litres and tins of emulsion, ceiling paint, woodwork paint or masonry paint a room needs by grade, coats and coverage, with the mist coat, undercoat and prep.

How many tiles, boxes, bags of adhesive and grout an area needs by tile size, joint width, layout and where it is going, from the BAL, Weber and Mapei datasheets.

How many standards, ledgers, transoms, boards, couplers, braces and ties an independent tube and fitting scaffold needs to TG20, for a given length, height, lifts and load class.

How many paving slabs a patio needs by slab size and joint, plus the MOT Type 1, sharp sand, cement, priming slurry and jointing compound to lay them, the fall and the dig.

How many rolls of turf or kilos of seed a lawn needs, the topsoil under it in tonnes and bulk bags, or the bags of topsoil, MOT Type 1, gravel or bark for any area.

How many cubic metres of concrete a slab, strip footing or post holes need, as ready-mix wagons, bags of cement and ballast or pre-mixed bags, with the BS 8500 designation, mesh and shuttering.

How much soil you will dig out, what it weighs, how many skips or grab loads once it bulks up, and the tonnes of MOT Type 1, blinding and DPM to fill the hole back.

The heating load of a house in kW from its size, walls and windows, and the combi size its hot water needs, with the mains flow check and the catalogue band to look at.

How many fence panels or featheredge boards, posts, rails, gravel boards and bags of postcrete a run needs, with timber or concrete posts, gates and corners.

Turn the base, wall and tall runs of a kitchen into worktop boards and joints, plinth, cornice and pelmet with returns, end panels, doors, hinges and the fixings that never make the plan.

Tiles by size and joint, adhesive split wall and floor, grout by the formula, tanking kits for the wet zone to BS 5385, backer boards on the wet walls and a tile-weight check against the substrate.

How many paving blocks a driveway or patio needs by block size and pattern, with the Type 1 (or Type 3 for permeable), sharp sand, kiln-dried sand, edging, haunching concrete, drainage channel and the dig-out.

Build the unit from its panes and spacers (4-20-4 by default), get the size to order from the rebate, its weight per pane and per unit, whether Part K needs safety glass, and how many people it takes to lift.

How many sheets of plasterboard a wall, partition or ceiling needs by board size, with the screws, joint tape, Easi-Fill and metal or timber studs to go with them.

Frame size to order from the brick-to-brick opening, cills with horns cut from 3 m or 6 m lengths, fixings from the frame dimensions, foam by yield, trims, silicone and trickle vents per room to Part F.