Converting sq. feet to yards for concrete.

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Converting sq. feet to yards for concrete.

Postby black » Thu Mar 17, 2005 11:12 pm

I have an area 1200 feet long and 30 feet wide or 36,000sq ft i need to know how many yards of concrete to purchase, and what is the formula used to derive answer.
black
 

Postby Guest » Fri Mar 18, 2005 7:33 pm

You have to know how thick you want the concrete to determine the volume to order. Lets suppose you want it 4" thick.

This needs to be expressed as a fraction of a foot, 4"/12 in per foot = 1/3 = 0.3333...

Volume is area x thickness = 36000 sq ft x 1/3 ft = 12000 cu ft.
(BUt this depends on the thickness you want. There are 3 feet per yard, so in cubic measure 3x3x3 = 27 cu ft/cu yd

12000 cu ft / 27 cu ft/cu yd = 444.5 cu yd
Guest
 

YOU DONT NEED ALL THAT MATH TO FIGURE OUT PER YARD

Postby DANO » Mon Apr 25, 2005 2:19 pm

Anonymous wrote:You have to know how thick you want the concrete to determine the volume to order. Lets suppose you want it 4" thick.

This needs to be expressed as a fraction of a foot, 4"/12 in per foot = 1/3 = 0.3333...

Volume is area x thickness = 36000 sq ft x 1/3 ft = 12000 cu ft.
(BUt this depends on the thickness you want. There are 3 feet per yard, so in cubic measure 3x3x3 = 27 cu ft/cu yd

12000 cu ft / 27 cu ft/cu yd = 444.5 cu yd

JUST ROUND IT OFF..SAY 10X10X3.5 IS ABOUT A YARD..CLOSE ENOUGH
VERY EASY
DANO
 

Postby Guest » Mon Apr 25, 2005 6:05 pm

A good bit short of 3.5" more like 3.25" (3.24 to be exact)

1 yd^3 = 3 ft x 3 ft x 36 in = 324 ft^2*inches

Spread over 10 square feet, that's 3.24" thick.
But still a handy idea as people tend to think in square feet of area and thickness in inches.
Guest
 

How to convert sq. feet to sq. meter

Postby vj » Tue Apr 26, 2005 1:25 am

Got my house lot about 1500 sq.feet and i dont kow how much if it going to convert sq.meter.please help me to calculate it.

Vj
vj
 

Postby Guest » Tue Apr 26, 2005 1:36 am

1500 ft^2 x (0.3048 m/ft)^2 = 139.5 m^2
Guest
 

I need to convert to yards for concrete

Postby Gary » Fri May 06, 2005 8:19 pm

I have a area 9ft x 12ft x 3" thick how much concrete :?:
Gary
 

Re: YOU DONT NEED ALL THAT MATH TO FIGURE OUT PER YARD

Postby Guest » Tue May 24, 2005 12:36 am

how much concrete would i need to pour 52,272 sq yards 1'1/2 deep![/quote]
Guest
 

Re: convert sq ft to yards

Postby Guest » Sat Jun 18, 2005 1:46 am

vj wrote:Got my house lot about 1500 sq.feet and i dont kow how much if it going to convert sq.meter.please help me to calculate it.

Vj
1500 sq ft = how many yards
Guest
 

Re: How to convert sq. feet to sq. meter

Postby Guest » Mon Aug 29, 2005 10:06 pm

vj wrote:Got my house lot about 1500 sq.feet and i dont kow how much if it going to convert sq.meter.please help me to calculate it.

Vj
Guest
 

Re: Converting sq. feet to yards for concrete.

Postby Guest » Sat Feb 11, 2006 12:57 am

black wrote:I have an area 1200 feet long and 30 feet wide or 36,000sq ft i need to know how many yards of concrete to purchase, and what is the formula used to derive answer.
Guest
 

Re: I need to convert to yards for concrete

Postby Guest » Sun Feb 19, 2006 9:10 pm

[quote="Gary"]I have a area 9ft x 12ft x 3" thick how much concrete :?:[/quote]="Frank" I have a area 5ft. x9ft. x 4" thick, how much concert?[/list]
Guest
 

Re: I need to convert to yards for concrete

Postby Guest » Sun Feb 19, 2006 9:16 pm

Anonymous wrote:
Gary wrote:I have a area 9ft x 12ft x 3" thick how much concrete :?:
="Frank" I have a area 5ft. x9ft. x 4" thick, how much concert?[/list]
Guest
 

Re: Converting sq. feet to yards for concrete.

