Mulch Calculator

Mulch is measured in cubic yards because it's sold in bulk by volume, not by weight. The core formula every landscaper uses is simple: Length (ft) × Width (ft) × Depth (ft) ÷ 27 = Cubic Yards. The division by 27 converts cubic feet into cubic yards, since one cubic yard equals 27 cubic feet. For most residential beds, you'll be applying between 2 and 3 inches of mulch, which converts to 0.167 ft and 0.25 ft respectively when you plug depth into the formula.

Start by breaking your yard into simple rectangles. Foundation beds along the front of the house are usually one long rectangle; island beds and tree rings can be approximated as circles using π × r² × depth ÷ 27. For irregular organic shapes, measure the longest length and average width — a small overshoot is safer than running short on delivery day. Add every bed's cubic yardage together to reach a single delivery number.

Depth is where most homeowners get it wrong. A fresh bed benefits from a full 3-inch layer to smother weeds and lock in soil moisture during the summer growing season. A yearly refresh on an established bed only needs 1 to 2 inches on top of what's already there — anything deeper starves plant roots of oxygen and can promote root rot or fungal growth. Always pull mulch back at least 2 inches from tree trunks and siding to prevent moisture damage and pest nesting.

Once you know the cubic yardage, decide between bagged and bulk. Standard retail bags hold 2 cubic feet, so it takes 13.5 bags to equal a single cubic yard. Bulk mulch is almost always cheaper per yard once your project exceeds one yard, and vendors will typically deliver 3+ yards for a small flat fee. Bagged mulch wins on convenience for small refreshes because you can haul it in a sedan and store leftovers dry. Use the calculator above to compare both side-by-side before you buy.

Need mulch installed, not just calculated? See our landscaping services in Doylestown, Morrisville, Langhorne, Bensalem, Warminster, and Richboro.