# Epoxy Floor Coating Calculator: Litres, Kilograms and Kits

> An epoxy or PU floor coating quantity follows from the floor area, the thickness of each coat and the product's volume solids: litres = area in m² × dry thickness in mm ÷ volume solids. One square metre at 1 mm of a 100% solids product takes one litre. Kilograms are litres multiplied by the mixed density.

## What it calculates

For an epoxy or PU floor coating, the calculator gives:

- the **coating quantity** in litres and kilograms, for the coats and thickness chosen;
- the number of **kits** to order, in litres or kilograms;
- the **primer** quantity and packs;
- the **wet film per coat** and the **consumption per coat** in kg/m², to compare with the
  product data sheet.

## Inputs

**Floor area** is in square feet or square metres, as chosen in **Area unit**.

**System** chooses a thin roller-applied coat or a self-levelling coat. It fills starting
figures for the coats, thickness, volume solids and density, all of which you can change.

**Number of coats** counts body coats only; the primer is separate.

**Dry film or layer thickness per coat** is in millimetres. Data sheets often give film
thickness in microns: 150 µm is 0.15 mm.

The **assumptions** panel holds the volume solids, mixed density, an optional data-sheet
consumption, primer coverage, kit and pack sizes and the wastage allowance.

## Method

The core relation is that one square metre at 1 mm thickness is one litre:

1. Area in m² = sq ft × 0.0929.
2. Litres = area × dry thickness per coat × coats ÷ volume solids × (1 + wastage).
3. Kilograms = litres × mixed density.
4. Kits = litres (or kilograms) ÷ kit size, rounded up.
5. Primer = area ÷ primer coverage × (1 + wastage).

If a data-sheet consumption is entered, kilograms = area × consumption × coats ×
(1 + wastage), and litres = kilograms ÷ density.

Volume solids is measured to methods such as **ISO 3233-1** and density to methods such as
**ISO 2811-1**; the data sheet states the figure and method. Resin floor screeds are
classified under **EN 13813**.

## Assumptions

| Assumption | Default | Notes |
| --- | --- | --- |
| Thin coat | 2 coats × 0.15 mm dry | Illustrative; use the system specification |
| Thin coat volume solids | 80% | Replace with your product's data sheet |
| Thin coat density | 1.3 kg/L | Replace with your product's data sheet |
| Self-levelling | 1 coat × 2 mm | Illustrative; use the system specification |
| Self-levelling volume solids | 100% | Replace with your product's data sheet |
| Self-levelling density | 1.6 kg/L | Replace with your product's data sheet |
| Primer coverage | 5 m² a litre | Replace with your primer's data sheet; porous concrete takes more |
| Kit and primer pack size | 10 L | Replace with the pack sizes supplied |
| Wastage | 10% | Material left in kits and tools, surface roughness and porosity |

## Limitations

- **Surface preparation is not included.** Grinding or shot-blasting, crack and joint
  repair, moisture testing and any levelling screed are separate items.
- **Broadcast and filled systems** such as sand-broadcast or quartz-filled floors use
  aggregate and resin in proportions the manufacturer sets; use its consumption figures.
- **Porous or rough substrates** take more primer and more of the first coat than a smooth
  floor. Raise the wastage or primer quantity accordingly.
- **Skirting coves, upstands, drains and trenches** add area that is not in a flat floor
  measurement.
- **Performance is not checked.** Thickness, chemical and abrasion resistance and slip
  resistance belong to the system specification, not to this calculation.

## Worked example

A 1,000 sq ft floor with the thin-coat system: two coats of 0.15 mm dry at 80% volume
solids, density 1.3 kg/L, 10 L kits, primer at 5 m² a litre in 10 L packs and 10% wastage:

| Step | Calculation | Result |
| --- | --- | --- |
| Area | 1,000 × 0.0929 | 92.9 m² |
| Wet film per coat | 0.15 ÷ 0.80 | 0.1875 mm |
| Coating before wastage | 92.9 × 0.15 × 2 ÷ 0.80 | 34.84 L |
| Coating with wastage | 34.84 × 1.10 | 38.32 L |
| Mass | 38.32 × 1.3 | 49.82 kg |
| Kits | 38.32 ÷ 10, rounded up | 4 |
| Primer | 92.9 ÷ 5 × 1.10 | 20.44 L, 3 packs |

The floor needs about **38.3 litres (49.8 kg) of coating in 4 kits, and 20.4 litres of
primer**. Each coat works out at about 0.244 kg/m², the figure to compare with the data
sheet. Switching to the self-levelling system at 2 mm, 100% solids and 1.6 kg/L gives
204.39 litres, or 327.02 kg, for the same floor.

## How engineers use it

On an industrial or commercial floor, the flooring specification names the system: primer,
any scratch or levelling coat, body coats or self-levelling layer, broadcast and top coat,
each with a thickness or consumption. Quantities are taken off for each layer from the
manufacturer's figures for the substrate and finish, and the contractor plans kits so each
mix can be laid within its working time.

## When a professional design must replace it

Use the calculator to estimate material or check a supplier's quantities for a simple floor.
Replace it with the manufacturer's or flooring designer's system specification before
ordering, and wherever the floor carries forklifts or heavy loads, chemicals, hot washing,
wet processes or food and pharmaceutical hygiene requirements, or sits on a slab with
moisture or cracking problems. The system specification decides the build-up, not a rule
of thumb.

## Frequently asked questions

### How much epoxy do I need per square metre?

One square metre at 1 mm thickness of a 100% solids product takes 1 litre. For a thinner coat or a product with less than 100% solids, multiply the dry thickness in mm by the area and divide by the volume solids. A 0.15 mm dry coat of an 80% solids product takes about 0.19 litres a square metre.

### What is volume solids and why does it matter?

Volume solids is the share of the wet coating that stays on the floor once any solvent or water has evaporated. A product at 80% volume solids must be applied 1.25 times thicker wet to reach the specified dry thickness, so it needs 25% more litres than a 100% solids product. The figure is on the product data sheet.

### How much epoxy is needed for a 1,000 sq ft floor?

With two thin coats of 0.15 mm dry each at 80% volume solids and 10% wastage, about 38.3 litres (49.8 kg at 1.3 kg/L), or 4 kits of 10 litres. A primer at 5 m² a litre adds about 20.4 litres. A 2 mm self-levelling coat of a 100% solids product needs about 204 litres for the same floor.

### My data sheet gives consumption in kg per square metre. Can I use that?

Yes. Enter the consumption in kg/m² a coat and the calculator uses it instead of thickness and volume solids, converting to litres with the density. Manufacturers often quote self-levelling and trowelled PU systems this way, sometimes per mm of thickness, so multiply by the thickness first if so.

### What thickness should I use?

Use the thickness in the system specification for the floor. It depends on the use, the traffic, chemical exposure and the substrate, and the manufacturer or flooring designer sets it. This calculator converts a chosen thickness into quantities; it does not recommend one or check a floor's performance.

## Sources

- [ISO 3233-1](https://www.iso.org/standards.html) — Paints and varnishes — determination of the percentage volume of non-volatile matter
- [ISO 2811-1](https://www.iso.org/standards.html) — Paints and varnishes — determination of density — pycnometer method
- [EN 13813](https://standards.cencenelec.eu/ords/f?p=CEN:105) — Screed material and floor screeds — screed material — properties and requirements

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Source: https://hagerstone.com/calculators/epoxy-floor-coating-calculator