Enter the depth, width and also length of her concrete slab to calculate the number of cubic yards and concrete bags essential to complete your project..

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Use this complimentary concrete calculator come determine how much concrete you need. Knowing just how much concrete is essential for a job is very important. Learn just how to properly calculate how much concrete mix you will need for your job.


What equation have to I use to uncover out exactly how much concrete i need?

How to calculation concrete:

Determine how thick you desire the concreteMeasure the length and width that you’d favor to coverMultiply the length by the width to determine square footageConvert the thickness from inches to feetMultiply the thickness in feet by the square footage to recognize cubic feetConvert cubic feet to cubic yards by multiply by .037

Here’s what the mathematics looks choose 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 you are addressing for volume and then converting to cubic yards. Because that concrete, the formula for volume is together follows: size x broad x thickness.

To determine how many bags of concrete you will certainly need, divide the full cubic yards essential by the yield.

Use the adhering to yields every each bag size:

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


Should ns order concrete through the garden from a all set mix company or simply use bags?

Larger jobs such together driveways are simpler to finish when notified concrete through the yard, fairly than trying come mix bag after ~ bag through hand. For smaller sized jobs, choose a walkway, usually patio or footings, you need to calculate the variety of concrete bags instead.

Bagged concrete is right for:

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

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

Ready blended concrete by the yard is great for:

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

If she planning come order concrete native a all set mix supplier, they’ll need to know how countless yards of concrete come deliver. Numerous ready mix carriers will have a minimum order of 1 yard, and also will fee shortage fees when ordering partial batches. The typical truck holds in between 9 and 11 yards total. If your project requires much more concrete, many trucks will certainly be necessary.


Calculating the lot of concrete essential for slabs (including strange shapes)

Rule of thumb: include 1/4" to the thickness of your slab for her slab concrete budget. This suspect you have the job evenly graded come the appropriate depth, and the great is fine compacted.

If you check your grade and also one spot is 4", some spots room 4.5" come 5"-the best solution for both the job quality and your concrete spending plan is to solve the grade.

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

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

Calculating the amount of concrete essential for footings

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

This was an alleged to it is in a 12"*12" footing, but note just how the left next of the footing has actually collapsed. Calculation the true width.

The excavator may have actually dug as well deep, or it may have actually rained and also footings essential to it is in dug the end deeper to reach firm soil. So it is crucial to check a variety of clues on her footing and also get an typical size. Then usage the calculator to number the amount of concrete needed.

House slabs on grade that are 8" the end of grade through a 4" slab likewise have some of the footing above the grade too.

This 12" x 12" footing requirements to it is in calculated 12" x 16" for this reason the footing is figured to go above grade to reach the 4" slab thickness.

Estimating concrete steps

Steps it seems to be ~ tricky to calculate however are not. If there are three actions leading as much as a porch:

Use the slab calculator to figure the concrete required for the porch surface.Use the footing calculator to calculation the political parties of the porch and the steps

Here is an example:

This porch has actually 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 straight feet of 6" step. So go into in the footing calculator, 6" depth by 12" broad (always figure steps with a 12" width) through 9" length. This totals .17 cubic yards.

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

Repeat this for included layers of steps.

Calculating the lot of basic fill

Granite building and construction has wonderful base fill calculator on your site. Usage this to number how much material you require for the subgrade.

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

Never try to order the precise amount of needed concrete. Include a margin the safety.

A perfectly placed order that concrete will finish the task with a tiny amount left over. A 20 cubic yard order with 1 cubic yard left over is a great order. A 20 cubic yard order the comes up cubic yard quick is not a great order.

Extra costs of comes up short of concrete

Overtime because that the crewA short load fee from the ready mix supplierA cold joint can take place (where one to water ended and another pour began)

Three actions to ordering sufficient concrete:

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

Rule of ignorance for margin of safety:

If her order isOrder this much 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 have the right to be upsetting to end up with any type of extra concrete. Girlfriend are having to pay for this concrete ~ all. However, realize you room doing your job a business by ordering enough concrete - which method you room going to have actually a tiny concrete left.

Requesting your all set mix supplier come visit her site

After you have actually chosen a ready Mix Supplier, have actually a representative pertained to your website to offer his/her opinion on the quantity required. To compare the figure with what you come up with. Discuss any type of variances with the supplier.

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Your prepared mix providers is invaluable for checking your watch of job conditions, checking her margin the safety, identifying issues you might not have actually thought of, and informing girlfriend of any kind of local conditions you must be conscious of.