BuildFactor Guides
Guides
Practical guides for construction calculations, material estimating, measurements and field work — each one links straight to the BuildFactor calculator that does the math.
Featured Guides
How to Calculate Concrete Volume for a Slab
Concrete volume for a slab is length × width × depth, converted to a single unit. Here's the formula, the unit traps, and a worked example.
How Much Concrete Do I Need? Complete Guide
A complete walkthrough for sizing a concrete order — volume, waste allowance, and the difference between the exact figure and what you actually call in.
How to Calculate Roof Area From Roof Dimensions
Roof area isn't the same as the building's footprint — the slope factor from the pitch stretches a flat area into the real sloped surface.
How to Calculate Tile and Flooring Quantity
Tile and flooring quantity starts with room area, then adds a cut-waste allowance that depends heavily on the layout pattern you choose.