How Much Mulch for 400 Square Feet?
Covering 400 sq ft with mulch 3 inches deep takes 3.70 cubic yards — that's about 50 bags (2 cu ft each), or cheaper bought in bulk. Change the depth or area below for your beds.
Mulch needed
3.70 cu yd
Bed area
400 sq ft
Mulch needed
3.70 cubic yards100 cubic feet at 3" deep
2-cu-ft bags
50 bagsbagged mulch is sold in 2 cu ft bags
Bulk cost (est.)
$167~$45/CY delivered vs $200 bagged
Doing this for work? Estimate the whole job in minutes.
JRIQ turns plans and site photos into full material + labor estimates with AI — built by the team behind these calculators.
Try it free →
How this is calculated
Mulch volume = bed area × depth. We convert cubic feet to cubic yards for bulk delivery and to 2-cu-ft bags for the bagged option, so you can compare cost both ways.