30+ Construction & DIY Tools

All Calculators

30+ free UK construction and DIY calculators. Rebuilt tools are fully featured with 2026 pricing, mobile-optimised layouts and PDF export.

30+ tools available

Always free

Works on any device

Project Estimators

7 tools

Patio Material Estimator

Full shopping list: MOT Type 1, sharp sand bed and slab count for any patio size.

Decking Project Estimator

Complete master list: decking boards, framing joists, posts, postcrete and fixings.

Block Wall Estimator

Blocks, building sand and cement for mortar, and concrete for the trench footing.

Fencing Project Estimator

Panels, feather edge boards, posts and postcrete for your new fence.

Driveway Project Estimator

MOT sub-base, sharp sand bedding and block paver count for driveways.

Shed Base Estimator

MOT sub-base, DPM, timber formwork and complete concrete mix for a professional base.

Lean-To Project Estimator

Full structural estimate for timber carports and shelters: plates, posts, rafters and roofing.

Building

9 tools

Concrete Volume Calculator

Slabs, footings, columns and steps. Ready-mix vs bagged, reinforcement mesh, embodied carbon and adjustable waste.

Muck Away Calculator

Excavation volume, grab lorry loads and skip comparison. 9 soil types, swell factor and 2026 disposal costs.

Skip Hire Calculator

Right skip size for any waste type. 10 waste categories, weight limits, permit costs and cost-optimised selection.

Mortar Mix Calculator

Sand and cement quantities for any mortar mix ratio and wall area.

Brick & Block Calculator

Bricks or blocks required based on wall dimensions and bond pattern.

Roof Tile Calculator

Tiles or slates needed for any roof pitch and area, including ridge and valley.

Floor Screed Calculator

Sand and cement volumes for a level interior floor screed at any depth.

Sand Calculator

Sharp sand, building sand and ballast volumes with cement bag estimates for any mix ratio.

Render Calculator

Sand and cement render quantities for scratch and top coats, moncouche bags, and deductions.

Paving & Groundworks

4 tools

Gravel Tonnage Calculator

Decorative gravel tonnes for driveways and paths at any depth and area.

Sub-Base (MOT Type 1)

Hardcore tonnes with 20% wacker-plate compaction factor built in.

Paving Slab Calculator

Slab count for any patio area, factoring in joint gaps and wastage.

Block Paving Calculator

Block paving count and bags of kiln-dried jointing sand for any area.

Landscaping & Gardens

4 tools

Topsoil & Compost

Soil or compost volume for raised beds, borders and lawn preparation.

Lawn Turf Calculator

Turf rolls for any lawn shape, with 5–10% cutting wastage included.

Mulch & Bark Calculator

Woodchip or bark volume to achieve effective weed suppression depth.

Garden Decking Calculator

Decking board count and linear metres for any garden deck area.

Interiors & Decorating

5 tools

Paint Calculator

Walls, ceiling and woodwork. 8 paint types, interactive wall selector, tin optimiser, mist coat guide and woodwork trim.

Wallpaper Calculator

Roll count accounting for pattern match type and repeat length.

Wall & Floor Tile Calculator

Tile count for any room, factoring in grout joints and cutting waste.

Plaster & Board Calculator

Plasterboard sheets and skim plaster bags for walls and ceilings.

Electrical Cable Size Calculator

Minimum cable cross-section for safe power delivery over any run length.

Energy & Insulation

5 tools

Radiator BTU Calculator

Room heat loss using CIBSE method with radiator sizing and ASHP correction factor.

Loft Insulation Calculator

Rolls needed to reach the recommended 270mm depth to current Building Regs.

Loft Flooring Calculator

Chipboard panels and loft legs needed to board your loft over insulation.

Floor Insulation Calculator

PIR boards or mineral wool for suspended or solid ground floors.

Wall Insulation Calculator

Insulated plasterboard or stud and slab quantities for internal wall lining.