Mulch Calculator
Estimate bulk mulch or bags from square footage and depth.
Need the bed area first?
Trace the bed, cleanup area, or yard section on the map, then use the square footage here.
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.
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. Bags are easier to carry, stage, and mix by color or material.
Bulk
Best for larger jobs when you have delivery, a truck, or a trailer.
Bags
Best for smaller beds, touch-ups, or loads you need to move by hand.
Before you order mulch
- Bulk sold by cubic yard, half-yard, or bag?
- Delivery available, or do you need a truck or trailer?
- Delivery minimum, fee, and drop location?
- Bag size, mulch type, and color on the label?
- Wheelbarrow or cart, shovel, rake, gloves, and tarp ready?
- Keep mulch pulled back from trunks and stems?
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?
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. Bags are easier for small beds, touch-ups, tight access, and projects that need different colors or mulch types.
What tools do I need to spread mulch?
For bulk mulch, plan on a wheelbarrow or garden cart, shovel, rake, gloves, and a tarp. For bags, a utility knife and rake are usually enough for small beds.
Can I haul bulk mulch myself?
Often, but confirm weight, volume, and loading rules with the supplier. A cubic yard can be heavy, so many homeowners use delivery for larger orders.
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.
Can I use length and width instead of square footage?
Yes. Choose the length × width estimate option, enter up to three simple bed sections, and the calculator will estimate square footage first.
Should I measure the bed area on the map first?
Use the map when the bed curves around trees, patios, walkways, or lawn edges. A traced area is better than a rectangle estimate for irregular beds.
Need the bed area first?
Search the address, trace the bed or yard section, and use the square footage for mulch planning.