How to calculate mulch in cubic yards

Measure bed length × width for square feet (or break irregular beds into rectangles and add them up). Then use: cubic yards = square feet × depth in inches ÷ 324. That 324 constant converts cubic inches of coverage into cubic yards.

Example: a 200 sq ft bed at 3 inches needs 200 × 3 ÷ 324 ≈ 1.85 cubic yards — order about 2 yards so you are not short after settling. At 2 inches the same bed needs ≈ 1.2 cubic yards.

Always measure the planting beds you will actually mulch, not the whole yard footprint. Paths, lawn, and hardscape should stay out of the square-footage total.

Coverage by depth and common bed sizes

At 2 inches deep, 1 cubic yard covers about 162 sq ft. At 3 inches, 1 cubic yard covers about 108 sq ft. Most landscape beds look best at 2–3 inches; less than 2 inches weeds through faster, and more than 3–4 inches can smother roots or hold excess moisture.

Quick planning sizes at 3 inches: 100 sq ft ≈ 0.9 cu yd; 200 sq ft ≈ 1.9 cu yd; 500 sq ft ≈ 4.6 cu yd; 1,000 sq ft ≈ 9.3 cu yd. Round up slightly for uneven grade and settling.

Bag math: a standard 2 cubic foot bag covers about 8 sq ft at 3 inches or about 12 sq ft at 2 inches. So 200 sq ft at 3 inches is roughly 25 bags — often more expensive than one bulk delivery once you pass a few yards.

Bag vs bulk and dyed vs natural cost bands

In 2026, bulk hardwood or bark mulch commonly runs about $30–$80 per cubic yard delivered, depending on region, material, and fuel surcharges. Premium dyed black or brown mulch often sits toward the high end or adds a few dollars per yard versus natural.

Bagged mulch at big-box stores is often $3–$6 per 2 cu ft bag (sometimes more for specialty cedar or rubber). Small beds under ~1 cubic yard can be cheaper in bags; larger projects almost always win with bulk plus delivery.

Labor is separate: DIY spreading is mostly time and a wheelbarrow. Pro install/spreading commonly adds roughly $20–$50+ per cubic yard depending on access and bed prep. Budget edging, fabric, and weed pull if beds are overgrown.

Visualize coverage before you buy

A mulch calculator gets quantity right; a photo-based design shows whether 2 inches vs 3 inches, dark hardwood vs natural bark, and bed shapes actually look right against your house and lawn.

Upload a yard photo in Yard AI, generate mulched bed options, then buy the cubic yards or bags that match the layout you like — not a guess from a blank form. Use the ranges above for budgeting, then confirm local delivery prices for your ZIP.