Free UK Construction Calculators
Work out exactly what to buy, then see every sheet, cut and offcut before you pick up a saw.
Standard UK sizes throughout: 2400 × 1200 mm sheets, 25 kg bags, 2.5 L and 5 L tins. No signup, nothing to install.
Example: a 4.5 m wall with a window, boarded in 2400 × 1200 plasterboard
Calculators
45 free UK construction calculators, in six groups
Laminate Flooring Calculator
Packs of laminate with an expansion gap, staggered end joints, a plank-by-plank cutting plan and shared offcuts.
Use Calculator →Vinyl Flooring Calculator
Sheet vinyl roll width, direction and length to order, with the fewest seams and the trimming allowance and pattern repeat added.
Use Calculator →Hardboard Calculator
3mm hardboard laid across the floorboards with staggered joints, offcuts reused, and the nails counted.
Use Calculator →Scotia Beading Calculator
Scotia round the room, stopped at the doors and cut from 2.4m or 2.7m lengths with offcuts reused, with packs and nails counted.
Use Calculator →Screed Calculator
Floor screed volume, weight and bags for any room size and depth.
Use Calculator →Loft Boarding Calculator
Boards laid across your joists with staggered joints, loft legs placed where boards meet joists, and a loft hatch check.
Use Calculator →Plasterboard Calculator
Calculate sheets needed with visual waste diagram. UK standard sizes: 2400x1200mm.
Use Calculator →Plasterboard Ceiling Calculator
Calculate ceiling plasterboard sheets with screw and nogging counts.
Use Calculator →Plaster Calculator
Bags of skim plaster needed for any wall or ceiling. Multi-Finish, Board Finish, Bonding Coat and One Coat.
Use Calculator →Stud Wall Calculator
Studs, door frames, noggins and plates laid out against plasterboard joints, with a cutting plan that reuses offcuts.
Use Calculator →Paint Calculator
Paint needed in UK tin sizes (2.5L/5L) with multiple coats.
Use Calculator →Wallpaper Calculator
Rolls needed with pattern repeat for any room.
Use Calculator →Coving Calculator
Lengths, mitre cuts and adhesive for any room, with offcut reuse and a visual layout diagram.
Use Calculator →Skirting Board & Architrave Calculator
Per-wall cutting list with doors, joins and offcut reuse, the board length that wastes least, and architrave sets.
Use Calculator →Dado Rail Calculator
Dado and picture rail round a room, with doors and windows breaking the rail only where they reach its height.
Use Calculator →Wall Panelling Calculator
Shaker frames or board and batten with even spacing, a strip cutting list that reuses offcuts, and an elevation to scale.
Use Calculator →Slat Wall Panel Calculator
600mm acoustic slat panels laid wall by wall, the last one cut to width, offcuts shared, with packs and adhesive counted.
Use Calculator →Window Board Calculator
Each window board sized with its horns and overhang, then cut from the mix of 2100 and 3660mm lengths that buys least.
Use Calculator →Alcove Shelving Calculator
Builds a timber frame under each shelf the way Wickes' guide does, lays the MDF tops out on the sheet, and cuts every piece from 2.4m or 1.8m lengths.
Use Calculator →Kitchen Worktop Calculator
Which run goes through each corner, joints clear of the sink and hob, and every piece cut from 3m or 4.1m boards.
Use Calculator →Kitchen Plinth Calculator
Every plinth run and return cut from 2400, 2600 or 3000mm lengths, offcuts reused, with clips and corner clips counted.
Use Calculator →Kitchen Cornice Calculator
Adds returns and mitres at the open ends, shares offcuts between cornice and pelmet, and cuts every piece from 2400 or 2600mm lengths.
Use Calculator →Shower Panel Calculator
Hydrolock wall panels laid wall by wall with the joint allowance, leftovers shared between walls, and the trims counted.
Use Calculator →Tile Backer Board Calculator
NoMorePly boards on stud walls with every joint on a stud, or on floors, with offcuts reused and screws and noggins counted.
