i need to know how too find out how to figure the yards of cement to pour a slab or drive the math of how it

Question

for both three and a half plus four inches in thickness

Answer 1

Jesus Christ, don't any of these idiots know what a cubic yard is? A yard of concrete (cu. yd) is 3'x3'x3'.

To figure out how many cu yds. you need, multiply the length times the width times the height. Then divide by 27. That gives you cu. yds.

In feet, it would look like this if your drive is 12 ft by 30 ft:

12 x 30 = 360 (sq ft) x .291666667 (3.5 divided by 12)= 105 divided by 27 (3 x 3 x 3) = 3.8888889 cu yds.

Or you could call the concrete company and tell them the dimensions and they'll tell you how many yds. They have a slide rule.

I don't know where 'Biker' comes up with 1728 cu. in. One cu yd is 46656 cu. in. (36" x 36" x 36"). 1728 is 12 x 12 x 12 (inches in a cubic foot)

Answer 2

Cement is sold by the cubic yard, being 3 feet by 3 feet by 3 feet making 27 cubic feet. 3 x3 = 9 square feet. 3 feet = 36 inches. so to pore a slab or drive 3 1/2 inches thick, divide 3 1/2 into 36 = 10.285714 rounded off to 10.29, meaning you could pour 10.29 slabs 3 feet by 3 feet by 3 1/2 inches thick. 3 x3 = 9 x 10.29 = 92.61 square feet. If you pour 4 inches thick you get 81 square feet. So measure you slab or drive and find the square feet, then do the math to see how much cement is needed. You wont you slab or drive to last don't forget the rebar, in a drive it should be no less than 3/8 thick and set in a grid 6 inches apart. the grid should be wired together at each intersection and held up off the ground at least 2 inches. I don't know what you are plaining so I can't cover everthing. If it's a large slab or drive get a lot of help it is very hard work. Go to a book store and buy yourself a book on pouring cement or concreat. At the price of cement today you can't afford to F up.

Answer 3

HERE IS THE BEST WAY TO FIGURE OUT HOW MANY YARDS OF CONCRETE YOU WILL NEED. First you need to figure out your width, and your length. Then you need to decide how thick you want it.If you want a 3-1/2" slab you need to convert 3-1/2" to decimal feet and inches which is .29 or if you want a 4" thick slab it should be this .33 ,so if you have an area that is 20'x30'x.29 (3-1/2") then divide by 27 (why 27?) because 27 is a cubic yard that's what you are trying to figure out, how many cubic yards. Now you take 20'x30'x.29 then divide by 27 and your answer will be 6.44444444 cu.yds. concrete trucks only carry 9-1/2 yds. always order a 1/2 yard more to be safe. If you are short the concrete co. will nail you for a short load fee plus everything they get you for! hope this helps!

Answer 4

First of all it should really be 6 inches thick to be strong, it should also have 1/4 inch or even 1/2 rebar in it, and also have about 3 to 4 inches of crush and run. Never pour straight on the mud. But ur question makes no sense so restate it and maybe u can get a real answer. U didnt even clearly say how big u want the slab to be. Three and a half what and what does "or drive the math of how it".

Answer 5

3 ft by 9 ft. is a yard but I don't know how to figure the inches. If you call a cement company they can help you. Or call a lumber yard. They would also know. Anyone in the phone book who does concrete work knows. Sorry I can't help more.

Answer 6

Concrete is measured in cubic yards. A cubic yard is 3' time 3' times 3'. Or 27 cubic feet, or 1728 cubic inches. Cubic measurement is height x length x width. So if you are working in inches, like 3.5" deep times width in inches times length in inches. Then divide by 1728 to convert it to cubic feet. Better yet. Tell the concrete company your dimensions and they will calculate it for you....

Answer 7

when I had to order concrete I called the company and they helped me figure it out. They were real nice, too. I think, you would multiply 3.5 feet x 3.5 feet x 4 inches= your answer, but just ask them to figure it for you.

Answer 8

Measure the length and the width, call you local hardware, Lowes or Home Depot and they will tell you how much and what you need to do it. And instruct you on how to do it rite.

Answer 9

wouldnt it be length width and height. and as long as you have everything in inches or feet the conversion is real easy just divide.

Answer 10

i use a project calculator i bought at the hardware store for 20$. it will figure any job you can possibly do on a house or what ever.