Inputs
Unit system:
m²
At 1 mm thickness; numerically equals liters per bag.
L
Auto-syncs with coverage @ 1 mm above.
L
Optional; for total mix water planning.
%
Covers spillage, edge-dams, and product left in pails.
mm
Average extra thickness to model dips or slope.
$
Optional; shows estimated material spend.
Sections / Rooms
| Name | Area (m²)Area (ft²) | Avg thickness (mm)Avg thickness (in) | Volume (L) | Actions |
|---|---|---|---|---|
| Tip: For odd shapes, split into rectangles and sum. | ||||
This is the example data table; edit values or add rows.
Results
Total net volume
0.00 L
After slope allowance
+0 mm avg
Volume with waste
0.00 L
Overage
+0%
Exact bags
0.00
Order this many bags
0
Bag yield
13.0 L per bag
Total mix water
0.0 L
Estimated material cost
$0.00
Formula used
For each section i: Metric liters_i = area_m²_i × (thickness_mm_i + slope_allow_mm) Imperial liters_i = area_ft²_i × thickness_in_i × (28.316846592 / 12) Total_net_L = Σ liters_i Total_gross_L = Total_net_L × (1 + waste_% / 100) Bags_exact = Total_gross_L / bag_yield_L Bags_order = ceil(Bags_exact) Optional: Total_water_L = Bags_order × water_per_bag_L Cost_total = Bags_order × cost_per_bag
Note: 1 m² × 1 mm equals 1 liter. Rounding up avoids shortfall.
How to use
- Select your preferred unit system.
- Enter bag yield at 1 mm or liters per bag.
- Set waste percentage and slope/repair allowance, if needed.
- Add sections with area and average thickness.
- Review calculated bags, water, and cost.
- Download a CSV or generate a PDF report.
- Adjust inputs until the plan matches site conditions.
This tool aids planning only. Always follow manufacturer data sheets and onsite testing.
FAQs
Take measurements at several points using a straightedge and gauge. Average them, then add an allowance for dips or slope if present.
Commonly 5–10% for typical rooms. Increase for complex boundaries, edge dams, or difficult access. Use your site experience.
Yes, coverage at 1 mm in m² is numerically the same as liters of volume yield per bag: 1 m²·mm = 1 L.
Yes. Use “Add section” to list each area with its own average thickness. The tool sums all sections automatically.
Use the unit toggle. The table labels and slope allowance unit update accordingly while all internal volume math remains in liters.
Partial bags are not practical to purchase. Rounding up avoids running short mid‑pour and allows for mixing losses.
No. Always consult the specific product’s technical documentation for exact yield, water ratios, substrate prep, and curing requirements.
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