Enter inputs
Use consistent units. The calculator recommends spacing that stays within your limit.
Formula used
This calculator converts all inputs to inches internally, then converts results back to your chosen unit.
- InnerLength = Length − 2 × EdgeOffset
- IntervalsX = ceil(InnerLength / MaxSpacing)
- SpacingX = InnerLength / IntervalsX (ensures SpacingX ≤ MaxSpacing)
- NodesX = IntervalsX + 1 (same for Y direction)
- GridCount = NodesX × NodesY
- PerimeterCount = 2×NodesX + 2×(NodesY−2) (when both sides have ≥2 nodes)
- WithWaste = ceil(Count × (1 + Waste%/100))
- LoadRequired = ceil(TotalLoad / CapacityPerPedestal) (optional quick check)
How to use this calculator
- Select the unit you will use for size inputs.
- Enter your platform length and width.
- Set a maximum spacing that matches your surface needs.
- Add an edge offset for perimeter clearance and framing.
- Pick grid or staggered layout, then choose support mode.
- Optionally add a waste percent and a simple load check.
- Press calculate to see spacing, intervals, and totals.
- Use the CSV or PDF buttons to save your results.
Example data table
| Unit | Length | Width | Max spacing | Edge offset | Layout | Mode | Recommended spacing (L × W) | Pedestals with 5% waste |
|---|---|---|---|---|---|---|---|---|
| ft | 12 | 10 | 2 | 0.25 | Grid | Full | 1.917 × 1.900 ft | 42 |
| ft | 16 | 12 | 2 | 0.5 | Staggered | Full | 1.875 × 1.833 ft | 68 |
| m | 3.6 | 2.4 | 0.6 | 0.08 | Grid | Perimeter | 0.586 × 0.560 m | 20 |
Examples are illustrative. Actual needs vary with surface type, framing, and local conditions.