GeoffsWoodwork
for Students of Woodwork |
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| Costing
- Imperial - price per cubic foot
Cubic measurement. Historical ~ Commercially this measure is redundant but you may well find some smaller suppliers still using or at least quoting it as a comparison. It was used until recently for most hardwood pricings and probably will still be around for a number of years yet. Indeed many books and magazines you read will undoubtedly be quoting this system so you really should know about it. Cubic measurement is obtained by multiplying together the length (l), width (w), and the thickness. These measurements should be all expressed in the same units i.e. all inches. A Cubic Foot (cu. ft) could comprise of any of the following measurements: length (l) x width (w) x thickness (t) 144 " (inches) x 12 " x 1 " or, 72 " x 12 " x 2 " or, 36 " x 24 " x 2 " etc. If there are any fractions, it is convenient to express them in decimals of an inch i.e. ¼ would be 0.25; and ½ would be 0.5. The formulae expressed above would give you the amount of cubic inches in each board. however, imperial costings are expressed in price per cubic foot. Price per Cubic Foot (cu. ft). To calculate the cubic capacity of any board first of all find the amount of cu. inches as shown above and then divide the cu. inches by 1728. This figure is the amount of cu. inches in a cu. foot i.e. a cube of wood measuring 12 inches x 12 inches x 12 inches or 1 ft x 1 ft x 1 ft. We don't buy wood like this quite obviously, but it is the equivalent of this cube that we use to price one supplier to another so that we can compare like to like when we are costing or preparing a tender. The formulae we need to
remember is : (you must use inches for all dimensions in this example.) To find the cost, simply multiply the cu. ft by the cost quoted in £s per cu. ft. |
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Last uploaded 21st
August 2001 |