Postby Guest » Thu Apr 06, 2006 8:24 pm

black wrote:I have an area 1200 feet long and 30 feet wide or 36,000sq ft i need to know how many yards of concrete to purchase, and what is the formula used to derive answer.
Guest
 

Re: Converting sq. feet to yards for concrete.

Postby Guest » Thu Apr 06, 2006 8:27 pm

black wrote:I have an area 1200 feet long and 30 feet wide or 36,000sq ft i need to know how many yards of concrete to purchase, and what is the formula used to derive answer.
Guest
 

Re: I need to convert to yards for concrete

Postby Guest » Mon May 22, 2006 11:26 pm

Gary wrote:I have a area 9ft x 12ft x 3" thick how much concrete :?:
Guest
 

Re: I need to convert to yards for concrete

Postby Guest » Sat Jun 03, 2006 4:56 am

Gary wrote:I have a area 3ft x 10ft x 6" thick how much concrete :?:
Guest
 

Re: How to convert sq. feet to sq. yard

Postby Guest » Tue Jun 20, 2006 4:18 am

vj wrote:Got my house lot about 1500 sq.feet and i dont kow how much if it going to convert sq.meter.please help me to calculate it.

Vj
Guest
 

How to convert sq. feet to sq. yard

Postby brianm1 » Wed Jul 12, 2006 6:08 am

Tell me if I'm right...

I'm pouring a 9.5' X 7.4' X 3"
9.5*7.4*.25 = 17.575
17.575/27 = 0.65 yards, which equals to little less than a yard.... right?

Or, if I round off to make sure I have enough of cement I could:

10*8*.25 = 20
20/27=.74 yards

Now I need to know how may bags of ready mix concrete I need.

How many bags 40 lbs bags would I need for .74 yards?
How many bags 40 lbs bags would I need for .65 yards?
How many bags 80 lbs bags would I need for .74 yards?
How many bags 80 lbs bags would I need for .65 yards?


Two more questions: I was told that I must have 4" because of the way the ready mix settles. Is this true? I will be mixing this myself and I want to save money too!
What would happen if I only poured 3"?
brianm1
 
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Joined: Wed Jul 12, 2006 5:42 am

Postby Dirtman » Wed Jul 12, 2006 9:21 am

Brian:

Your calculations are correct. And yes, always order a little more than you think you will need. The sub-base is never perfectly flat and more times than not, a little more is needed. Unless you order more . . . Murphy’s Law!

The reason concrete is poured at a predetermined minimum thickness is due to load bearing and structural strength, not how it settles. Four inches (4") is stronger than three inches (3") of course and if it’s anything but a small sidewalk, I suggest at least four inches.

If I remember correctly, an 80 pound bag of Sacrete (ready mix in a bag, just add water) makes 6/10ths of a cubic foot of concrete. That’s 45 bags a cubic yard. At 0.75 yards, that’s 34 bags. If it’s $3 a bag, that’s $102 not including tax . . . plus, you have to mix every bag!!! That takes time!!!

At four inches (4"), 0.87 yards * 45 = 40 bags

Save yourself aggravation and order a yard of concrete from a plant. There will be a short load charge but the cost should still be around $100 give or take. A quick call to the nearest plant and they will give you a price. The minimum strength I would pour would be 3000 psi mix (5 sack) but check city codes as many require stronger concrete.

FWIW, don’t get the concrete too wet as it’ll make the mix weaker. A good workable consistency is what you want.

If you're going to be walking on it after it's cured, don't get it too smooth or it'll be really slick when it gets wet. A light broom finish will make it safer for walking, especially if it's outside. When you get the concrete with the finish you want, cover it with plastic or a curing compound so the top doesn't dry too quick.

George
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Re: Converting sq. feet to yards for concrete.

Postby Guest » Thu Jul 20, 2006 6:37 am

black wrote:I have an area 1200 feet long and 30 feet wide or 36,000sq ft i need to know how many yards of concrete to purchase, and what is the formula used to derive answer.
Guest
 

Re: I need to convert to yards for concrete

Postby Guest » Sat Jul 22, 2006 8:00 pm

Gary wrote:I have a area 9ft x 12ft x 3" thick how much concrete :?:
Guest
 

Re: How to convert sq. feet to sq. yard

Postby Guest » Sun Jul 30, 2006 10:09 pm

Anonymous wrote:
vj wrote:Got my house lot about 1500 sq.feet and i dont kow how much if it going to convert sq.meter.please help me to calculate it.

