Construction

Cement Calculator

Break a concrete volume into cement, sand and aggregate by mix ratio.

Length

Width

Thickness

Cement parts

Sand parts

Aggregate parts

Calculated Output

Cement (94 lb bags) (bags) 8

Sand 14.667

Aggregate 29.333

Formula: dry volume = wet volume × 1.54; split by mix ratio

Step-by-Step Breakdown

1. Values used:

2. Length = 10

3. Width = 10

4. Thickness = 4

5. Cement parts = 1

6. Sand parts = 2

7. Aggregate parts = 4

9. Cement (94 lb bags) = 8bags

10. Sand = 14.667

11. Aggregate = 29.333

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The math behind it

Wet (placed) volume × 1.54 ≈ the dry loose volume of materials needed (they compact when mixed with water).

Split the dry volume by the mix ratio. One 94 lb bag of Portland cement ≈ 1 ft³.

10×10×4 in (33.3 ft³ wet) at 1:2:4 → dry 51.3 ft³ → cement ≈ 8 bags, sand 14.7 ft³, aggregate 29.3 ft³.

What does 1:2:4 mean?

1 part cement, 2 parts sand, 4 parts coarse aggregate by volume — a common general-purpose mix (~M15).