Calculator Inputs
Formula Used
Area: length × width, or direct area entry.
Effective coverage: reference coverage × reference thickness ÷ selected thickness.
Bags before waste: total area ÷ effective coverage.
Bags to order: ceiling of bags before waste × (1 + waste percentage ÷ 100).
Material cost: bags to order × price per bag.
Total estimate: material cost + primer cost + labor cost + delivery fee + tax.
How to Use This Calculator
- Choose whether to use length and width or direct floor area.
- Enter the measured floor size and select the correct unit.
- Enter average pour thickness from your floor survey.
- Keep the default reference coverage, or enter your own data sheet value.
- Add waste, bag price, primer, labor, delivery, and tax values.
- Press the calculate button to view results above the form.
- Use the CSV or PDF buttons to save the estimate.
Example Data Table
| Room | Area | Thickness | Waste | Estimated Bags | Use Case |
|---|---|---|---|---|---|
| Small office | 180 sq ft | 1/8 in | 10% | 4 bags | Light smoothing |
| Retail room | 300 sq ft | 1/4 in | 10% | 11 bags | Standard leveling |
| Large hall | 650 sq ft | 3/8 in | 12% | 28 bags | Deeper correction |
ARDEX K 15 Coverage Planning Guide
Why Coverage Planning Matters
ARDEX K 15 projects need careful material planning. A self-leveling pour can move fast. Shortage during placement can create cold joints, delays, and uneven transitions. Too much material also raises project cost. This calculator helps estimate bags before work starts. It uses area, average thickness, waste, primer, labor, and tax values. The result gives a clearer buying number for site planning.
How Thickness Changes Bags
Coverage changes directly with depth. A thinner layer covers more floor area. A thicker layer covers less floor area. The calculator starts from a reference coverage value. Then it scales that value by the chosen installation thickness. This makes the estimate flexible for skim areas, leveling work, and deeper low spots. Always measure the floor in several places. Use an average thickness that represents the whole pour.
Planning Waste and Cost
Waste is important on real jobs. Material can be lost in buckets, pumps, edges, and uneven substrate areas. Small rooms may need a higher waste factor. Large open pours may need less. The tool adds your waste percentage before rounding bags upward. It also adds primer, labor, delivery, and tax when you enter those values. This gives a fuller view of project cost, not only bag count.
Better Site Decisions
The graph shows how bag demand rises as thickness increases. It is useful when comparing a light smoothing pass with a deeper leveling pour. Use it before ordering, scheduling labor, or arranging delivery. The CSV report can support quick estimating records. The PDF report can be saved with job notes or shared with a client. Treat all outputs as planning estimates. Final needs depend on surface profile, substrate porosity, mixing control, temperature, and installer method.
Checks Before Ordering
Confirm the selected product data sheet for your region. Bag size, water demand, drying time, and allowed depth can vary by market. Check substrate soundness before estimating. Remove loose material, oils, dust, and weak patches. Prime as directed by the manufacturer. Keep extra bags ready when floor variation is uncertain. Never stretch coverage by adding extra water. Overwatering can reduce strength and affect the finished floor. Use test pours for unusual conditions.
FAQs
1. What does this calculator estimate?
It estimates floor area, effective coverage, required bags, waste, primer amount, mix water, labor, tax, and total project cost for planning ARDEX K 15 work.
2. Why does thickness change the bag count?
Coverage is depth based. A thicker pour uses more material per square foot. A thinner pour uses less material per square foot.
3. Should I include waste?
Yes. Waste covers bucket loss, uneven floors, edge buildup, and jobsite variation. Many projects use 5% to 15% waste.
4. Can I change the reference coverage?
Yes. Enter the coverage shown on your current product data sheet, distributor sheet, or project specification for better local accuracy.
5. Does this replace manufacturer instructions?
No. It is an estimating tool only. Always follow the current technical data sheet, substrate preparation rules, primer guidance, and installer judgment.
6. Why is primer included?
Primer is often part of self-leveling underlayment work. It helps estimate a fuller project cost, not only the bag purchase cost.
7. What if the floor has deep low spots?
Measure several points and use a realistic average thickness. For very deep areas, check product limits and aggregate extension requirements before ordering.
8. Why are bags rounded up?
Bags are whole purchase units. The calculator rounds upward so the estimate does not understate the amount needed for the pour.