Concrete Resurfacing Coverage Calculator
Estimate the amount of concrete resurfacer (in bags or gallons) needed for your project based on the surface area and desired application thickness.
Formulas Used
Surface Area:
Area (sq ft) = Length (ft) × Width (ft)
Volume Required:
Volume (cu ft) = Area (sq ft) × (Thickness (in) ÷ 12)
Adjusted Volume (with waste):
Adjusted Volume = Volume × (1 + Waste% ÷ 100)
Bags Required (50 lb bag):
Coverage per bag (sq ft) = 5.375 ÷ Thickness (in)
Derived from: 50 lb bag covers ~43 sq ft at 1/8" (0.125") thickness
Bags = ⌈ Area ÷ Coverage per bag × Waste Factor ⌉
Gallons Required (liquid resurfacer):
Coverage per gallon (sq ft) = 6.25 ÷ Thickness (in)
Derived from: 1 gallon covers ~100 sq ft at 1/16" (0.0625") thickness
Gallons = ⌈ Area ÷ Coverage per gallon × Waste Factor ⌉
Assumptions & References
- A standard 50 lb bag of concrete resurfacer (e.g., Quikrete Concrete Resurfacer) covers approximately 43 sq ft at 1/8" thickness, yielding a volume constant of 5.375 sq ft·in per bag. Coverage scales inversely with thickness.
- A standard liquid resurfacer covers approximately 100 sq ft per gallon at 1/16" thickness, yielding a volume constant of 6.25 sq ft·in per gallon.
- Typical resurfacing applications range from 1/16" to 1/2"; structural overlays may go up to 2".
- A 10% waste factor is recommended as a minimum for straightforward rectangular slabs; increase to 15–20% for irregular shapes, cutouts, or first-time applicators.
- Results are rounded up to the nearest whole unit to ensure sufficient material.
- Coverage rates may vary by manufacturer and product formulation. Always verify with the product data sheet (PDS) before purchasing.
- References: Quikrete Concrete Resurfacer Product Data Sheet; ASTM C387 (Standard Specification for Packaged, Dry, Combined Materials for Mortar and Concrete).