How to Calculate Square Metres for Building Work
Measure rectangles, L-shaped rooms, walls and openings accurately before using any material calculator.
Read guide →Building quantity & measuring guides
The calculators give you the number. These guides explain the measurement, assumptions and checks behind it.
Masonry & ConcreteWalls & PlasteringFloors & DecoratingRoofingTimber & CarpentryLandscapingGroundworksMeasuring & Conversions
How to Calculate Cubic Metres (m³) on Site
A practical guide to turning length, width and depth into concrete, excavation and aggregate volumes.
Read guide →Waste Allowances: When to Add 5%, 10% or More
Why cuts, breakage, layout and site variation matter — and why one waste percentage does not suit every material.
Read guide →How to Measure Walls, Doors and Windows for Material Estimates
A repeatable way to calculate gross wall area, deduct openings and avoid double-counting.
Read guide →How to Estimate Brick Quantities for a Wall
From net wall area to bricks-per-square-metre rates, openings, waste and ordering checks.
Read guide →How to Estimate Concrete for a Slab or Footing
Calculate geometric volume, convert millimetres correctly and decide what ordering allowance to use.
Read guide →How to Estimate Mortar for Brickwork
Why mortar consumption varies and how to use an adjustable rate without pretending one figure fits every wall.
Read guide →How to Work Out How Many Plasterboard Sheets You Need
Board area, openings, orientation, offcuts and why sheet count is not just square metres divided by 2.88.
Read guide →How to Calculate Paint Quantity for Walls and Ceilings
Measure paintable area, account for coats and use the actual product coverage rather than a generic litres figure.
Read guide →How to Calculate Tiles, Adhesive and Grout
A step-by-step ordering workflow for tile count, cutting allowance and product coverage.
Read guide →How to Estimate Roof Covering Quantities
Measure sloping roof area, use manufacturer tile rates and separate field tiles from linear components.
Read guide →How Roof Pitch Changes Roof Area
Why plan area underestimates a pitched roof and how slope length changes as pitch increases.
Read guide →How to Estimate Decking Boards and Joists
Separate surface-board quantities from frame quantities and plan around stock lengths and cutting waste.
Read guide →How to Estimate Fence Panels, Posts and Post Mix
Count bays, end posts, gate posts and concrete separately for a cleaner fence material list.
Read guide →Patio Material Quantities: Slabs, Sub-Base and Bedding
Build a quantity checklist layer by layer rather than calculating paving slabs alone.
Read guide →Ordering Aggregate: m³, Tonnes and Bags Explained
Understand why cubic metres and tonnes are not interchangeable without a density conversion.
Read guide →Excavation and Spoil: In-Situ vs Loose Volume
Why dug material can occupy more space and how to plan haulage or skips without underestimating volume.
Read guide →Builder’s Measurement Checklist Before Ordering Materials
A short pre-order check to catch unit mistakes, missing openings, duplicate areas and unrealistic waste assumptions.
Read guide →