Epoxy Coverage Calculator
Adjust the parameters below to compute materials and estimate project costs.
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Breakdown Details
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Guidelines & Field Recommendations
• 10 Mils: Roll-on protective sealer.
• 20 Mils: Standard garage floor system.
• 1/8 inch (125 Mils): Thick countertop casting or self-leveling floor.
Calculation Formulas & Steps
1 Gallon of 100% solid epoxy covers 1,604 sq ft at 1 mil thickness. Gallons needed = (Area × Thickness in Mils) ÷ 1,604.
Worked Example (Step-by-Step Math)
Multiply length by width.
20 ft × 10 ft = 200 sq ftUsing the 1604 constant for solids at 10 mil thickness.
Gallons = (200 sq ft × 10 mils) ÷ 1,604 = 1.25 GallonsEpoxy flows and drips. Order a surplus.
1.25 × 1.10 = 1.37 ≈ 1.5 GallonsEpoxy Thickness Conversion Table
Understanding mil thicknesses.
| Project Condition | Reference Metric |
|---|---|
| 10 Mils | 0.010 inch (160 sq ft coverage per gallon) |
| 20 Mils | 0.020 inch (80 sq ft coverage per gallon) |
| 1/8 inch (125 mils) | 0.125 inch (13 sq ft coverage per gallon) |
Critical Mistakes to Avoid
- !Mistake 1: Not mixing Part A and Part B thoroughly. Inadequately mixed epoxy leaves sticky, uncured spots that never harden.
- !Mistake 2: Applying epoxy to a damp concrete floor, trapping moisture and causing bubbles.
Frequently Asked Questions
How much coverage does a gallon of epoxy provide at various mil thicknesses?
A standard garage floor paint kit has a thickness of 10 to 20 mils. One gallon of 100% solids epoxy yields 1,604 square feet at 1 mil thickness. Therefore, at 20 mils, one gallon covers exactly 80.2 square feet.
What is epoxy resin pot life and how long does it last?
Pot life is the length of time you can work with mixed epoxy before it hardens in the bucket. Depending on temperature and chemistry, pot life ranges from 15 to 45 minutes. Mix only what you can spread immediately.
How long does a poured epoxy floor take to dry and cure fully?
Epoxy cures chemically. You can walk on a new epoxy floor after 24 hours (72°F/22°C), but keep heavy vehicles parked off the floor for a full 3 to 5 days to prevent hot tire pickup peeling.
What is "hot tire pickup" epoxy failure and how do I prevent it?
This occurs when hot car tires park on cheap or uncured epoxy. The heat and weight soften the coating, causing it to bond to the tire tread and peel off when the car drives away. Prep concrete properly and use 100% solids epoxy to avoid this.
Do I need to acid etch concrete before applying epoxy resin?
Yes. Epoxy will not stick to smooth concrete. Acid etching opens the concrete pores, creating a rough texture (like fine sandpaper) that allows the epoxy resin to grip and bond permanently.
What is a "mil" measurement in paint and epoxy coating?
A unit of measurement equal to 1/1,000 of an inch (0.001"). It is the industry standard for specifying film and coating thickness.
What is the difference between 100% solids epoxy and water-based epoxy?
100% solids epoxy has no solvents or water to evaporate, meaning it cures to the exact thickness it was poured. Water-based epoxy contains water carriers that evaporate, leaving a much thinner layer.
Complete Tools Checklist
- Epoxy Roller Cover
- Spiked Shoes
- Mixing Paddle & Drill
- Notched Squeegee
- Gloves