Calculator Inputs
Example Data Table
Sample planning scenarios| Scenario | Floor Size | Coats | Coverage Rate | Waste | Kit Size | Estimated Kits |
|---|---|---|---|---|---|---|
| Smooth garage slab | 24 × 24 ft | 2 | 180 ft²/gal | 8% | 3 gal | 3 kits |
| Lightly textured workshop | 30 × 20 ft | 2 | 160 ft²/gal | 10% | 3 gal | 4 kits |
| Rough commercial bay | 40 × 30 ft | 3 | 150 ft²/gal | 12% | 5 gal | 7 kits |
These rows are examples only. Actual coverage changes with solids content, film thickness, substrate preparation, porosity, roller losses, and finish texture.
Formula Used
Area = Length × Width
Square feet = Square meters × 10.7639
Adjusted Area = Base Area × Surface Profile Factor × Absorption Factor
Base Epoxy Gallons = (Adjusted Area × Number of Coats) ÷ Epoxy Coverage Rate
Final Epoxy Gallons = Base Epoxy Gallons × (1 + Waste %) × (1 + Reserve %)
Kits Needed = Ceiling(Final Epoxy Gallons ÷ Kit Size)
Primer Gallons = (Base Area ÷ Primer Coverage) × (1 + Waste %)
Topcoat Gallons = (Base Area ÷ Topcoat Coverage) × (1 + Waste %)
Total Cost = (Epoxy Kits × Price per Kit) + (Primer Gallons × Primer Price) + (Topcoat Gallons × Topcoat Price)
How to Use This Calculator
- Enter the project name and the floor dimensions.
- Select feet or meters for your floor measurements.
- Enter epoxy coats and the published coverage rate.
- Set kit size and cost using the product you plan to buy.
- Add waste and reserve percentages for realistic ordering.
- Choose the surface texture and substrate absorption level.
- Include primer and topcoat if your system uses them.
- Submit the form to show results above the form.
- Review the summary, cost table, and Plotly chart.
- Download the result set as CSV or PDF.
Frequently Asked Questions
1) How much area can one epoxy kit usually cover?
Coverage depends on kit volume, coat count, solids content, and floor condition. This calculator converts those assumptions into an estimated coverage area for one kit under your selected job conditions.
2) Why does a rough surface increase material demand?
Rough or porous concrete absorbs more resin and creates more surface area. That usually lowers spread rate, increases roller loss, and pushes total gallons above the theoretical flat-surface estimate.
3) Should I always include primer in my estimate?
Not always, but many systems perform better with primer. It can improve adhesion, help seal porous concrete, and reduce pinholes. Use the manufacturer specification for your exact coating system.
4) Why is waste allowance important for coating jobs?
Waste covers tray losses, mixing residue, edge work, touch-ups, and uneven absorption. Without it, the order may look accurate on paper yet still leave the crew short during application.
5) Can I enter metric dimensions?
Yes. The calculator accepts meters for length and width, then converts area internally. Coverage inputs still use square feet per gallon, which matches many coating product sheets.
6) Is this useful for flake, quartz, or metallic systems?
Yes, as a planning tool. Decorative systems often need different build coats, clear coats, and extra waste. Adjust the inputs conservatively and confirm exact product usage with the supplier data.
7) Why does the calculator round kits upward?
Coating kits are purchased as full units. Even if the estimate needs only part of the last kit, you still must buy the next whole kit to complete the project safely.
8) Does this replace the manufacturer technical sheet?
No. It is a job-planning estimate. Final ordering should still follow the technical data sheet, coverage notes, mixing instructions, recoat windows, and substrate preparation requirements for the selected product.