Construction guides
Short, practical explanations for the measurements and assumptions behind our calculators. Each guide shows the math, a worked example, and where a supplier or local authority should take over.
How to Calculate Concrete for a Slab
A transparent slab takeoff: measure depth, convert units, add waste, and order in the units your supplier uses.
Read the guide →GuideChoosing a Concrete Waste Factor
How to choose an explicit concrete allowance without hiding measurement error in a rounded order.
Read the guide →GuideGravel Depth and Compaction
Plan gravel for a driveway, path, or base by separating finished depth, volume, density, and compaction allowance.
Read the guide →GuideEstimating Paint for a Room
Measure wall area, subtract openings, choose coats and manufacturer coverage, then round to whole containers.
Read the guide →GuideUnderstanding Board Feet
Learn the board-foot volume convention, nominal versus actual dimensions, and how to compare a lumber quote.
Read the guide →GuideRoof Pitch and Rafter Measurements
Relate rise, run, slope, angle, overhang, and rafter geometry without confusing a planning estimate with structural design.
Read the guide →GuideHow to Measure Stairs
Measure finished rise, choose a target riser and tread, and compare the resulting run before checking local requirements.
Read the guide →GuideMeasuring Square Footage Accurately
Sketch rooms and irregular spaces as non-overlapping rectangles, convert units once, and apply material waste only at the end.
Read the guide →