How to measure how much concrete i need

Readymix Concrete Calculator

Use the Readymix Concrete Volume Calculator to calculate the volume of concrete you require for your job. If you are not sure of how to calculate the volume of different shapes, you can use the Common Shape Calculator which will provide you with the appropriate equations.

Frequently Asked Questions  

How much concrete is in a yard?

Concrete volume is measured in cubic yards. When poured on a perfectly level surface, one cubic yard will cover 27 square feet at one foot thick.

How much does a yard of concrete weigh?

A solid, unbroken slab of concrete weighs about two tons (or 4,000 pounds) per cubic yard. Breaking up concrete roughly halves the total weight per cubic yard to about one half ton (or about 2,000 pounds).

How many bags of concrete are in a yard?

To produce one yard of concrete, you’ll need to use about 45 80-pound bags (or 90 40-pound bags). Because of the time and labor required to prepare such a large quantity, it is usually more cost- and time-effective to have ready mix concrete delivered.

Should I buy bagged concrete or have ready mix delivered?

CEMEX specializes in ready mix concrete formulated to your exact specifications and delivered to your job site. Larger jobs can be completed much more easily and efficiently when you order ready mix concrete by the yard. Ready mix concrete is ideal for large patios, driveway renovation, pool decks, home foundation slabs, parking lots, and new sidewalk construction. If you’re just doing some DIY maintenance around your home property, a yard of concrete is going to be far more than you’re able to use. In these cases, it makes more sense to purchase bagged products and mix them yourself. Examples of smaller projects include minor repairs (curbs, sidewalks, stairs, etc.), ramps, small patios, and setting fence posts.

What’s the minimum amount of ready mix concrete I can order?

CEMEX has a minimum order volume of 1cubic yard per delivery.

How much extra should I order?

Ordering the exact amount of concrete, you need for a job is a recipe for disaster. As a general rule, you should add an additional margin of 10 to 15% to your order to account for things like spillage while pouring, uneven subgrades, and other variables. Coming up short on a concrete pour will always be far more expensive than the cost of factoring in extra concrete from the start. The project timeline gets delayed, you have to pay your crew for the additional time spent, and you have to account for the cost of dispatching another truck to the job site – all factors which eat into your budget and hurt your bottom line. The quality of the pour itself is also likely to suffer – time is of the essence when pouring concrete, so you run the risk of having a cold joint occur where the two separate pours do not combine seamlessly. In a worst-case scenario, you may have to tear it all up and start over.

The calculator will estimate the volume of concrete or aggregate needed for your project.


You can calculate how much concrete you need for your construction project using this calculator that works in both US Customary Units (feet and inches) and International System of Units or metric units (meters and centimeters) of measurement.

Most concrete purchases will be made in cubic yards, which equates to 27 cubic feet. For example, a project measuring 10 ft in length by 10 ft in width with a depth of 3.5 in will be just over 1 cubic yard. The equivalent to a single cubic yard in metric measurements would be roughly 0.76 cubic meters.

The output of this calculation should make it simple for you to work out the estimated cost of the concrete materials that you require. For more specific pricing, contact your CEMEX sales representative to discuss.

There’s rarely a perfect pour in any project, so you may consider adding a little extra contingency to your order to account just to be on the safe side. The amount you decide to order will depend on the size and complexity of your site and project. It’s also important to know how this will affect your overall budget.

The concrete calculator should help you get started on the planning phase of your project. Be sure to discuss with your sales rep when you are ready to order your concrete.

To use the calculator:

  • Choose units of measure: English or Metric.
  • Enter the width, length, and thickness of the project.
  • Select whether you are measuring thickness in feet or inches.
  • Click Calculate.

You can use this concrete calculator to help you determine the number of bags of QUIKRETE® Concrete Mix, Mortar Mix, or Fast-Setting Concrete you will need for the following projects. (All calculations are rounded up to the next highest whole bag).


Concrete Mixes

Enter the size of the slab you want to build in square feet.

The calculator will indicate the number of bags you will need to build a 4 inch or 6 inch slab. (all yields are approximate and do not allow for uneven substrate, waste, etc.)

