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Concrete Calculator

Construction
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Calculates the amount of concrete and cement needed for slabs and blocks, based on dimensions and mix ratios.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Slab Length, Slab Width, Slab Thickness, Block Length, Block Width, Block Height, Number of Blocks, Concrete Mix Ratio (Cement:Sand:Aggregate), and Cement Bags per Cubic Yard (approx.) in the units shown.

Step 2

Read Block Volume (Cubic Inches), Slab Volume (Cubic Feet), Block Volume (Cubic Feet), Slab Volume (Cubic Yards), Total Block Volume (Cubic Feet), Total Block Volume (Cubic Yards), Total Concrete Volume (Cubic Yards), and Total Cement Bags (approx.) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

Example calculations

See the inputs and their calculated results.

Small Slab & Few Blocks

Slab Length: 5 feet; Slab Width: 5 feet; Slab Thickness: 0.33 feet; Block Length: 8 inches; Block Width: 8 inches; Block Height: 16 inches; Number of Blocks: 25 blocks; Concrete Mix Ratio (Cement:Sand:Aggregate): 1:2:3 (General Purpose); Cement Bags per Cubic Yard (approx.): 6 bags/yd³

Block Volume (Cubic Inches): 1,024 in³; Slab Volume (Cubic Feet): 8.25 ft³; Block Volume (Cubic Feet): 0.5925925926 ft³; Slab Volume (Cubic Yards): 0.3055555556 yd³; Total Block Volume (Cubic Feet): 14.81481481 ft³; Total Block Volume (Cubic Yards): 0.548696845 yd³; Total Concrete Volume (Cubic Yards): 0.8542524005 yd³; Total Cement Bags (approx.): 5.125514403 bags

Medium Slab & Blocks

Slab Length: 10 feet; Slab Width: 10 feet; Slab Thickness: 0.5 feet; Block Length: 8 inches; Block Width: 8 inches; Block Height: 16 inches; Number of Blocks: 50 blocks; Concrete Mix Ratio (Cement:Sand:Aggregate): 1:2:3 (General Purpose); Cement Bags per Cubic Yard (approx.): 6 bags/yd³

Block Volume (Cubic Inches): 1,024 in³; Slab Volume (Cubic Feet): 50 ft³; Block Volume (Cubic Feet): 0.5925925926 ft³; Slab Volume (Cubic Yards): 1.851851852 yd³; Total Block Volume (Cubic Feet): 29.62962963 ft³; Total Block Volume (Cubic Yards): 1.09739369 yd³; Total Concrete Volume (Cubic Yards): 2.949245542 yd³; Total Cement Bags (approx.): 17.69547325 bags

Large Slab & Many Blocks

Slab Length: 20 feet; Slab Width: 20 feet; Slab Thickness: 0.5 feet; Block Length: 8 inches; Block Width: 8 inches; Block Height: 16 inches; Number of Blocks: 100 blocks; Concrete Mix Ratio (Cement:Sand:Aggregate): 1:2:3 (General Purpose); Cement Bags per Cubic Yard (approx.): 6 bags/yd³

Block Volume (Cubic Inches): 1,024 in³; Slab Volume (Cubic Feet): 200 ft³; Block Volume (Cubic Feet): 0.5925925926 ft³; Slab Volume (Cubic Yards): 7.407407407 yd³; Total Block Volume (Cubic Feet): 59.25925926 ft³; Total Block Volume (Cubic Yards): 2.19478738 yd³; Total Concrete Volume (Cubic Yards): 9.602194787 yd³; Total Cement Bags (approx.): 57.61316872 bags

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