BuildCalcs How much concrete do I need?
Calculate concrete volume from area and depth, understand waste allowance, and use worked examples for slabs, paths and bases.
Read guide →BuildCalcs UK
Building & estimating guides
Practical explanations built around the same calculations used by our tools. Each guide shows the arithmetic, assumptions and worked examples rather than hiding them behind a result box.
How many bricks do I need per square metre?
Understand bricks-per-square-metre estimates, openings and waste with transparent worked examples.
Read guide →Plasterboard sizes and coverage explained
Work out plasterboard sheet coverage, wall and ceiling area, openings and practical waste allowance.
Read guide →How much MOT Type 1 do I need?
Calculate MOT Type 1 volume from area and compacted depth with clear reference tables and worked examples.
Read guide →How many paving slabs do I need?
Calculate patio area and theoretical slab counts, then account for cuts, pattern and waste.
Read guide →How much paint do I need?
Estimate paint litres from wall area, coats and stated product coverage, with worked room examples.
Read guide →How much flooring should I order?
Calculate floor area, understand waste allowances and convert area into pack quantities.
Read guide →Roof pitch explained
Understand roof pitch in degrees, rise/run and the geometric slope factor with a transparent reference table.
Read guide →How many roof tiles or slates do I need?
Calculate true slope area, apply the exact product coverage rate and choose a visible waste allowance.
Read guide →Sand and gravel: from area and depth to volume
Convert area and depth into cubic metres for sand, gravel and aggregate projects without hiding density assumptions.
Read guide →m² and m³ explained for building quantities
Understand square metres, cubic metres and millimetre-to-metre depth conversions for building material estimates.
Read guide →