Free estimator
Mulch Calculator
Use this mulch calculator to estimate cubic feet, cubic yards, bag count, and optional material cost for garden beds, borders, and landscaping areas.
Last updated: July 6, 2026
How to measure
Measure the length and width of each bed, then choose your mulch depth. For irregular beds, split the space into smaller rectangles and add the estimates together. Most beds need a 2 to 3 inch layer.
Formula
cubic feet = length(ft) x width(ft) x depth(in) / 12
cubic yards = cubic feet / 27
bags needed = cubic feet / bag size cubic feet
Cubic feet vs cubic yards
Mulch bags are often labeled in cubic feet, while bulk mulch from landscape suppliers is usually priced by cubic yard. Use cubic feet when comparing bag sizes, and cubic yards when ordering bulk delivery.
The key conversion is simple: 1 cubic yard = 27 cubic feet. For example, 54 cubic feet of mulch is 2 cubic yards before any waste allowance.
Tips before buying
- Confirm whether your supplier sells mulch by bag, cubic foot, or cubic yard.
- Keep mulch thinner near stems, trunks, foundations, and hardscape edges.
- Add extra material for settling and uneven bed surfaces.
- Compare bagged mulch by cubic feet, not just the number of bags.
FAQ
How deep should mulch be?
Most landscape beds use about 2 to 3 inches of mulch. Use less near plant crowns and avoid piling mulch against trunks or stems.
How many cubic feet are in a cubic yard of mulch?
One cubic yard equals 27 cubic feet. Bagged mulch is usually sold by cubic feet, while bulk mulch is often sold by cubic yards.
Should I add extra mulch for waste?
A 5% to 10% extra allowance is useful for uneven beds, settling, edging, and measuring variation.
Should I buy mulch by cubic feet or cubic yards?
Bagged mulch is usually easier to compare by cubic feet, while bulk mulch is commonly sold by cubic yards. One cubic yard equals 27 cubic feet.