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

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


What equation need to I usage to discover out just how much concrete ns need?

How to calculate concrete:

Determine just how thick you want the concreteMeasure the length and width the you’d like to coverMultiply the size by the width to recognize square footageConvert the thickness indigenous inches come feetMultiply the thickness in feet by the square clip to recognize cubic feetConvert cubic feet come cubic yards by multiplying by .037

Here’s what the mathematics looks choose 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 friend are addressing for volume and then converting to cubic yards. For concrete, the formula because that volume is as follows: size x width x thickness.

To determine how plenty of bags the concrete you will certainly need, division the total cubic yards necessary by the yield.

Use the following yields per each bag size:

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


Should ns order concrete through the garden from a ready mix firm or simply use bags?

Larger jobs such as driveways are simpler to complete when bespeak concrete through the yard, fairly than trying come mix bag after ~ bag by hand. For smaller jobs, choose a walkway, usual patio or footings, you need to calculate the variety of concrete bags instead.

Bagged concrete is right for:

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

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

Ready mixed concrete by the yard is great for:

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

If you’re planning to order concrete from a all set mix supplier, they’ll need to recognize how countless yards that concrete to deliver. Plenty of ready mix companies will have actually a minimum order of 1 yard, and will fee shortage fees once ordering partial batches. The mean truck holds between 9 and also 11 yards total. If your task requires an ext concrete, many trucks will be necessary.


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

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

If you examine your grade and one clues is 4", part spots are 4.5" come 5"-the finest solution because that both the project quality and also your concrete budget plan is to settle the grade.

Odd shapes: change odd shapes right into rectangles and also odd shapes are suddenly straightforward to figure.

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

Calculating the quantity of concrete required for footings

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

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

The excavator may have dug as well deep, or the may have actually rained and also footings required to it is in dug the end deeper to with firm soil. So that is crucial to check a variety of point out on your footing and also get an mean size. Then use the calculator to figure the amount of concrete needed.

House slabs on grade that space 8" the end of grade with a 4" slab additionally have several of the footing above the class too.

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

Estimating concrete steps

Steps seem tricky come calculate but are not. If there space three steps leading up to a porch:

Use the slab calculator to number the concrete essential 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 9 sq. Feet of porch surface, so enter in the slab calculator 4" thickness through 3" broad by 3" length. This totals .11 cubic yards.

The porch also has 9 linear feet that 6" step. So go into in the footing calculator, 6" depth by 12" width (always figure steps with a 12" width) by 9" length. This totals .17 cubic yards.

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

Repeat this for included layers the steps.

Calculating the amount of basic fill

Granite building has great base fill calculator on your site. Use this to figure how much material you need for the subgrade.

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

Never try to bespeak the exact amount of required concrete. Include a margin that safety.

A perfectly put order of concrete will end up the task with a tiny amount left over. A 20 cubic garden order through 1 cubic yard left end is a good order. A 20 cubic yard order the comes increase cubic yard quick is no a good order.

Extra costs of comes up quick of concrete

Overtime because that the crewA quick load charge from the prepared mix supplierA cold share can occur (where one to water ended and another pour began)

Three procedures to ordering enough concrete:

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

Rule of ignorance for margin the 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 can be upsetting to end up with any kind of extra concrete. Friend are having to pay because that this concrete after all. However, realize you room doing your project a company by ordering enough concrete - which way you space going to have a small concrete left.

Requesting your ready mix supplier to visit your site

After you have chosen a prepared Mix Supplier, have actually a representative involved your website to offer his/her opinion ~ above the amount required. Compare the number with what you come up with. Discuss any type of variances with the supplier.

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Your all set mix supplier is invaluable because that checking your check out of job conditions, checking her margin the safety, identifying problems you may not have actually thought of, and informing you of any type of local conditions you should be aware of.