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Mortar Mix

Enter the number of 8 inch x 2 inch x 4 inch bricks or 8 inch x 8 inch x 16 inch blocks you plan to use for your project.

The calculator will indicate the number of 60 or 80 pound bags of QUIKRETE® Mortar Mix you need to construct your project with a 3/8 inch mortar joint. (All yields are approximate and do not include allowance for uneven subgrade, waste, etc.)

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Fast-Setting Concrete Mix

Enter the approximate depth of the post hole you want to dig in inches.

Remember, the depth of the post hole should be one-half of the above-ground post height. (Example: For a 6 feet above ground post, use a post with an overall height of 9 feet and place 3 feet in the ground). The calculator will indicate the number of 50 lb. bags of QUIKRETE® Fast-Setting Concrete you need.

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Base Coat Stucco & Finish Coat Stucco

Enter the area of your wall in square feet excluding window and door openings.

The calculator will indicate the number of 80 lb bags of QUIKRETE ® Base Coat Stucco and Finish Coat Stucco you will need to construct your stucco wall using a traditional 3 coat or 2 coat application process. (All yields are approximate and do not allow for uneven application thickness, waste, etc.)

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Veneer Stone Mortar

Enter the area of your wall in square feet, excluding window and door openings.

The calculator will indicate the number of 80 lb. bags of QUIKRETE ® Veneer Stone Mortar you will need to construct your wall, including the scratch coat, bond coat and jointing mortar application. (All yields are approximate and do not allow for uneven application thickness, waste, etc.)

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QUIKWALL ® Surface Bonding Cement

Enter the total area of your wall in square feet and make sure you count all surface areas, including both sides of the block, the top and the ends.

The calculator will indicate the number of 50 lb. bags you will need to coat all sides of your wall with QUIKWALL ® Surface Bonding Cement. (All yields are approximate and do not allow for uneven application thickness, waste, etc.)

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Concrete Crack Sealants

Enter the approximate length of the crack you will be repairing in feet.

The calculator will indicate the number of 10.1 oz. tubes of QUIKRETE ® Polyurethane Concrete Crack Sealant or 10.1 oz tubes of Concrete Repair you will need for your project.

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Mortar Joint Sealants

Enter the approximate length of the mortar joint you will be repairing in feet.

The calculator will indicate the number of 10.1 oz. tubes of QUIKRETE ® Advanced Polymer Mortar Joint Sealant or 10.1 oz tubes of Mortar Repair you will need for your project.

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Polymeric Jointing Sands

Enter the number of square feet of pavers on your project.

The calculator will indicate the approximate number of Polymeric Jointing Sand bags you will need for your project. (Based on standard 2 inch x 4 inch x 6 inch pavers. Usage will be different for other paver sizes and for use with natural stone.)

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Hardscapes Rocks and Sands

Enter the size of the sand box area in square feet.

The calculator will indicate the number of bags you will need to fill the sand box at a 2", 3", 4", 5" and 6" depth.


Hardscapes Patio Paver Sand

Enter the size of the area you need to cover in square feet.

The calculator will indicate the number of bags you will need to cover the area at a 1/8", 1/4", 3/8", 1/2", 3/4", 1" and 2" depth.

How many yards is a 20x20 concrete slab?

Step 2 :- converting cubic feet into cubic yard:- now converting into cubic yard, you should divide it by 27, because 1 cubic yard = 27 cubic foot, so volume of concrete you needed for 20×20 slab at 4 inch thick in cubic yard = 132/27 = 4.88 cubic yard.

How much concrete do I need for a 10x10 slab?

The amount you will need for a 10 x 10 slab is 1.3 cubic yards, we always add an extra 10% to allow for any slab depth variations or spills that may occur.

How do I figure out how many cubic metres of concrete I need?

1 cubic meter (1m3) can be visualised by drawing a cube 1 meter wide x 1 meter tall x 1 meter depth. To calculate the concrete volume of a concrete slab you multiply the length, width and depth of the concrete slab to get an estimate of the amount of concrete you need in cubic metres m3.

How many 80lb bags of concrete make a yard?

How many concrete bags do you need? One 80lbs bag of Quikrete Concrete Mix will yield approximately . 60 cu ft. So it will take 45 bag to equal one cubic yard of concrete.