This calculator is designed for roll-applied floor coating systems whose product data sheets state coverage per litre or per US gallon. It sizes primer, epoxy and topcoat as separate products, then rounds each one to full kits.
Start with the coating stack, not the kit label
A floor may receive one epoxy coat, two epoxy coats, primer plus epoxy, or a three-product system with a separate topcoat. Selecting the stack first prevents the coverage and pack size of one product from being incorrectly applied to every layer.
- One epoxy coat: one purchasing line for the base coating.
- Two epoxy coats: the same floor area is counted twice for the epoxy product.
- Primer plus epoxy: primer and base coat are calculated and rounded separately.
- Full system: primer, epoxy base coat and topcoat each receive their own coverage, kit size, surplus and optional cost.
The quick form asks for only two decisions
What stays on the main screen
| Input | Why it is required | What is kept in Advanced settings |
|---|---|---|
| Floor area | Sets the net area receiving each selected coat. | Surface profile, allowance and all product specifications. |
| Coating system | Determines which layers and how many coats are active. | Coverage, mixed kit volume, prices and currency. |
Use the defaults for a rough early estimate. Before ordering, open Advanced settings and replace every active coverage and kit-volume value with the figures for the exact regional product and pack size you will buy.
Read three different numbers correctly
Product-sheet values used by the calculator
| Value | Meaning | Common mistake |
|---|---|---|
| Coverage | Area covered by one unit of mixed volume for one coat. | Using a maximum marketing area that assumes a smoother or less porous surface. |
| Mixed kit volume | Combined usable volume after the supplied resin and hardener are mixed. | Entering only Part A, only Part B, or the shipping weight of the pack. |
| Number of coats | How many times the floor area is covered by that product. | Treating primer and topcoat as though they were extra coats from the epoxy kit. |
A kit may also be described as a pack, unit or set. Enter the combined mixed volume, not the container count and not the ratio between components.
Surface profile is handled separately from the allowance
The substrate selector applies a practical purchasing adjustment before the general allowance is added. Standard prepared concrete uses the entered coverage unchanged; porous and rough surfaces increase the estimated material demand because actual uptake and surface profile can reduce practical coverage.
Adjustments used in the estimate
| Selected condition | Profile adjustment | Separate default allowance |
|---|---|---|
| Standard prepared concrete | 0% | 10% |
| Porous or highly absorbent | +15% | 10% |
| Rough, profiled or uneven | +25% | 10% |
These adjustments are estimating aids, not acceptance criteria for the substrate. A rough, weak, contaminated or damp floor may need repair or may be unsuitable for the selected coating regardless of the calculated quantity.
How the result becomes a purchasing list
- The floor area is multiplied by the number of coats assigned to the layer.
- The selected substrate adjustment and allowance are applied.
- Adjusted application area is divided by the product coverage to obtain mixed volume.
- Mixed volume is divided by kit volume and rounded up to a whole kit.
- Purchased volume and estimated surplus are reported separately for primer, epoxy and topcoat.
The total-kit figure is useful for handling and budgeting, but it combines different products. Use the detailed table as the actual shopping list because one spare primer kit cannot replace a missing epoxy or topcoat kit.
Cost is optional and intentionally incomplete
Turn on cost calculation only when current kit prices are available. The total includes the full kits for active layers whose prices have been entered. Blank prices remain excluded, and the result explains whether all or only some layers are priced.
- Included when priced: primer kits, epoxy kits and topcoat kits.
- Not included: substrate repair, grinding, cleaning chemicals and moisture mitigation.
- Not included: flakes, aggregate, anti-slip media, tools, labour, delivery, taxes or waste disposal.
Do not let the quantity calculation set the work sequence
Checks that remain outside the calculator
| Before coating | During mixing and application | Between coats and before service |
|---|---|---|
| Concrete age, moisture, cleanliness, strength and surface profile | Mix ratio, induction time, pot life, batch size and application temperature | Recoat window, cure time, ventilation, traffic loading and chemical exposure |
| Adhesion of any existing coating and compatibility of repairs | Safe handling, PPE and the manufacturer’s application method | Compatibility of primer, epoxy and topcoat, including UV suitability where relevant |
Do not use this coverage-based calculator for self-levelling resin floors, epoxy mortar, broadcast aggregate systems or other products specified by thickness and mass unless their manufacturer also provides a compatible area-per-volume coverage figure.
What the estimate can and cannot confirm
The result is a preliminary material and packaging estimate. It does not approve the substrate, choose a coating chemistry, verify component ratios, predict adhesion or cure, or replace the current product data sheet, safety data sheet and project specification.