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Epoxy floor coating calculator
Work out how many kits of epoxy or PU you need for a self-smoothing, screed or roller-applied system. Enter the floor area and total thickness, then check the density and kit size against your data sheet.
How the calculation works
Resin systems are priced by thickness, so the calculator starts with volume. One square metre at one millimetre thick is one litre.
Mass (kg) = volume × mixed density (kg/L) × (1 + waste%)
Kits = round up (mass ÷ kit size)
Mixed density is on the technical data sheet. Unfilled clear epoxy sits near 1.1 kg/L. Self-smoothing systems with filler are usually 1.4 to 1.7 kg/L. Heavy-duty screeds run higher.
Waste covers mixing pots, edges, rollers and the surface profile soaking up material. 10% suits most jobs. Use 15% on rough, shot-blasted or open-textured slabs.
Site tips
- Prime porous concrete. Skipping primer causes pinholes and air bubbles in the body coat.
- Moisture-test the slab first. Most epoxy data sheets set a limit on slab moisture.
- Add 5–10% thickness on uneven floors. The floor fills low spots before it reaches your design thickness.
Questions
How much epoxy do I need per square metre?
For a 2 mm self-smoothing system at 1.6 kg/L you need about 3.2 kg per m² before waste. A thin roller coat at 0.3 mm uses roughly 0.4 to 0.5 kg per m² per coat.
Does this work for polyurethane and PU-cement floors?
Yes. Enter the density and kit size from the PU data sheet. PU-cement screeds are heavier, often around 2.0 kg/L.
Should I include the primer in the thickness?
No. Primer soaks into the concrete and is calculated separately from its coverage rate in m² per kg.