Essentially you are solving for volume and then converting to cubic yards. For concrete, the formula for volume is as follows: length x width x thickness. To determine how many bags of concrete you will need, divide the total cubic yards needed by the yield.
Full Answer
What is the formula for calculating concrete?
Three steps to ordering enough concrete:
- Use the concrete calculator
- Figure depths and widths as they have been built on the site, not simply what the plans say.
- Add a margin of safety
How do you calculate cost per cubic yard of concrete?
To get the most out of your concrete project, follow these installation tips:
- Be precise in your measurements. ...
- Have the proper tools on hand. ...
- Build a proper form for your project. ...
- Use a level to make sure you have the correct grade on your slope and to allow water to drain away from buildings.
- If you need a stronger slab, reinforce the concrete with wire mesh or rebar.
How do you figure how much concrete to use?
Figure out the amount of concrete to use by calculating the volume of the desired concrete slab and the footings supporting the slab, then converting this area to cubic yards. The method for calculating the volume of concrete needed for slabs is also used for any concrete structure.
How do I calculate the amount of cement needed?
- Mark the area that will need concrete and divide it into smaller areas.
- Calculate the volume of the area after determining the shape of the area (see the chart below) by multiplying in the thickness of the concrete.
- Convert the volume from feet to cubic yards to get the number of cubic yards of concrete you’ll need.
How much concrete do I need calculator?
How to calculate concrete:Determine how thick you want the concrete.Measure the length and width that you'd like to cover.Multiply the length by the width to determine square footage.Convert the thickness from inches to feet.Multiply the thickness in feet by the square footage to determine cubic feet.More items...•
How do you calculate how much cement you need for a slab?
How do I calculate how much concrete I need for a slab?Measure the area in feet.Multiply length by width, and then by thickness.Divide the resulting number by 27 to find cubic yards.
How many 80lb bags of concrete do I need for a 12x12 slab?
Regarding this, “how much concrete do I need for a 12×12 slab?”, at 4 inches thick, generally you will need approximately 1.76 cubic yards or 47.52 cubic feet or 1.35 m3 (either 104 bags of 60lb or 80 bags of 80lb) of premixed concrete for a 12×12 slab, at 5 inches thick slab, 2.22 cubic yards or 59.90 cubic feet or ...
How do you figure square footage for concrete?
Multiply the length times the width for square footage. For instance, if you plan to pour a concrete driveway that will be 25 feet long and 12 feet wide, the square footage would be 300 square feet.
How much concrete do I need for a 10x10 slab?
At 4″ thick, for a 10×10 slab, generally, you will need 1.23 cubic yards or 33 cubic feet or either 74- 60lb or 56-80lb bags of premixed concrete.
How many 20kg bags of cement makes a cubic Metre of concrete?
There are 110 bags of 20kg of concrete in a cubic metre. 1 cubic metre of concrete weighs 2200kg, so, number of bags of 20kg of concrete in a cubic metre = 2200 ÷ 20 = 110 bags. So, approximately there are 110 bags of 20kg of concrete in a cubic metre.
How many square feet does a 80lb bag of concrete cover?
80 lb bag of concrete cubic feet 80 lb bag of concrete yields 0.60 cubic feet which is approximately around 0.0222 cubic yards that will cover around 3.6 sq ft area up to standard depth of 2 inch excavation or backfills, and for 1 cubic feet of landfill you will need 1.66 bags of 80 lb concrete.
How many square feet does a 60 lb bag of concrete cover?
60lb bag of concrete A 60 lb bag of concrete is premixed of cement, sand and gravel as concrete which yields 0.45 cubic feet volume that is approximately equal as 0.017 cubic yards and it will cover around 1.8 square feet area of upto standard depth of 3 inch for your Patio or sidewalk.
How many bags of concrete do I need for 100 square feet?
Number of cement bags are required for 100 sqft 6 inch slab = 11.4 bags.
How many yards of concrete do I need for a 24x24 slab?
7.11 yardsFor example, for a concrete slab that is 24' X 24' X 4”, simply enter 4 in the Thickness/Depth field, 24 in the Width field, and 24 in the Length field. Click “Calculate”. Your answer should be 7.11 yards. Note: The Concrete Volume Calculator can also be used to determine yardage for aggregate products.
How much concrete do I need for a 4x8 slab?
At 4 inch thick, for a 4×8 slab, you will need either twenty three 60- pounds or eighteen 80- pounds or thirty six 40- pounds bags of concrete. Thus, either 23- 60lb or 18- 80lb or 36- 40lb bags of concrete will be required for a 4×8 slab at 4″ thick.
