250+ free calculators for trades, home and everyday life
Concrete, brickwork, roofing, framing, loft floors and material take-offs with full cost estimates.
Work out concrete volume in m³ or yd³ plus how many bags you need for any slab, footing or column.
Estimate only. Always get 2–3 quotes from local trades before committing.
Volume = Length × Width × Depth × (1 + waste%)
Estimate the number of bricks or blocks needed for any wall, including a waste allowance.
Estimate only. Always get 2–3 quotes from local trades before committing.
Convert roof pitch between rise/run, degrees and ratio. Get rafter length from span.
Angle = arctan(rise / run); Rafter = √(rise² + run²)
Calculate the weight of reinforcing steel bar from diameter and length.
Weight = (π/4 × d² × L × ρ) × N, ρ = 7850 kg/m³
Estimate the cost of laying a new floor in a loft conversion — chipboard, laminate or engineered oak — with materials, labour, joists and insulation.
Estimate only. Always get 2–3 quotes from local trades before committing.
Total = area × (material/m² + labour/m²) + optional insulation + optional new joists
Cubic metres (or yards) of ready-mix concrete for a slab or foundation, including a waste factor.
Turn materials, labour hours and target margin into a defensible bid price with burdened labour cost.
Embodied CO₂e of a build from the mass of common structural and finishing materials (ICE database cradle-to-gate factors).
Maximum lateral pressure on wall or column formwork from the ACI 347 / CIRIA 108 method, based on pour rate, concrete temperature and mix type.
Number of risers, tread depth, stair angle and total run for a stair that fits your floor-to-floor height, checked against UK Part K / IRC codes.
MOT Type 1 / crushed stone, sharp sand and geotextile quantities for a patio, driveway, path or shed base — plus compacted vs loose volume conversion.
Guided room survey
Measure a room, detect windows and doors from wall photos, preview proportions in 3D, and price flooring, paint, plasterboard and metal-stud materials.
Enter one confirmed measurement before analysing a wall photo.
Stand square to the wall, include its full edges, and avoid wide-angle zoom.
Camera suggestions remain editable. Confirm dimensions before ordering.
Cost breakdown
Selected estimate
€2,063
Working budget range
Includes 10% material waste and a ±15% allowance for supplier, site and regional variation.
€1,754–€2,373
Includes two paint coats at 10 m²/L, 1200 × 2400 mm boards, 600 mm stud spacing, head and floor tracks, opening supports, noggins, framing screws, drywall screws, joint compound, flooring and indicative labour. Excludes delivery, demolition, insulation, electrical or plumbing changes, cabinets, trims, structural design and local tax differences. Camera detection is an estimating aid, not a certified survey.