Density Constants
Standard Bag Yields
*Approximate yield after water addition.
Water Ratio Tip
Always start with 3/4 of targeted water. Excess water significantly reduces structural PSI.
Adding a 10% waste factor is industry standard to account for spills, uneven forms, and consolidation.
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Concrete Mix Calculator Logic
Frequently Asked Questions
Muhammad Shahbaz Siddiqui
Founder, TheCalculatorsHub
How I used the mix calculator to get the right ratio for a workshop floor
I was pouring a concrete floor for a small 12 m² workshop and wanted a 25 MPa mix that I could batch from raw materials rather than buying pre-mix. That meant calculating the correct volumes of cement, sand, and coarse aggregate to achieve the target strength without guessing the proportions.
I used this calculator with a 1:2:3 cement:sand:aggregate ratio and a 0.5 water-cement ratio for the 0.8 m³ volume I needed. The American Concrete Institute's mix design guidelines list the 1:2:3 ratio as suitable for general floor slabs up to 25 MPa. The calculator returned 160 kg cement, 320 kg sand, and 480 kg aggregate. I ordered those exact quantities, mixed in two batches, and the floor reached full strength within 28 days. No cracks visible 3 months later.