Vj
Guest
 

Re: Converting sq. feet to yards for concrete.

Postby dlavender@adelphia.net » Mon Jul 31, 2006 4:59 am

black wrote:I have an area 1200 feet long and 30 feet wide or 36,000sq ft i need to know how many yards of concrete to purchase, and what is the formula used to derive answer.
dlavender@adelphia.net
 

Re: Converting sq. feet to yards for concrete.

Postby Guest » Fri Aug 25, 2006 12:32 am

black wrote:I have an area 1200 feet long and 30 feet wide or 36,000sq ft i need to know how many yards of concrete to purchase, and what is the formula used to derive answer.


lenght x width x depth divided by 81 = number of yards of concrete needed
Guest
 

Postby Dirtman » Sun Aug 27, 2006 4:29 am

lenght x width x depth divided by 81 = number of yards of concrete needed


Sorry but the formula you give is wrong.

This formula is similar to those found on some concrete calculators but . . . you don’t use depth in the calculation and it’s only for 4" thick concrete. The formula, provided that one chooses to use it, is length in feet * width in feet divided by 81. Again, this ONLY works for concrete that is 4" thick

A standard formula for calculating cubic yards is length (in feet) * width (in feet) * depth (in feet) divided by 27.

To convert inches to feet, divide inches by 12.

George
Dirtman
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TRUCK

Postby SOOZY » Thu Oct 12, 2006 12:24 am

I HAVE A TRUCK THAT IS 2000 SQ AND 6 IN. DEEP. HOW MANY TONS CAN IT HOLD?
SOOZY
 

Postby Guest » Tue Mar 13, 2007 2:25 am

LENGTH X WIDTH X .33 DEVIDED BY 27

THAT'S YOUR ANSWER
Guest
 

Postby Dirtman » Tue Mar 13, 2007 7:25 am

Anonymous wrote:LENGTH X WIDTH X .33 DEVIDED BY 27

THAT'S YOUR ANSWER


For what?
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Re: Converting sq. feet to yards for concrete.

Postby max » Sat May 12, 2007 3:51 pm

24 by 32 house with 8 inchwa;ll and a wall hight of 6feet with floor area of 4inchs dept
max
 

Converting sq. feet to yards for concrete.

Postby bhardas » Fri Oct 05, 2007 3:57 am

my driveway is 20ft. long 8ft wide and 6 inches deep the cost to pave this the quote is $8.95 per cubic yard.
I convert the volume = 20x8x.5 = 80 sq. feet.
so how do I convert sq. feet to cubic yard?
bhardas
 

Re: Converting sq. feet to yards for concrete.

Postby Dirtman » Fri Oct 05, 2007 8:18 am

bhardas wrote:my driveway is 20ft. long 8ft wide and 6 inches deep the cost to pave this the quote is $8.95 per cubic yard.
I convert the volume = 20x8x.5 = 80 sq. feet.
so how do I convert sq. feet to cubic yard?


8 x 20 is square feet. You calculated cubic feet . . . 8 x 20 x 0.5 = cubic feet. Divide cubic feet by 27 for cy (cubic yards), so 80 / 27 = 2.97 cy. Round up to 3 cy.

However, 3 cy is assuming a perfect subgrade. As nothing is perfect, add 10% to take an inperfect subgrade into account. Ordering 3.3 cy is much cheaper than getting a truck with 3 cy, finding out you need a little more concrete and having to order an additional 0.3 cy . . . at a short load price (3 cy in most locations).

If you're really going to pour this driveway (assuming this isn't a homework problem), write back as $8.95 per cy is way too cheap! The cement alone costs more than that (at a discount price)!

George
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Posts: 574
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Re: How to convert sq. feet to sq. meter

Postby Guest » Sat Jul 12, 2008 7:08 pm

vj wrote:Got my house lot about 1500 sq.feet and i dont kow how much if it going to convert sq.meter.please help me to calculate it.

Vj
330 sq.feet
Guest
 

cu yd

Postby Guest » Fri Apr 10, 2009 8:04 am

I have an area of 90' x 40' how do
i find out cu yd if
i want dirt 1" deep.
Guest
 


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