Concrete Overlay Calculator
Imperial (ft/in/lbs)
Metric (m/cm/kg)
Project Name (Optional)
Length (
ft
)
Enter the longest side of the area
Please enter a valid number greater than 0
Width (
ft
)
Enter the perpendicular side
Please enter a valid number greater than 0
Thickness (
in
)
Typical overlay thickness is 0.25 to 0.5
in
Please enter a valid number greater than 0
Waste Factor (%)
Bag Size
60 lb bags
80 lb bags
10 ft
10 ft
4 in
Total Area
0 sq ft
Total Volume Required
0 cu yd
Estimated Structural Weight
0 lbs
Total Material Requirements
0 bags
Volume with
10
% Waste
0 cu yd
Download Professional Report (PDF)
How to Use This Calculator
Measure:
Accurately measure the length and width of the area to be overlaid.
Determine Thickness:
Standard concrete overlays range from 0.25 to 0.5 inches. Thicker overlays may require structural evaluation.
Adjust Waste Factor:
A 10% waste factor is recommended to account for spillage, uneven subgrades, and minor miscalculations.
Download Report:
Use the PDF button to generate a professional summary to share with contractors or keep for your records.
Formula Used
Area:
Length × Width
Volume:
Area × (Thickness ÷ 12) [Imperial] OR Area × (Thickness ÷ 100) [Metric]
Weight:
Volume × 150 lbs/cu ft [Imperial] OR Volume × 2400 kg/cu m [Metric]
Bag Count:
Ceiling(Volume in cu ft ÷ 0.60) for 80lb bags, or ÷ 0.45 for 60lb bags. (Metric: ÷ 0.0168 for 40kg, ÷ 0.0105 for 25kg).
Waste Adjustment:
Final Volume × (1 + (Waste % ÷ 100))
Pro Tips for Concrete Overlays
Surface Prep is Critical:
The existing concrete must be clean, sound, and profiled (e.g., shot-blasted or acid-etched) for proper bonding.
Use a Bonding Agent:
Always apply a latex or epoxy bonding agent before pouring the overlay to prevent delamination.
Curing:
Keep the overlay moist and covered with plastic sheeting for at least 3–7 days to prevent shrinkage cracking.