Estimating reinforced concrete requires accurate measurements, records and calculations, which can save you money when the installation process begins. The average do-it-yourselfer can estimate his own reinforced concrete needs in one to two hours, depending on the size and scope of the project.
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Things you need
- Tape measure
- Writing pad
Measure the length and width of all areas to be poured with concrete. If you have a large area to pour with various sizes, break up the measurements in sections. For example, if you have a large slab that has a 10 feet by10 feet area and a smaller, connected area that is 5 feet by 5 feet, measure these sections separately, recording the measurements under separate heading on your paper.
Multiply the length times the width to get the total square footage of the section to be poured. Add all sections together to get a total square footage for your concrete pour. For example, a 10-foot by 10-foot section will total 100 square feet and a 5-foot by 5-foot area will total 50 square feet. Add these two together to get 150 square feet.
Multiply the total square footage by the thickness of the concrete pour. You will first need to convert inches to decimals. For example, if your slab is 4 inches thick, then convert those inches to feet by dividing 4 by 12 (inches), which is .33. Now multiply 150 square feet times .33 to get cubic feet of concrete capacity, which will be 49.5 cubic feet of concrete.
Convert the cubic feet of concrete to cubic yards to get a final estimate of concrete in cubic yards you will need to complete your project. Divide 49.5 cubic feet by 27 (the number of feet in a cubic yard) and you will have 1.83 cubic yards of concrete capacity to pour.
Multiply the total yards times the cost of concrete per yard to get an estimate of concrete cost. For example, if your local concrete supplier charges £65 per yard of concrete, then multiply 100 times 1.83 to get the total cost, which is £118, plus sales and use taxes, if any.
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