A pack may contain several boards and cover a non-round area. Enter the labelled area per pack, not the area of one plank, in a pack calculator. Keep the measurement unit visible on the note you take to the supplier. A worked example Item Example or check Room area 23 m² Chosen allowance 8% Target […]
Use the coverage printed on the box when the purchase unit is a box. Individual tile dimensions can help cross-check the label, but the pack coverage gives a direct route from area to the number of boxes you can order. A worked example Item Example or check Net floor 18 m² Chosen extra 10% Target […]
Allowance and purchase rounding solve different problems. Allowance changes the target quantity to account for losses you choose to plan for. Rounding turns that target into the whole packs, tins or other units a supplier sells. A worked example Item Example or check Net area 20 m² Extra allowance 10% = 2 m² Target area […]
Length conversion factors must be cubed when converting volume. One yard is three feet, so one cubic yard contains 27 cubic feet. Treating it as three cubic feet produces a ninefold error. A worked example Item Example or check 1 ft 0.3048 m 1 ft³ 0.028316846592 m³ 1 yd³ 0.764554857984 m³ 2 m³ About 2.6159 […]
A bag’s mass tells you how much material you carry. Yield tells you how much mixed concrete it produces. They are different quantities. A reliable bag count starts with the finished volume and the yield printed on the exact product. A worked example Item Example or check Required mixed volume 0.3 m³ Illustrative product yield […]
Convert all three dimensions to one length unit before multiplying. Diagram is not to scale. Measure the planned pour, not the space around it. Record length, width and thickness separately, with a unit beside every number. Thickness is often measured in millimetres or inches while the other dimensions are in metres or feet. Convert those […]