How many square feet is a yard of concrete 4 inches thick?
81 square feetOne Cubic Yard of Concrete: 4-inches thick – covers 81 square feet.
Estimating How Much Concrete You Need
Our calculator can estimate the yards of concrete needed by entering the project dimensions in imperial or metric measurements, including inches, f...
Estimating The Cost to Install Concrete
The average cost to install a concrete slab is $6 – $16 per square foot. In addition to the cost of the concrete itself, there are also labor costs...
Preparing to Pour Concrete
Much of the work to pour concrete is done before the truck even arrives at the project. The site must be measured and laid out. Forms must be insta...
Tips For Ordering Concrete
Call your concrete supplier and tell them about your project and what the project is. Ask them to advise you on the proper mix given your applicati...
How long does it take for concrete to cure?
The process of concrete hardening once it has been placed is called curing, and is a slow process. It typically takes concrete around four weeks to reach over 90% of its final strength, and the strengthening can continue for up to three years. Ensuring that the concrete is damp can increase the strength of the concrete during the early stages of curing. This is achieved through techniques such as spraying concrete slabs with compounds that create a film over the concrete that retains water, as well as ponding, where concrete is submerged in water and wrapped in plastic.
How is concrete made?
Concrete can be purchased in multiple forms, including in 60 or 80-pound bags, or delivered in large amounts by specialized concrete mixer trucks. Proper mixing is essential for the production of strong, uniform concrete. It involves mixing water, aggregate, cement, and any desired additives. Production of concrete is time-sensitive, and the concrete must be placed before it hardens since it is usually prepared as a viscous fluid. Some concretes are even designed to harden more quickly for applications that require rapid set time. Alternatively, in some factory settings, concrete is mixed into dryer forms to manufacture precast concrete products such as concrete walls.
Why is concrete mixing important?
Proper mixing is essential for the production of strong , uniform concrete. It involves mixing water, aggregate, cement, and any desired additives. Production of concrete is time-sensitive, and the concrete must be placed before it hardens since it is usually prepared as a viscous fluid.
What is cement used for?
Cement is a substance that is used to bind materials, such as aggregate, by adhering to said materials, then hardening over time . While there are many types of cement, Portland cement is the most commonly used cement, and is an ingredient in concrete, mortar, and plasters.
Is concrete time sensitive?
Production of concrete is time-sensitive, and the concrete must be placed before it hardens since it is usually prepared as a viscous fluid. Some concretes are even designed to harden more quickly for applications that require rapid set time.
Where to find Quantity and/or Coverage Calculations for Quikrete?
Quantity and/or coverage calculations for all QUIKRETE® products can be found on all Spec Data sheets .
How many ounces of QUIKRETE mortar joint sealant?
The calculator will indicate the number of 10.1 oz. tubes of QUIKRETE ® Polyurethane Mortar Joint Sealant or 10.1 oz tubes of Mortar Repair you will need for your project.
How deep should a post hole be?
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.
How deep should a sandbox be?
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.
How to calculate how much concrete I need for a slab?
How do I calculate how much concrete I need for a slab? To calculate the amount of concrete you need for a slab, you should find the cubic yardage of the area you will be filling. Just follow these steps: Measure the area in feet. Multiply length by width, and then by thickness.
How to calculate cubic yard of slab?
Once you find the dimensions of your slab, input them into the calculator along with the thickness. Enter your project area measurements rounded to the nearest foot. If you’d rather do the math yourself, simply measure length, width and height in feet. Then multiply these dimensions together. Divide the resulting number by 27 to find the cubic yardage.
How many square feet does an 80 lb bag of concrete cover?
One 80lb -bag covers an area of about 2 square feet, for a slab 4 inches thick. Two 60lb -bags of concrete cover an area of about 2 square feet for a slab that is 6 inches thick.
How many cubic yards of concrete can a truck hold?
A truckload of concrete can usually hold a maximum of 10 cubic yards.
What factors affect the cost of concrete?
There are several things that can affect the cost of your concrete project, including: How complicated the project is: stairs will likely cost more than a slab, for example. Materials: polymer concrete is often more expensive. Labor prices: jobs that take longer and need more workers will have a higher price.
How long does it take for concrete to harden?
Here are a few common varieties of concrete: Quick-set: Hardens in 20 to 40 minutes. Best for small projects. Regular-set: 24 to 48 hour set time. Used more for large projects. High-strength: Usually sets in 10 to 12 hours.
Does adding rebar to concrete cost more?
Extra strength: adding rebar or mesh to the concrete will up the cost. Additional tasks: if pros need to remove debris, get rid of your existing patio or dig before starting, it will be more expensive.
