Mulch Calculator
Calculate mulch needed for garden beds: area, depth, bags or bulk cubic yards, including the 3-inch depth recommendation.
About this tool
This mulch calculator converts bed area and depth into cubic yards, bag counts and approximate weight — the numbers you need before ordering soil, compost or bark mulch.
Under-ordering means a second trip; over-ordering means a pile rotting in the driveway. Three inches is the sweet spot for weed control and moisture retention.
FAQ
How deep should mulch be?
2-4 inches (3 is standard). Deeper smothers roots and holds excess moisture; shallower lets weeds through.
Bagged or bulk?
Bulk is far cheaper above about 2 cubic yards. Bags make sense for small beds and easy transport.
Should I remove old mulch?
Only if it has matted into a water-blocking layer. Otherwise top it up to the correct depth.