Pick whichever tool fits what you're working on. All calculators are free, use 2026 UK prices, and work on any device.
Building & Structure
Roofing Calculator
Work out how many roof tiles, slates or felt rolls you need. Includes 2026 UK material cost estimates.
Calculate now โConcrete Bag Calculator
Find out how many bags of concrete you need for slabs, patios, and fence post holes. Supports 20kg and 25kg bags.
Calculate now โBrick Cost Calculator
Calculate how many bricks and mortar bags you need for a wall, plus a full cost estimate.
Calculate now โRendering Cost Calculator
Estimate wall rendering costs for sand/cement, monocouche or silicone render. Materials and 2026 labour rates.
Calculate now โTile Calculator
How many tiles, grout and adhesive for walls, floors and showers. UK sizes, 2026 prices.
Calculate now โGarden & Outdoor
Decking Calculator
Calculate how many decking boards, joists and fixings you need for any size deck. Includes UK timber prices.
Calculate now โFence Calculator
Work out how many fence panels, posts and gravel boards you need. Covers standard UK garden fence sizes.
Calculate now โHeating & Energy
Radiator BTU Calculator
Find the right radiator size for any room. Enter your dimensions and insulation level for an accurate BTU recommendation.
Calculate now โHeat Pump Grant Calculator
Check your eligibility for the ยฃ7,500 Boiler Upgrade Scheme grant and estimate your heat pump running costs.
Calculate now โGarden & Outdoor Calculators
Planning a garden project? Our sister site GardenCalc.uk has free calculators for grass seed, soil, mulch, compost, lawn feed, fertiliser and more.
Browse garden calculators โ