What is formula to figure ammount of concrete needed ?
2006-11-26 23:30:51 · 3 answers · asked by Anonymous in Home & Garden ➔ Decorating & Remodeling
First of all the term Yards relates to a Cubic measurement, and I'll let you do the math,,, gee.
If you know how many inches are in a yard,,, imagine a BLOCK at those measurements, and divide it into 4 inch slabs 36 inches square, then imagine placing them adjacent to each other and multiplying that by 13.
Keep in mind that it's also a question of volume as determined by a formula achieving the measurement stated. It may be that 13 Yds. will be slightly over,,, or short.
Steven Wolf
2006-11-27 00:00:25 · answer #1 · answered by DIY Doc 7 · 0⤊ 1⤋
1 cubic yard (27 cubic feet), is a cube that is 36 inches per side, or 46656 cubic inches. This means that all three sides are the same. Say that one side is different, and the other two sides are the same (we'll call those 'y') with the one we'll call 'x'. So, we have x*y^2. Doesn't look like much, but if our 'x' is the 4 inches, and we know the total volume is the same then we can work with it. 4y^2 = 46656 cubic inches (volume) ==> y^2 = 11664 square inches (area) ==> y = 108 inches (linear measure) Note the way the dimensions change as we went along. So, apparently if you have a depth of 4 inches, you can cover a square area that is 108 inches (9 feet) per side.....an area of 81 square feet as some others have posted. To check this, take 4" x 108" x 108" I get 46656 (cubic inches), so it checks. :)
2016-03-28 21:32:46 · answer #2 · answered by Erica 4 · 0⤊ 0⤋
it is written on the package/bag that the concrete came in
2006-11-26 23:38:23 · answer #3 · answered by Anonymous · 0⤊ 0⤋