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Calcimator

Concrete Countertop Calculator

Estimate concrete mix, reinforcement, mold materials, and sealer for casting decorative concrete countertops.

Inputs

Results

Total material cost ($)

$117.18

≈ 8 movie tickets

Cost per sq ft ($)$6.76
Total area (sq ft)17.33
Portland cement (lbs)59.6
Sand (lbs)119.2
Pea gravel (lbs)119.2
AR glass fiber (lbs)0
Water (quarts)7.2
Rebar (linear ft)20.3
Food-safe sealer (quarts)0.7
Weight per piece (lbs)283
How to Use This Calculator
  1. Enter the length and width (depth) of each countertop piece in inches and set the thickness (standard is 1.5 in).
  2. Choose mix type: 1 for standard wet-cast (heavier, gravel + rebar) or 2 for GFRC (lighter glass-fiber-reinforced).
  3. Enter the number of pieces to cast — each section is calculated separately.
  4. Review Portland Cement (lbs), Sand (lbs), and Water (quarts) to batch your mix accurately.
  5. Note Weight per Piece (lbs) to plan safe lifting and verify cabinet load capacity.
  6. Use Total Material Cost and Cost per Sq Ft to compare DIY versus buying pre-cast countertops.

How the result changes with Length per piece (inches)

Length per piece (inches)Total material cost ($)
25$36.33
58$73.91
98$119.46
131$157.04

What each input means

Length per piece (inches)
Length of each countertop piece in inches (max 12 ft for manageability).
Width / depth (inches)
Front-to-back depth. Standard kitchen countertops are 25-26 inches.
Thickness (inches)
Slab thickness. Standard: 1.5". GFRC can be thinner (0.75-1").
Mix type (1-2)
1 = standard wet-cast (heavier, uses gravel + rebar). 2 = GFRC (lighter, uses glass fibers + polymer).
Number of pieces
Number of countertop sections to cast.

What each result means

Total material cost ($)
Estimated total cost for mix ingredients, reinforcement, mold, and sealer.
Cost per sq ft ($)
Material cost per square foot of countertop.
Total area (sq ft)
Combined surface area of all pieces.
Portland cement (lbs)
Type I/II portland cement needed.
Sand (lbs)
Fine silica sand or play sand.
Pea gravel (lbs)
3/8" pea gravel (wet-cast only; GFRC uses 0).
AR glass fiber (lbs)
Alkali-resistant glass fibers (GFRC only).
Water (quarts)
Mixing water for the concrete.
Rebar (linear ft)
3/8" rebar or pencil rod for wet-cast reinforcement.
Food-safe sealer (quarts)
Food-safe penetrating sealer, 2 coats both sides.
Weight per piece (lbs)
Approximate cured weight of each countertop section.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Length per piece (inches) = 96, Width / depth (inches) = 26, Thickness (inches) = 1.5, Mix type (1-2) = 1 = 5 input(s) provided
  2. Calculate Total material cost
    Total material cost = cementLbs * cementCostPerLb +
    117.18 = $117.18
  3. Calculate Cost per sq ft
    6.76 = $6.76
  4. Calculate Total area
    Total area = areaSqFt * numPieces
    17.33 = 17.33

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.

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