Concrete Resurfacing Calculator

These examples are illustrative. Always verify actual product yield and prep requirements.

The calculator estimates overlay volume, then converts volume into bags using product yield.

• Area: A = L × W (or user-entered total area)
• Thickness conversion: tft = tin / 12 or tft = (tmm / 1000) × 3.28084
• Base volume: V = A × tft
• Waste factor: Vtotal = V × (1 + w/100)
• Bags: B = ceil(Vtotal / Y), where Y is yield per bag (ft³)
• Water: Wqt = B × q, where q is water per bag (qt)

1. Select your unit system and how you want to enter area.
2. Enter slab dimensions or total area, then set overlay thickness.
3. Choose a mix preset or enter a custom yield and water rate.
4. Set a realistic waste factor for texture and cleanup losses.
5. Add optional bonding agent and sealer details if required.
6. Press Calculate to view results above the form.
7. Use the download buttons to export CSV or a simple PDF.

1) Scope the surface and traffic demands

Start by mapping each slab section and noting vehicle loads, turning zones, and drainage paths. Heavy turning, deicing salts, and frequent wetting increase wear and raise the importance of sound prep, bonding, and sealing. Record cracks, spalls, and delamination areas so you can patch before resurfacing. Moisture vapor and weak edges can telegraph through thin overlays, so treat them early.

2) Measure area with realistic boundaries

Use true resurfacing limits, not property lines. Subtract openings, drains, and expansion-joint gaps when they will not receive overlay. For irregular shapes, break the footprint into rectangles and triangles and sum the parts. A laser measure speeds takeoffs, and a quick sketch with dimensions helps verify totals during purchasing.

3) Choose thickness based on profile needs

Thin overlays often range from 1/16 to 1/8 inch, while cosmetic leveling can push thicker in low spots. Thickness changes drive volume linearly, so a small increase across a large slab can add several bags quickly.

4) Apply a waste factor that matches the finish

Waste covers bucket residue, texture broadcast, and edge loss. Smooth squeegee finishes may run 5–10%, while broom textures, stamping, and multiple batches can reach 12–15% or more, especially for small crews.

5) Translate volume to bags using yield

Each product publishes an approximate yield in cubic feet per bag. The calculator divides total volume by yield and rounds up. Rounding protects against mid‑pour shortages, which can cause cold joints and inconsistent color.

6) Plan water and batch sizes for consistency

Water demand is listed as quarts per bag. Multiply by bags to estimate gallons for the day and to size mixing stations. For quality, keep water within the recommended range and mix in repeatable batch counts. Standardize mixing time, rest time, and tool cleaning so every batch places and finishes the same way. Log temperature and wind.

7) Add primers, bonding agents, and sealers

Bonding agents are commonly estimated by square‑foot coverage per gallon, and sealers by coverage per coat. Two coats can improve stain resistance and reduce dusting. Costs vary widely, so enter local pricing for better budgeting.

8) Convert quantities into a job cost outlook

Materials typically include resurfacer, bonding agent, and optional sealer. Labor is often priced per square foot and depends on prep intensity, mobilization, and cure protection. Use the exports to share purchase lists and crew targets.

What thickness should I enter for a standard overlay?

Many resurfacing mixes are applied at 1/16 to 1/8 inch. Use the product range, then adjust for leveling low spots. If you plan a skim coat and spot fills, consider running two calculations and summing bags.

How does the calculator handle waste?

Waste increases total volume by the percentage you enter. It accounts for bucket residue, splatter, texture, and small overbuilds at edges. Use 5–10% for smooth work and 12–15% for textured finishes.

Where do I find yield per bag?

Check the manufacturer data sheet or bag label for yield in cubic feet. If only coverage is listed, convert using thickness. Enter the yield under Custom to match your exact product and reduce overbuying.

Do I always need a bonding agent?

Not always, but it is common on dense, smooth, or lightly profiled concrete. If the product requires a primer or bonding agent, include it. Also include it when resurfacing over repairs or when adhesion risk is higher.

How much water should I plan on site?

Multiply quarts per bag by the rounded bag count, then convert to gallons. Bring extra for cleanup and curing practices, but keep mix water within the specified range. Consistent batching improves color and finishing time.

Can I estimate sealer for multiple coats?

Yes. Turn sealer on, enter coverage per gallon, and set the number of coats. The calculator multiplies area by coats before dividing by coverage, then rounds up to a tenth of a gallon for purchasing.

Why does the bag count round up?

Running short mid‑application can create cold joints, color shifts, and rushed finishing. Rounding up provides a buffer for site variability and allows you to keep a spare bag for touchups and edge corrections.

• Surface prep drives performance: clean, sound, and properly profiled concrete matters.
• Thin overlays are sensitive to thickness variations; measure multiple locations.
• Temperature and wind affect working time; plan batch sizes accordingly.
• Always follow the product data sheet for mixing, application, and cure times.