Free · Material quantities

Concrete Cylinders and Mix Volume Budget

Estimate cylinder concrete, bag equivalents or nominal volumetric ingredient recipes and their material cost.

  • Formula & worked example
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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Private by default

Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.

Formula and method

In initial displayed units, Diameter 100, Volume 1, Quantity 2, Concrete density 2000, Bag size 25, Waste 10, Cost of each bag of pre-mix concrete 5 gives Weight 2000, Total volume 1.1, Bags needed 88, Total cost 440, Cost per column 220.

Cylinder volume = π×diameter²×height×count/4; bag equivalents = concrete mass×(1+waste percentage/100)/bag mass.

Worked example

Enter these known values and leave the other values blank.

Diameter
100 cm
Volume
1000000 cm³
Quantity
2 pieces
Concrete density
2000 kg/m³
Bag size
25 kg
Waste
10 %
Cost of each bag of pre-mix concrete
5 USD /bag
Height
63.662 cm
Total volume
1100000 cm³
Weight
2000 kg
Equivalent concrete bags
88 bags
Cost of concrete per unit volume
440 USD / m³
Cost per column
220 USD /column
Equivalent bag material budget
440 USD

Assumptions and limitations

  • Diameter and height describe ideal cylinders. Bag equivalents are continuous and must be rounded up for purchase after checking actual yield. Ingredient volume ratios do not establish concrete strength, water/cement ratio, curing or actual mixed yield. The bag-based budget prorates the unrounded equivalent bag count; whole-bag purchase cost can be higher.
  • Use compatible measurement units. Clear an unknown before solving for it, and lock independent known values when comparing changes. Currency choices label amounts without exchange-rate conversion.

Common questions

Can I solve backward from the result?

Clear the unknown and enter independent known values. A rounded whole count cannot uniquely recover a continuous dimension; keep the original measured dimensions for procurement planning.

How many whole bags should I purchase?

Round the calculated mass-equivalent count upward to a whole bag and check the product yield. The mix-ratio options are volume arithmetic and do not certify concrete performance.

References

Enforce the stated physical geometry and whole-count domains. Integer membership is checked with isInteger, so ordinary, tiny and large fractional counts are rejected even when tolerant floor equality would pass. Bookify uses exact customary mass and volume definitions for density units, replacing rounded factors in the reference.

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