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Calcimator

Concrete Overlay Calculator

Calculate overlay material bags, primer, sealer, and water for decorative concrete resurfacing by area and thickness.

Inputs

%

Results

Overlay bags (50 lb)

15

Total material weight (lbs)733
Primer / bonding agent (gal)1.8
Sealer (gal)4.4
Mixing water (gal)20.2
Total material cost ($)$1,088.27
Material cost per sq ft ($)$2.72
How to Use This Calculator
  1. Measure the existing concrete surface area in sq ft and enter the desired overlay thickness in inches.
  2. Select the overlay type: 1=micro-topping (1/16–1/8 in), 2=stampable overlay (1/4–3/8 in), 3=spray-texture, 4=heavy resurface (3/8–3/4 in).
  3. Set a waste factor of 10% for typical flat surfaces, or 15–20% for irregular shapes.
  4. Read Overlay Bags (50 lb) and Mixing Water (gal) to prepare your material order.
  5. Note Primer / Bonding Agent (gal) — all overlays require a bonding primer before application.
  6. Use Material Cost and Cost per Sq Ft to prepare bids or evaluate resurfacing versus replacement.

How the result changes with Surface area (sq ft)

Surface area (sq ft)Overlay bags (50 lb)
5,001184
17,501642
32,5001,192
45,0001,651

What each input means

Surface area (sq ft)
Existing concrete surface area to overlay.
Overlay thickness (inches)
Desired overlay thickness. Micro-topping: 1/16-1/8", stampable: 1/4-3/8", heavy: 3/8-3/4".
Overlay type (1-4)
1 = micro-topping, 2 = stampable overlay, 3 = spray-texture, 4 = heavy resurface.
Waste factor (%)
Extra for mixing losses and irregular surfaces. 10% is typical.

What each result means

Overlay bags (50 lb)
Number of 50-lb bags of overlay mix required.
Total material weight (lbs)
Total dry overlay material weight.
Primer / bonding agent (gal)
Bonding primer at ~250 sq ft per gallon.
Sealer (gal)
Protective sealer for two coats at ~200 sq ft per gallon.
Mixing water (gal)
Clean water needed to mix the overlay bags.
Total material cost ($)
Estimated cost for overlay, primer, and sealer.
Material cost per sq ft ($)
Material cost divided by total area.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Surface area (sq ft) = 400, Overlay thickness (inches) = 0.25, Overlay type (1-4) = 2, Waste factor (%) = 10 = 4 input(s) provided
  2. Calculate Overlay bags
    Overlay bags = ceil(bagsNeeded)
    15 = 15
  3. Calculate Total material weight
    Total material weight = bagsNeeded * 50
    733 = 733
  4. Calculate Primer / bonding agent
    Primer / bonding agent = (areaSqFt / 250) * (1 + wastePct / 100)
    1.8 = 1.8

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

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