Measure on map

Mulch Calculator

Estimate bulk mulch or bags from square footage and depth.

Bed area
Mulch depth
Mulch depth
Order settings5% extra · 2 cu ft bags
Extra and bag size
Extra mulch
Measure on mapOpens the map tool.

Your estimate

Bulk

—

cu yd

Bagged

—

bags

Enter bed area to estimate bulk and bags.

Bag counts round up. Bulk delivery may be sold by half-yard or whole-yard increments.

How the estimate is calculated

Mulch volume is area multiplied by depth. The calculator adds your buffer before converting to cubic yards and bags.

Base mulch = area × (depth ÷ 12)

Extra mulch = base mulch × buffer %

Total mulch = base mulch + extra mulch

Cubic yards = total cubic feet ÷ 27

Bags = total cubic feet ÷ bag size, rounded up

Choosing mulch depth

Depth changes the order quickly. Use the depth that matches the job, then adjust if your supplier or installer recommends a different layer.

1 inch

Light top dressing for a thin refresh when beds already have enough mulch.

2 inches

Good for refreshing existing beds when old mulch is still in place.

3 inches

A common planning depth for most mulch beds.

4 inches

Useful for deeper new beds or stronger weed suppression.

Bulk vs. bags

Bulk usually makes sense for larger beds, especially with delivery and a clear drop location. Bags are easier for smaller jobs, tight access, and projects where color or material needs to stay separate.

BulkBest for larger jobs when you have delivery, a truck or trailer, and room for the drop.
BagsBest for smaller beds, touch-ups, tight access, or loads you need to move by hand.

Mulch calculator FAQ

  • How do I calculate how much mulch I need?

    Measure the bed area in square feet, multiply by mulch depth in feet, then add any buffer. Divide cubic feet by 27 for cubic yards or by bag size for bag count.

  • How deep should mulch be?

    One inch works as a light top dressing. Two inches can refresh existing beds. Three inches is a common planning depth. Four inches may fit new beds or stronger weed suppression.

  • How many bags of mulch are in a cubic yard?

    One cubic yard is 27 cubic feet. That is about 14 two-cubic-foot bags or 9 three-cubic-foot bags.

  • Should I buy bulk mulch or bagged mulch?

    Bulk is usually better for larger jobs, especially if the supplier can deliver and you have a clear drop location. Bags are easier for small beds, touch-ups, tight access, and projects that need different colors or mulch types.

  • Where should mulch not touch plants?

    Keep mulch pulled back from tree trunks, shrub stems, siding, and hard edges where moisture buildup can cause problems.

  • Should I measure the bed area on the satellite map first?

    Use the satellite map when the bed curves around trees, patios, walkways, or lawn edges. A traced area is better than a rectangle estimate for irregular beds.