Mulch Calculator

We turn your bed into an area, multiply by the depth to get a volume, then express that as the units mulch is sold in: cubic yards (bulk), cubic feet, and a bag count. Bag counts always round up — a partial bag means you buy a whole bag.

area:
  rectangle  = length × width
  circle     = π × (diameter / 2)²        (π = 3.14159)
  ring       = π × ((outer/2)² − (inner/2)²)
  total area = entered directly

volume:
  cu ft = area_sqft × (depth_in / 12)
  cu yd = cu ft / 27          (= area × depth_in / 324)

bags (round UP):
  bags(size) = ceil(cu ft / bag_size_cuft)

coverage cross-check:
  1 cu yd covers 324 / depth_in sq ft
    → 324 @ 1in · 162 @ 2in · 108 @ 3in · 81 @ 4in

cost (optional):
  bulk   = cu yd × $/cu yd
  bagged = bags(selected) × $/bag

weight (approximate range):
  cu yd × 400  to  cu yd × 800  lb

Multiple beds are summed in this session only — nothing is saved. The 2-vs-3 cu ft bag comparison always shows, since the two retail sizes are the decision you're actually making. Formulas and the coverage table follow The Calculator Site and Inch Calculator; depth guidance follows Lawn Love (see Sources). Mulch density varies widely by material, so the weight is a caveated 400–800 lb/cu yd range, never a single figure.