How Much Mulch or Gravel Do I Need?
Landscape material is sold by volume, so the math is length times width times depth. The only trick is keeping units consistent: measure the bed in feet, but convert your depth from inches to feet by dividing by twelve before multiplying. The calculator handles that and reports the result three ways — cubic yards for bulk delivery, cubic feet, and the number of standard 2-cubic-foot bags.
How deep should you go?
For mulch, 2 to 3 inches is the sweet spot: enough to suppress weeds and hold moisture without smothering roots. Gravel paths and drainage usually want 2 to 4 inches, and a decorative stone top-dressing can be shallower. Going deeper than needed is the most common way people overspend on material.
Bags or bulk?
Once you pass roughly a cubic yard — about fourteen 2-cubic-foot bags — bulk delivery by the yard is almost always cheaper per unit and saves you hauling and opening dozens of bags. Below that, bags are convenient and let you buy exactly what you need. The weight estimate helps you check whether your vehicle or wheelbarrow can handle a load: gravel is heavy, running well over a ton per cubic yard, while mulch is light.
Frequently asked questions
- How many bags in a cubic yard?
- A cubic yard is 27 cubic feet, so about 14 bags of the common 2-cubic-foot size, or 13.5 exactly.
- How deep should mulch be?
- Two to three inches suppresses weeds and retains moisture without suffocating plant roots.
- Is bulk cheaper than bags?
- Almost always, once you need a cubic yard or more. Below that, bags are more convenient.