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Mulch Bed Calculator · Free calculator

8x8 Mulch Bed Calculator

Mulching a 8' × 8' bed (64 sq ft) 3" deep takes 0.62 cubic yards — 9 bags of 2 cu ft mulch with 5% extra. Here's 2", 3" and 4" depth, bag vs bulk cost and the fabric and edging for 8x8.

Quick answer

3" deep (standard)
0.62 yd³
2 cu ft bags @ 3"
9
2 cu ft bags @ 2"
6
Bags cost @ 3"
$36
Bulk cost @ 3"
$30
Edging
32 LF

▍Mulch Calculator

Material
ft
in
ft
in
in
Waste Factor
$
L = 8' 0"W = 8' 0"D = 3"
Cubic Yards
0.62yd³
incl. 5% waste · Bulk delivery: order 0.75 yd³
Cubic Feet
16.80ft³
Area
64.0sq ft
Weight
0.19tons
Weight
373lbs
Mulch bags needed
  • 2 cu ft bag (2 ft³ yield)9

Mulch for a 8x8 bed by depth

64 sq ft, 5% extra. Bags ~$4.00 (2 cu ft), bulk ~$40/yd³.

DepthUseCubic yards2 cu ft bagsBags $Bulk $Weight
2"Refresh existing bed0.41 yd³6$24$20249 lbs
3"Standard (weed control)0.62 yd³9$36$30373 lbs
4"New bed / heavy weeds0.83 yd³12$48$40498 lbs

Bed prep for 8x8

ItemQuantityNotes
Landscape fabric (3' × 50' rolls)170 sq ft incl. 10% overlap
Bed edging (20' sections)232 LF perimeter
Fabric staples8~1 per 9 sq ft
Pickup loads (≈2.5 yd³)1bulk mulch @ 3"

How the math works

  1. Area: 8 ft × 8 ft = 64 sq ft
  2. Volume @ 3": 64 × (3 ÷ 12) = 16.00 cu ft
  3. Add 5%: 16.00 × 1.05 = 16.80 cu ft
  4. Cubic yards: 16.80 ÷ 27 = 0.62 yd³
  5. Bags: 16.80 ÷ 2 cu ft = 9 bags

Trade pro tips

  • 0.62 yd³ at 3" — bags are easier than bulk for this size.
  • Keep mulch 2"–3" away from trunks and siding — no "mulch volcanoes".
  • Refreshing an existing bed usually only needs 1"–2" on top.
  • One cubic yard of bulk mulch = 13.5 two-cu-ft bags.
  • A half-ton pickup carries 2–3 yd³ of mulch; a full-size bed with sides can take about 3.

Frequently asked questions

How many bags of mulch do I need for a 8x8 area?

At 3" deep, 9 bags of 2 cu ft mulch. At 2": 6 bags. At 4": 12 bags. All include 5% extra for 64 sq ft.

How many yards of mulch for 8x8?

2": 0.41 yd³; 3": 0.62 yd³; 4": 0.83 yd³. Bulk mulch is sold by the cubic yard; 1 yd³ = 13.5 bags of 2 cu ft.

How much does it cost to mulch a 8x8 bed?

At 3": about $36 in bags or $30 in bulk before delivery. Bags are usually simpler at this size.

How much does the mulch for 8x8 weigh?

About 373 lbs at 3" (mulch runs 400–800 lbs per yd³ depending on moisture). That's 0.2 half-ton pickup loads of bulk mulch.