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Calcimator

Safety Surfacing Calculator

Calculate volume, weight, and cost of playground safety surfacing materials for a given fall height and area per CPSC/ASTM F1292.

Inputs

%

Results

Install depth with compaction (in)

15

Estimated material cost ($)

$1,250.00

≈ 10 pairs of sneakers

Minimum depth (in)12
Volume needed (cu ft)500
Volume needed (cu yd)18.52
Weight (tons)3.75
Dump truck loads2
How to Use This Calculator
  1. Enter Surfacing area (sq ft), Critical fall height (ft), and Material type.
  2. Set Compaction allowance (%).
  3. Review Install depth with compaction (in) and Estimated material cost ($) ($).
  4. Use Minimum depth (in) and Volume needed (cu ft) to inform your decision.

How the result changes with Compaction allowance (%)

Compaction allowance (%)Install depth with compaction (in)Estimated material cost ($)
512.6$1,050.00
1814.2$1,183.33
3316$1,333.33
4517.4$1,450.00

What each input means

Surfacing area (sq ft)
Total area requiring protective surfacing (use zone minus equipment footprint).
Critical fall height (ft)
Height of the highest accessible part of equipment. CPSC max for most loose fills is 12 ft.
Material type
0 = Engineered Wood Fiber, 1 = Rubber Mulch, 2 = Pea Gravel, 3 = Poured-in-Place Rubber, 4 = Rubber Tiles.
Compaction allowance (%)
Extra depth to add for settling/compaction. 25% typical for wood fiber; 0% for unitary surfaces.

What each result means

Minimum depth (in)
CPSC minimum loose-fill depth for this fall height.
Install depth with compaction (in)
Depth to install so settled material still meets minimum.
Volume needed (cu ft)
Total volume of surfacing material at install depth.
Volume needed (cu yd)
Volume in cubic yards for ordering.
Weight (tons)
Approximate weight for delivery planning.
Estimated material cost ($)
Material-only cost estimate at typical market rates.
Dump truck loads
Estimated delivery loads (10 cu yd per truck).

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Surfacing area (sq ft) = 400, Critical fall height (ft) = 8, Material type = 0, Compaction allowance (%) = 25 = 4 input(s) provided
  2. Calculate Install depth with compaction
    Install depth with compaction
    15 = 15
  3. Calculate Estimated material cost
    1250 = $1,250
  4. Calculate Minimum depth
    Minimum depth
    12 = 12
  5. Calculate Volume needed
    Volume needed
    500 = 500

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators.

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