Use Calculator →Tile Trim Calculator
Every trimmed tile edge allocated to 2.5m or 2.44m strips longest first, with mitred corners allowed for and a cutting chart.
Use Calculator →Fence Calculator
Panels, posts and postcrete bags for any fence length.
Use Calculator →Close Board Fence Calculator
Featheredge boards, arris rails, posts and postcrete, with boards per metre derived from your own board width and overlap.
Use Calculator →Patio Calculator
The whole patio job: excavation, sub-base, bedding, slabs, jointing and edging.
Use Calculator →Paving Slab Calculator
Slabs by size, cuts and offcut reuse, bedding and jointing by laying pattern.
Use Calculator →Block Paving Calculator
Herringbone or stretcher bond laid over your area and clipped to the edges, with whole and cut blocks counted and packs to order.
Use Calculator →Sub-Base Calculator
MOT Type 1, Type 3, crusher run or hardcore depth, volume, tonnage and muck away spoil.
Use Calculator →Gravel Calculator
Gravel volume and weight for paths, driveways and gardens.
Use Calculator →Topsoil Calculator
Volume, weight and bulk bags for lawns, borders and raised beds.
Use Calculator →Turf Calculator
Rolls of turf laid in staggered rows with reused offcuts, plus the topsoil underneath and a one-click handoff.
Use Calculator →Artificial Grass Calculator
Strips with trim and seam overlaps packed onto 2m, 4m or 5m rolls, with tape, pins and sand counted.
Use Calculator →Decking Calculator
Boards, joists, noggins, fascia and screws with layout diagram for decks.
Use Calculator →Sleeper Raised Bed Calculator
Sleepers, cutting list with overlapping corners and staggered joints, fixings, liner and soil volume for a raised bed or edging.
Use Calculator →Coping Stone Calculator
Lays 600mm coping along each run of wall with 10mm joints, reuses the offcuts from cut stones, and checks the overhang.
Use Calculator →Shed Base Calculator
Concrete, paving slabs or a timber bearer frame for any shed size, with a visual base diagram.
Use Calculator →Shed Roof Felt Calculator
Felt strips with overhangs, laps and a ridge strip packed onto 8m or 10m rolls, with nails and adhesive length counted.
Use Calculator →Cladding Calculator
Shiplap courses laid round windows and doors with staggered joints, reused offcuts and the battens behind.
Use Calculator →Brick & Block Calculator
Bricks or blocks needed by bond type, with mortar, cement, sand and wall ties.
Use Calculator →Mortar Calculator
Cement bags and sand volume for bricklaying and repointing.
Use Calculator →Render Calculator
Bags of render needed for exterior walls. Sand and cement, monocouche and pebbledash systems.
Use Calculator →Concrete Calculator
Calculate concrete for slabs, footings and post holes: postmix bags, bagged concrete mix, ballast and cement to mix your own, or m3 of delivered concrete, with the crossover point explained.
Use Calculator →Why CalcTools.uk?
UK Standard Sizes
Every calculator uses UK material sizes: 215x102.5x65mm bricks, 2400x1200mm plasterboard, 25kg cement bags, 2.5L/5L paint tins. No converting from American sizes.
Visual Waste Diagrams
See exactly where every sheet, tile and board goes. Green for full pieces, amber for cuts, red for waste. Know what you're buying before you buy it.
Real Cutting Patterns
Not just "area divided by material size plus 10%". We calculate actual sheet layouts, optimal orientation, reusable offcuts and true waste.
100% Free, No Signup
All calculations run in your browser. No accounts, no limits, no data stored on servers. Bookmark it and use it on site.
How Our Waste Diagrams Work
Every material calculator shows a visual cutting layout
Full Pieces
Uncut materials used whole: zero waste
Cut Pieces
Materials that need cutting to fit: dimensions labelled
Waste Offcuts
Material you can't reuse: shows you exactly what's wasted
Calculate it. Build it.
Stop guessing. Know exactly what you need before you go to the merchant.