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`cM = f( L , W , T , "sWid" , "sLen" ) `

Enter a value for all fields

The **Concrete Countertop Mix** calculator estimates the materials needed for a solid rectangular concrete countertop with a rectangle sink opening.

**INSTRUCTIONS:** Choose units and enter the following:

- (
**L**) Length of Countertop - (
**W**) Width of Countertop - (
**T**) Thickness of Countertop - (
**sWid**) Sink Width - (
**sLen**) Sink Length

**Concrete Countertop Mix (cM):** The calculator returns the volume (measure) of materials needed for the countertop. The calculator returns:

- (PC) Weight of Portland Cement (Type 1 or Type 2)
- (AP) Alto-Pozz (pozzolans and mineral admixture)
- (SA) Sand / Aggregate (50/50 mixture)
- (WT) Water
- (FM) Fibermesh Reinforcement (PVA 8mm fibers)
- (WR) Water Reducer (Optimum 380 premium superplasticizer)
- (DF) Defoaming and Densifying additive

The calculator also returns:

- (V) Volume of concrete in countertop
- (W) Weight approximation of countertop
- (A) Surface area of countertop

The calculator first computes the volume of concrete needed for the countertop with a sink opening. The formula for the volume of concrete in a countertop with an opening for a sink is:

V = T* (L*W - sWid * sLen)

where:

- V = volume of concrete in the countertop
- L = Length of Countertop
- W = Width of Countertop
- T = Thickness of Countertop
- sWid = Sink Width
- sLen = Sink Length

Based on the volume of concrete, the following recipe is used for 1 cubic foot of concrete to compute the volume of materials for the countertop:

- 32 pounds of Portland cement
- 8 pounds of Alto-Pozz
- 90 pounds of 50-50 sand / aggregate mix
- 14.5 pounds of water (1.737 gallons)
- 200 grams of fiber mesh (PVA 8mm fibers)
- 120 ml plasticizer (Optimum 380 premium superplasticizer)
- 30 ml defoaming additive (C-64 defoaming & densifying additive)

Thanks to Everything About Concrete and Mike Day for the recipe above. His site provides valuable additional information and guidance.