Enter the depth, width and also length of her concrete slab to calculation the variety of cubic yards and also concrete bags necessary to complete your project..

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Use this totally free concrete calculator come determine just how much concrete you need. Knowing just how much concrete is required for a project is incredibly important. Learn how to appropriately calculate just how much concrete mix girlfriend will need for your job.


What equation must I usage to uncover out how much concrete ns need?

How to calculation concrete:

Determine just how thick you want the concreteMeasure the length and also width that you’d favor to coverMultiply the size by the width to identify square footageConvert the thickness indigenous inches to feetMultiply the thickness in feet through the square footage to recognize cubic feetConvert cubic feet to cubic yards by multiplying by .037

Here’s what the math looks favor for a 10’ by 10’ concrete patio:

10 x 10 = 100 square feet4 ÷ 12 = .33100 x .33 = 33 cubic feet33 x .037 = 1.22 cubic yards

Essentially girlfriend are solving for volume and also then convert to cubic yards. For concrete, the formula because that volume is as follows: size x broad x thickness.

To identify how countless bags the concrete you will certainly need, divide the total cubic yards needed by the yield.

Use the complying with yields every each bag size:

40 pound bag returns .011 cubic yards60 pound bag yields .017 cubic yards80 lb bag yields .022 cubic yards


Should i order concrete by the yard from a all set mix company or just use bags?

Larger work such as driveways are much easier to complete when bespeak concrete by the yard, rather than trying come mix bag after bag through hand. For smaller jobs, like a walkway, usual patio or footings, you must calculate the number of concrete bags instead.

Bagged concrete is appropriate for:

Pouring little slabs for sidewalks or patiosSetting articles for fences or mailboxesMaking repair to structure walls, walkways or stepsPouring little curbs, steps, or rampsFootings because that decks, pergolas, walls and also more

If you’re purchasing bagged concrete friend may have the ability to have it delivered, yet if the is only a few bags you’ll be responsible for carrying it yourself. You’ll likewise need extr equipment for mixing the concrete. A rented mixer deserve to be an extremely helpful, but a wheelbarrow functions for simply a couple of bags.

Ready mixed concrete through the garden is good for:

Large patios, driveways, swimming pool decks and also moreFoundation slabs for a houseParking lots or commercial sidewalks

If you’re planning to order concrete native a prepared mix supplier, they’ll need to recognize how countless yards of concrete come deliver. Many ready mix suppliers will have actually a minimum stimulate of 1 yard, and also will fee shortage fees once ordering partial batches. The mean truck holds in between 9 and also 11 yards total. If your job requires an ext concrete, lot of trucks will certainly be necessary.


Calculating the quantity of concrete essential for slabs (including weird shapes)

Rule that thumb: include 1/4" come the thickness of her slab for her slab concrete budget. This presume you have actually the task evenly graded come the appropriate depth, and the class is fine compacted.

If you examine your grade and also one clues is 4", part spots space 4.5" to 5"-the ideal solution for both the job quality and also your concrete budget is to deal with the grade.

Odd shapes: transform odd shapes right into rectangles and also odd shapes are suddenly basic to figure.

Figure driveway 14" x 20" and also your estimate will be good. Here is why: The driveway is 16" at the top and 12" in ~ the bottom. Through the facility the width averages 14".

Calculating the amount of concrete needed for footings

Footings will seldom follow the drawing exactly. In rocky floor the footings might collapse when big rocks room excavated

This was an alleged to be a 12"*12" footing, however note exactly how the left next of the footing has actually collapsed. Calculation the true width.

The excavator may have actually dug too deep, or it may have actually rained and also footings necessary to it is in dug out deeper to with firm soil. So that is important to examine a range of spots on her footing and get an mean size. Then use the calculator to number the lot of concrete needed.

House slabs on grade that room 8" out of grade v a 4" slab likewise have few of the footing over the grade too.

This 12" x 12" footing needs to be calculated 12" x 16" so the footing is figured come go over grade to reach the 4" slab thickness.

Estimating concrete steps

Steps seem tricky come calculate yet are not. If there space three measures leading as much as a porch:

Use the slab calculator to figure the concrete essential for the porch surface.Use the footing calculator to calculation the sides of the porch and the steps

Here is one example:

This porch has 9 sq. Feet the porch surface, so go into in the slab calculator 4" thickness through 3" width by 3" length. This totals .11 cubic yards.

The porch likewise has 9 linear feet of 6" step. So get in in the footing calculator, 6" depth through 12" broad (always number steps with a 12" width) through 9" length. This totals .17 cubic yards.

The full concrete necessary for the 3" by 3" porch will certainly be .28 cubic yards. (.11 + .17 cubic yards = .28 cubic yards)

Repeat this for added layers of steps.

Calculating the lot of basic fill

Granite building and construction has terrific base to fill calculator on your site. Usage this to figure how much material you need for the subgrade.

Using a Margin that Safety: troubles Caused by underestimating the amount of Concrete

Never try to stimulate the exact amount of necessary concrete. Incorporate a margin of safety.

A perfectly placed order of concrete will complete the project with a little amount left over. A 20 cubic yard order v 1 cubic garden left end is a an excellent order. A 20 cubic yard order that comes increase cubic yard quick is no a good order.

Extra prices of comes up quick of concrete

Overtime because that the crewA brief load fee from the prepared mix supplierA cold share can take place (where one to water ended and another to water began)

Three actions to ordering sufficient concrete:

Use the concrete calculatorFigure depths and widths as they have actually been developed on the site, not simply what the to plan say.Add a margin that safety

Rule of ignorance for margin of safety:

If your order isOrder this lot extra
1-5 cubic yards.5-1 c.y. Extra
6-10 c.y.1 c.y. Extra
11-20 c.y.1-1.5 c.y. Extra

It deserve to be upsetting to finish up with any kind of extra concrete. You are having to pay because that this concrete after all. However, establish you space doing your task a business by ordering sufficient concrete - which means you space going to have a tiny concrete left.

Requesting your ready mix supplier come visit her site

After you have chosen a ready Mix Supplier, have a representative pertained to your website to give his/her opinion ~ above the amount required. Compare the figure with what you came up with. Discuss any kind of variances through the supplier.

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Your prepared mix supplier is invaluable because that checking your check out of project conditions, checking your margin the safety, identifying worries you may not have actually thought of, and informing girlfriend of any kind of local conditions you should be aware of.