Landscaping · updated 2026
Playground Mulch Calculator
Playground mulch isn't decoration — it's fall protection, and depth is a safety spec, not a look. This playground mulch calculator takes your play area's dimensions and safety depth and returns cubic yards and 2-cu-ft bag counts, with 2026 costs. Nine inches covers fall heights up to ~7 ft; twelve inches covers up to ~10 ft.
9 in for fall heights up to ~7 ft; 12 in for up to ~10 ft
Show the math
Volume = 20 × 20 × (9 ÷ 12) = 300.0 cu ft
Cubic yards = 300.0 ÷ 27 = 11.11
Bags = ⌈300.0 ÷ 2⌉ = 150.0 (2-cu-ft bags)
Cost = 11.11 × $35–$55/yd (bulk delivered)
What the numbers mean
Volume is the footprint multiplied by the material depth. Cubic yards help compare supplier quotes; tons are the purchase unit for asphalt and gravel.
The asphalt calculator applies 145 lb per cubic foot. The gravel calculator applies 110 lb per cubic foot. Asphalt also adds the waste factor you select.
The material cost is a national planning range before delivery, labor, excavation, base preparation, tax, or other project-specific charges.
2026 material prices
| Material | 2026 average price | Note |
|---|---|---|
| Engineered wood fiber, per yard | $35.00 – $55.00 / cubic yard | Bulk delivered; the playground standard |
| Playground mulch, 2-cu-ft bag | $4.00 – $6.00 / 2-cu-ft bag | Retail; ~13.5 bags per yard |
| Rubber mulch, per yard | $120.00 – $200.00 / cubic yard | Doesn't decompose; hotter in sun |
Wave 1 Batch 3 content price guide, Sep 2026. 2026 U.S. national averages. Prices vary by region and retailer — confirm locally before buying.
Pro tips
- Match depth to the tallest fall height: 9 in to ~7 ft, 12 in to ~10 ft — this is a safety spec, not a look.
- Top up 1–2 in every year; mulch compacts and decomposes, and depth is what protects.
- Keep a 6-ft use zone clear around all equipment — the mulch bed must extend past the fall perimeter.
- Engineered wood fiber knits together and stays put; plain bark nuggets scatter across the yard.
- Never use pea gravel or sand under swings — they displace on impact and don't meet fall standards.
- A 20×20 area at 9 in needs 11.1 yards — about $389–$611 bulk, or 150 bags retail.
Common questions
Frequently asked questions
How much mulch for a 20×20 playground at 9 inches?
400 × 0.75 = 300 cu ft = 11.1 cubic yards, or 150 two-cu-ft bags.
How about 15×15 at 12 inches?
225 × 1 = 225 cu ft = 8.3 yards, or 113 bags.
How deep should playground mulch be?
9 in for fall heights up to ~7 ft; 12 in for up to ~10 ft.
Wood fiber vs rubber mulch?
Wood fiber at $35–$55/yd is the playground standard; rubber at $120–$200/yd lasts longer but gets hot in sun.
How often do I top it up?
Yearly — add 1–2 in to replace compaction and decomposition.
Bagged or bulk?
Bulk wins past ~3 yards — 150 bags at $4–$6 is $600–$900 versus $389–$611 delivered bulk.
Related calculators
Planning estimates only. Prices are 2026 U.S. national averages and vary by region — confirm with your local supplier before buying.