What is cubic yard to be filled?
Cubic Yards to be filled = (L * W * 0.5 / 27);
Who must enter an email address for a calculator?
Anyone who uses your calculator must enter an email address or phone number. We’ll send you an email report with contact information each time your calculator is used.
How much does concrete cost per yard?
When evaluating the cost of concrete, consider $130 per yard as an average number. However, concrete pricing different in local areas, also add an extra delivery fee, plus labor charges if hiring a contractor.
How much does it cost to have concrete poured?
You can estimate an average cost of $4.25 – $6.25 per square foot to have a regular concrete floor slab poured. Thus, if you require a more accurate number of your project’s cost, please request a free estimate from the local contractors in New York City.
How many yards of concrete do you need for a truck?
In that case, you can use our Concrete Calculator to get an idea of how many yards you will need. The average truck holds between 9 and 11 yards total. If your project requires more concrete, multiple trucks will be necessary.
Can you have concrete delivered?
If you’re purchasing bagged concrete, you may be able to have it delivered, but if it is only a few bags, you’ll be responsible for transporting it yourself. Moreover, you’ll also need additional equipment for mixing the concrete. A rented mixer can be very helpful, but a wheelbarrow works for just a few bags.
How much to add to slab for concrete?
Rule of thumb: add 1 / 4 ” to the thickness of your slab for your slab concrete budget. This assumes you have the job evenly graded to the right depth, and the grade is well compacted.
How to find cubic yards of concrete?
Essentially you are solving for volume and then converting to cubic yards. For concrete, the formula for volume is as follows: length x width x thickness.
How many linear feet are there in a 6' step?
The porch also has 9 linear feet of 6″ step. So enter in the footing calculator, 6″ depth by 12″ width (always figure steps with a 12″ width) by 9′ length. This totals .17 cubic yards.
How to convert cubic feet to yards?
Convert cubic feet to cubic yards by multiplying by .037
How thick is a 12x12 footing?
This 12″ x 12″ footing needs to be calculated 12″ x 16″ so the footing is figured to go above grade to reach the 4″ slab thickness.
How many yards of concrete do you need to order?
Many ready mix companies will have a minimum order of 1 yard, and will charge shortage fees when ordering partial batches. The average truck holds between 9 and 11 yards total. If your project requires more concrete, multiple trucks will be necessary.
Can you have bagged concrete delivered?
If you’re purchasing bagged concrete you may be able to have it delivered, but if it is only a few bags you’ll be responsible for transporting it yourself. You’ll also need additional equipment for mixing the concrete. A rented mixer can be very helpful, but a wheelbarrow works for just a few bags.
How to calculate square footage of concrete?
Get the right length and width of the area that you want to cover. Multiply the length by width so that you can get the correct square footage. Convert the thickness of the concrete from inches to feet. After your conversion, multiply the concrete's thickness in feet by the square footage to get cubic feet.
How many yards of concrete do you need to order?
Many ready-mix companies will have a minimum order of 1 yard and charge shortage fees when ordering partial batches. The average truck holds between 9 and 11 yards total.
What is formwork construction?
Constructing formwork commonly amounts to a signification portion of the concrete work's entire cost. That's why you must first determine the formwork type that you'll use for your project before starting it. It's best to distinguish the formwork type you'll use, its installation process, and whether you'll buy or rent the form materials. Meanwhile, other associated costs can include renting equipment such as a crane to move and form materials. These machines can also create release products and re-using form material.
Why is my concrete slab dark?
There are times when concrete can also have light or dark patches because of improper installation techniques. Stains from materials such as automobile fluids and cleaning chemicals can cause it , too. So, as soon as you notice any stains or discolorations, it's best to address it as quickly as possible. Doing so will prevent the stains from seeping in and spreading throughout the entire concrete slab.
How does concrete help in building?
Concrete buildings can moderate the temperature conditions inside the building. Thus, reducing the need for heating and cooling over its service life. When combined with other technologies such as hydronic heating, concrete can boost energy efficiency by up to 70%. Versatile.
What is concrete used for?
When it comes to construction, concrete is man's commonly used material on earth. It's a crucial part of any buildings, roads, dams, and bridges. Furthermore, it also uses a range from different structural applications to drains, curbs, and paviors.
How long does concrete last?
Low maintenance. Unlike other alternative building materials, concrete can last for decades, even when it's barely maintained. Because of it, you barely have to spend anything when it comes to maintaining the concrete. Even more, it reduces your environmental footprint since you require less reconstruction to retain it.