Flooring
Epoxy & PU Flooring Calculator
Size an epoxy or polyurethane floor the way it is actually specified — by film. Enter the area and the dry-film thickness, or the build depth for a self-leveller or screed, and get litres, kilos and whole kits to order, with the maker’s own published coverage shown alongside.
Your floor
Size it by film, the way it is specified — not by a one-size coverage number.
m²
µm
%
mm
kg/L
What this assumes
- Coating litres come from a standard engineering method — theoretical coverage (m²/L) = volume solids % × 10 ÷ dry-film thickness in microns — using the film and solids you enter. Those are your inputs, not a published figure for the product, so the result is labelled indicative: confirm it against the current datasheet and a site trial.
- Self-levelling and screed quantities are volumetric: area × thickness (mm) gives litres directly, and litres × wet density gives kilos. Epoxy self-levellers run about 1.5 kg/L; aggregate-filled trowel screeds are heavier — raise the density for those. The result is reported by mass because that is how the material is batched.
- Theoretical film assumes an even coat on a sound, primed, level substrate. Real floors are none of those, so a wastage allowance is added and stated. 8% suits roller and squeegee on a prepared slab; raise it for spray, rough or profiled concrete, and for a self-leveller flooding an out-of-level floor — which can lift consumption well beyond the nominal.
- Where the product you pick carries a published coverage or consumption figure, the exact sentence is shown with every result and tagged as a manufacturer figure — or as indicative where the maker themselves marked it that way. Where none is published, the tool still sizes the job from your film and says the number is indicative rather than inventing a published one.
- Two-part epoxy and PU floors are supplied as matched Part A + Part B kits. Pack counts round up to whole kits over the product’s own pack sizes — do not order base and hardener separately. The A:B split shown is for reference only.
- Primer is a separate product with its own rate (~0.15–0.20 kg/m²). Its figure is shown as an add-on line to order and cost on its own; it is not folded into the floor quantity.
Where these figures come from. Coverage, consumption, pack sizes and coat counts are parsed from the technical data published for each flooring product and are shown verbatim with every result. The dry-film-thickness method, the volume-solids and density defaults follow standard TDS conventions and ASTM practice for solvent-free and solvent-borne resin systems; they are engineering defaults you can edit, not a manufacturer’s value for the named product. Where a maker declines to publish a coverage figure — some texture- and thickness-dependent systems do — the tool sizes the job from your inputs and labels the number indicative rather than interpolating a published one.
Questions
How do you turn dry-film thickness into litres of epoxy?
Theoretical coverage in m² per litre is volume solids % × 10 ÷ the dry-film thickness in microns. At 100% solids and a 300-micron film that is 3.33 m²/L, so 100 m² needs about 30 litres before wastage. Lower the solids or raise the film and it climbs. The tool does this for the figures you enter and then adds your wastage allowance.
What volume solids should I use?
Use the product’s datasheet. Solvent-free epoxy coatings and self-levellers are near 100% solids; solvent-borne coatings are typically 50–60%; water-borne and PU systems vary widely. The tool defaults to 55% for a coating and 100% for a self-leveller as starting points, but the field is yours to edit to the actual TDS value.
Coating, self-levelling or screed — does it change the maths?
Yes. A coating is sized by dry-film thickness and volume solids — a thin volumetric film. A self-leveller or trowel screed is sized by build depth: area × thickness in mm gives litres, and litres × wet density gives the kilos you actually batch. Pick the system and the tool switches method and inputs to match.
Why is the result labelled indicative and not a manufacturer figure?
Because the dry-film thickness and volume solids are values you enter, not something the maker published for that exact spec. Where the product does carry a published coverage or consumption figure, the tool shows that sentence separately and verbatim, tagged as a manufacturer figure, so you can compare the two.
How much should I allow for wastage?
8% is reasonable for roller and squeegee application on a prepared slab. Allow 12–15% for spray or for rough, open or profiled concrete. A self-leveller poured over an out-of-level floor can consume far more than the nominal where it fills the low spots — survey the levels before you commit to a quantity.
Do I order the base and hardener separately?
No. Two-part epoxy and PU floors ship as matched Part A + Part B kits mixed in a fixed ratio, so the tool rounds up to whole kits over the product’s pack sizes. The A:B split it shows is only to tell you how much of each part is in the mix, not a shopping list — buying base and hardener apart risks an off-ratio, uncured floor.
Other tools
Coverage & quantityLitres, kilos and packs for a real areaWaterproofing materialMembrane kg and tubs for terrace, tank & basementTile adhesiveBags of adhesive by tile size and trowel notchGrout consumptionTile & epoxy grout kg from joint geometryConcrete volume & materialsCement, sand & aggregate for any memberAdmixture dosageLitres per m³, per batch and drums to stockWaterproofing selectorPick the right build-up by zone & exposure