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 →Concrete 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 →Brick Cost Calculator
Calculate how many bricks and mortar bags you need for a wall, plus a full cost estimate.
Calculate now →Rendering Cost Calculator
Estimate wall rendering costs for sand/cement, monocouche or silicone render. Materials and 2026 labour rates.
Calculate now →Tile Calculator
How many tiles, grout and adhesive for walls, floors and showers. UK sizes, 2026 prices.
Calculate now →Garden & Outdoor
Decking Calculator
Calculate how many decking boards, joists and fixings you need for any size deck. Includes UK timber prices.
Calculate now →Fence Calculator
Work out how many fence panels, posts and gravel boards you need. Covers standard UK garden fence sizes.
Calculate now →Heating & 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 →Heat Pump Grant Calculator
Check your eligibility for the £7,500 Boiler Upgrade Scheme grant and estimate your heat pump running costs.
Calculate now →Garden & 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 →