Free UK Construction Calculators
Calculate exactly how many materials you need for any project. Visual waste diagrams show cutting layouts. Standard UK sizes. No signup, no cost.
Built for tradespeople and DIY enthusiasts across the UK
Calculators
Free UK construction calculators, more coming soon
Plasterboard Calculator
Calculate sheets needed with visual waste diagram. UK standard sizes: 2400x1200mm.
Use Calculator → Building MaterialsPlasterboard Ceiling Calculator
Calculate ceiling plasterboard sheets with screw and nogging counts.
Use Calculator → Building MaterialsPlaster Calculator
Bags of skim plaster needed for any wall or ceiling. Multi-Finish, Board Finish, Bonding Coat and One Coat.
Use Calculator → Building MaterialsRender Calculator
Bags of render needed for exterior walls. Sand and cement, monocouche and pebbledash systems.
Use Calculator → Building MaterialsBrick & Block Calculator
Bricks or blocks needed by bond type, with mortar, cement, sand and wall ties.
Use Calculator → Building MaterialsMortar Calculator
Cement bags and sand volume for bricklaying and repointing.
Use Calculator → Building MaterialsScreed Calculator
Floor screed volume, weight and bags for any room size and depth.
Use Calculator → LandscapingFence Calculator
Panels, posts and postcrete bags for any fence length.
Use Calculator → LandscapingClose Board Fence Calculator
Featheredge boards, arris rails, posts and postcrete, with boards per metre derived from your own board width and overlap.
Use Calculator → LandscapingPatio Calculator
The whole patio job: excavation, sub-base, bedding, slabs, jointing and edging.
Use Calculator → LandscapingSub-Base Calculator
MOT Type 1, Type 3, crusher run or hardcore depth, volume, tonnage and muck away spoil.
Use Calculator → LandscapingPaving Slab Calculator
Slabs by size, cuts and offcut reuse, bedding and jointing by laying pattern.
Use Calculator → StructureShed Base Calculator
Concrete, paving slabs or a timber bearer frame for any shed size, with a visual base diagram.
Use Calculator → LandscapingGravel Calculator
Gravel volume and weight for paths, driveways and gardens.
Use Calculator → LandscapingTopsoil Calculator
Volume, weight and bulk bags for lawns, borders and raised beds.
Use Calculator → LandscapingDecking Calculator
Boards, joists, noggins, fascia and screws with layout diagram for decks.
Use Calculator → InteriorWallpaper Calculator
Rolls needed with pattern repeat for any room.
Use Calculator → InteriorPaint Calculator
Paint needed in UK tin sizes (2.5L/5L) with multiple coats.
Use Calculator → InteriorCoving Calculator
Lengths, mitre cuts and adhesive for any room, with offcut reuse and a visual layout diagram.
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.