Inputs
White theme
ft
ft
ft²
Leave zero to auto-calc from length × width.
100% solids means dry ≈ wet thickness.
If provided, coats multiply the requirement.
0 ft²
Total area
0.00 gal
Total mixed epoxy required
0 kits
Recommended kits (selected size)
0 ft²/kit
Coverage per kit at entered build
Note: Results are estimates. Always verify with manufacturer data sheets and jobsite conditions.
Quick Reference
Core relationship: Gallons = Area(ft²) × WFT(mils) ÷ 1604. With solids by volume S, dry-to-wet: WFT = DFT ÷ (S/100).
| Scenario | Area | Coats | DFT/coat | Solids | Approx Kits* |
|---|---|---|---|---|---|
| Single-car garage | 12×22 ft | 1 | 10 mil | 100% | ~2 × 2-gal |
| Two-car garage | 20×24 ft | 2 | 12 mil | 100% | ~6 × 2-gal |
| Basement room | 30×15 ft | 1 | 8 mil | 80% | ~2 × 2-gal |
*Illustrative only. Your surface profile and waste will change requirements.
Results Table
| # | Area (ft²) | Coats | DFT/coat (mil) | Solids (%) | Waste+Adj (%) | Kit Size (gal) | Gallons | Kits | Coverage/Kit (ft²) | Method | Timestamp |
|---|
Formula Used
The calculator follows coating-industry geometry and film-build relationships.
- Area: computed from length × width, converted to square feet if needed.
- Dry vs Wet: Dry Film Thickness (DFT) relates to Wet Film Thickness (WFT) by solids by volume S:
WFT = DFT ÷ (S/100). - Volume constant: One US gallon equals 231 in³. At 1 mil (0.001 in) thickness, coverage is ~
1604 ft² per gallon. - Per-coat volume:
Gallons_per_coat = Area(ft²) × WFT(mils) ÷ 1604. - Total volume: Multiply by coats, then adjust for waste, porosity, and broadcast losses.
- Kits:
Kits = ceil(Total_gallons ÷ Kit_size_gal). - Coverage per kit:
Coverage_kit = Kit_size_gal × 1604 ÷ Total_WFT(mils). - Alternate path: If a manufacturer rating (ft²/kit/coat) is supplied, total kits =
ceil( Area × (1+adj) × Coats ÷ Rating ).
How to Use
- Select your preferred units and enter dimensions or area directly.
- Enter coats, desired dry mils per coat, and solids by volume.
- Add waste/overage plus surface profile and any broadcast loss.
- Choose a kit size. Optionally, enable manufacturer rating and fill it in.
- Click Calculate to see gallons, kits, and coverage per kit.
- Click Add to Results Table to log the scenario.
- Export the table using CSV or PDF for purchasing and submittals.
FAQs
They are engineering estimates using volume constants and film-build math. Surface profile, ambient conditions, absorption, and application technique can significantly change real-world coverage.
Enter dry mils per coat. The tool converts to wet mils automatically using solids by volume so you can compare to wet-film gauges and datasheets.
Check the product technical data sheet. Many high-build epoxies are near 100% solids, while primers or urethanes may be lower. Using the correct value improves accuracy.
Broadcast systems can require additional resin to encapsulate or backroll aggregates. Use the broadcast loss percentage to approximate extra volume for those builds.
Yes. Enable the manufacturer rating option and enter the quoted ft² per kit per coat. The tool will multiply by coats and compare to your adjusted area.
Many epoxy systems are sold as mixed kits labeled by total volume. Selecting kit size lets the calculator convert required gallons to whole-kit counts.
They don’t change the geometry but can affect absorption, sag, cure, and handling losses. Always follow product environmental limits and adjust waste accordingly.