Calculators
Free, no-nonsense calculators for common building and trade jobs. No sign-up, no ads in the way — just the numbers you need.
Concrete Calculator
Work out how much concrete you need for a slab, footing or fence post holes, in cubic metres and bags.
Radiator BTU Calculator
Work out the radiator output a room needs, based on its size, insulation, glazing and exposure.
Paint Coverage Calculator
Work out how many litres of paint and how many tins you need for a room, based on area and coats.
Tile Calculator
Work out how many tiles, how much adhesive and how much grout you need, based on your area and tile size.
Skip Size Calculator
Find the smallest standard UK skip size that fits your job, estimated by bin bags or room size.
Loft Insulation Calculator
Work out how many packs of insulation you need to top up a loft to the recommended depth.
Decking Calculator
Work out how many deck boards, joists and screws you need, based on your deck size and board dimensions.
Guttering Calculator
Work out gutter lengths, downpipes and fittings needed, based on your run length and roof area.
Fence Panel Calculator
Work out how many fence panels, posts and gravel boards a run of fencing needs.
Plasterboard Calculator
Work out how many plasterboard sheets and fixing screws a wall or ceiling needs.
Roofing Felt Calculator
Work out how many rolls of shed roofing felt and how many nails your roof needs.
Artificial Grass Calculator
Work out how much artificial grass, joining tape and turf pins your lawn needs.