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

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Use this complimentary concrete calculator to determine how much concrete girlfriend need. Knowing how much concrete is needed for a project is exceptionally important. Learn how to effectively calculate how much concrete mix girlfriend will need for your job.


What equation must I use to find out just how much concrete ns need?

How to calculation concrete:

Determine how thick you desire the concreteMeasure the length and also width that you’d prefer to coverMultiply the size by the broad to recognize square footageConvert the thickness native inches to feetMultiply the thickness in feet through the square footage to recognize cubic feetConvert cubic feet to cubic yards by multiply by .037

Here’s what the math looks favor for a 10’ through 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 resolving for volume and then converting to cubic yards. For concrete, the formula for volume is as follows: size x width x thickness.

To identify how numerous bags that concrete you will certainly need, divide the complete cubic yards necessary by the yield.

Use the following yields per each bag size:

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


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

Larger work such together driveways are simpler to complete when notified concrete by the yard, quite than trying to mix bag ~ bag by hand. For smaller sized jobs, favor a walkway, modest patio or footings, you need to calculate the number of concrete bags instead.

Bagged concrete is appropriate for:

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

If you’re purchasing bagged concrete you may have the ability to have it delivered, yet if it is only a couple of bags you will do it be responsible for delivering it yourself. You’ll likewise need extr equipment for mixing the concrete. A rented mixer have the right to be really helpful, yet a wheelbarrow works for simply a couple of bags.

Ready blended concrete by the garden is good for:

Large patios, driveways, swimming pool decks and also moreFoundation slabs for a houseParking too many or advertisement sidewalks

If she planning to order concrete indigenous a ready mix supplier, they’ll require to understand how numerous yards the concrete come deliver. Many ready mix suppliers will have a minimum bespeak of 1 yard, and will fee shortage fees once ordering partial batches. The typical truck holds in between 9 and also 11 yards total. If your job requires more concrete, lot of trucks will certainly be necessary.


Calculating the lot of concrete needed for slabs (including odd shapes)

Rule that thumb: include 1/4" come the thickness of your slab for your slab concrete budget. This assumes you have actually the job evenly graded come the ideal depth, and the class is well compacted.

If you inspect your grade and also one point out is 4", some spots room 4.5" to 5"-the best solution because that both the job quality and your concrete spending plan is to solve the grade.

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

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

Calculating the quantity of concrete necessary for footings

Footings will rarely follow the drawing exactly. In rocky floor the footings may collapse when big rocks are excavated

This was an alleged to be a 12"*12" footing, yet note how the left next of the footing has collapsed. Calculate the true width.

The excavator may have dug too deep, or that may have actually rained and footings required to be dug out deeper to reach firm soil. So it is necessary to examine a selection of point out on your footing and get an average size. Then usage the calculator to figure the lot of concrete needed.

House slabs on class that are 8" the end of grade through a 4" slab additionally have few of the footing over the great too.

This 12" x 12" footing needs to it is in calculated 12" x 16" therefore the footing is figured come go above grade to with the 4" slab thickness.

Estimating concrete steps

Steps seem tricky come calculate however are not. If there space three procedures leading approximately a porch:

Use the slab calculator to number the concrete required 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 additionally has 9 linear feet that 6" step. So get in in the footing calculator, 6" depth through 12" broad (always number steps through a 12" width) through 9" length. This totals .17 cubic yards.

The complete concrete necessary for the 3" through 3" porch will 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 construction has terrific base to fill calculator on your site. Usage this to figure how much product you require for the subgrade.

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

Never try to bespeak the exact amount of needed concrete. Encompass a margin the safety.

A perfectly placed order of concrete will finish the project with a small amount left over. A 20 cubic yard order v 1 cubic yard left end is a an excellent order. A 20 cubic garden order that comes increase cubic yard brief is no a great order.

Extra costs of coming up brief of concrete

Overtime for the crewA brief load charge from the ready mix supplierA cold joint can occur (where one pour ended and another to water began)

Three procedures to ordering sufficient concrete:

Use the concrete calculatorFigure depths and also widths together they have been constructed on the site, not just what the plans say.Add a margin that safety

Rule of thumb for margin of safety:

If her 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 end up with any kind of extra concrete. Friend are having actually to pay because that this concrete ~ all. However, establish you room doing your task a company by ordering sufficient concrete - which method you room going to have actually a tiny concrete left.

Requesting your prepared mix supplier come visit your site

After you have actually chosen a prepared Mix Supplier, have actually a representative concerned your website to offer his/her opinion top top the quantity required. Compare the figure with what you come up with. Discuss any kind of variances with the supplier.

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Your ready mix supplier is invaluable for checking your view of job conditions, checking her margin that safety, identifying problems you may not have actually thought of, and also informing you of any local conditions you must be aware of.