Landscaping · updated 2026
Mulch Cubic Yards Calculator
Bulk mulch is sold by the cubic yard, while garden centers sell two-cubic-foot bags. This mulch cubic yards calculator converts bed length, width, and depth into cubic yards, 2-cu-ft bag equivalents, bulk and bagged costs, and the savings difference. Prices are editable and TBD — verify locally. Use the main mulch calculator for more area modes and broader project planning.
Use the main mulch calculator for multiple beds, tree rings, and total-area mode.
2–4 in is a common planning range; keep mulch away from stems and trunks
TBD — verify delivered bulk price
TBD — verify 2-cu-ft bag price
Show the math
Cubic yards = 20 × 10 × (3 ÷ 12) ÷ 27 = 1.85 yd³
2-cu-ft bags = 1.85 yd³ × 13.5 = 25 bags (rounded up)
Bulk cost = 1.85 yd³ × your local bulk price = 0
Savings = bagged cost 0 − bulk cost 0 = 0
Cubic yards versus bags
Bulk mulch is ordered by the cubic yard. A two-cubic-foot retail bag is 2/27 of a cubic yard, so about 13.5 bags make one yard. The calculator displays both units so you can compare a delivery quote with a store-run plan.
The bulk and bagged totals use the prices you enter. No national mulch price is assumed here; verify both prices and delivery locally.
Depth guide
Two inches can suit a top-up when old mulch remains. Three inches is a common bed starting point, while four inches may be used for a new bed when the plants and site allow it.
Keep mulch away from trunks, stems, siding, and foundation vents. Depth is the input that drives the result, so measure the layer you actually intend to install.
Bulk versus bagged
Bulk may be cheaper once the project reaches roughly a cubic yard, but delivery can change the result. Bags are easier to move through gates or around small beds, even when their unit price is higher.
Use the savings line as a project comparison, not a universal rule.
Mulch types and maintenance
Bark, wood chips, rubber, and pine straw differ in appearance, settling, decomposition, and maintenance. Volume is the cleanest common unit for this calculator; verify the product size printed on the bag.
Top up only what has settled or decomposed. A full replacement every season is not automatically necessary.
Methodology and assumptions
The calculator multiplies bed area by depth in feet, divides by 27, multiplies cubic yards by 13.5 for two-cubic-foot bags, and compares the local bulk and bag prices you enter. Prices are TBD — verify.
What the numbers mean
Bulk mulch is sold by the cubic yard; stores sell it in 2-cu-ft bags. About 13½ bags make a cubic yard, and bulk delivery is usually cheaper above roughly 1 yard. The depth you entered drives everything — 3 inches is the standard that suppresses weeds without suffocating plants.
2026 material prices
Material, labor, coverage, and density defaults are TBD — verify with your local supplier or manufacturer before ordering. 2026 U.S. national averages. Prices vary by region and retailer — confirm locally before buying.
Pro tips
- Three inches is a common bed depth; use the site conditions and plant requirements rather than burying stems or trunks.
- Bulk delivery may be cheaper once the project reaches roughly a yard, but local delivery and bag promotions change the crossover.
- Leave the trunk flare visible and keep mulch away from siding, vents, and plant crowns.
- Measure each bed separately when shapes vary; a rectangle is only an estimate for curved or irregular beds.
- Pine straw, bark, chips, and rubber do not have identical weight or settling behavior, so compare volume rather than bag weight.
- Prices are TBD — verify before ordering.
Common questions
Frequently asked questions
How many cubic yards of mulch do I need?
Multiply bed square feet by depth in feet and divide by 27. A 100-square-foot bed at 3 inches is about 0.93 raw cubic yards; this calculator reports the cubic-yard result and bag equivalent.
How many bags of mulch equal a cubic yard?
About 13.5 two-cubic-foot bags equal one cubic yard. The calculator multiplies cubic yards by 13.5 and rounds the purchased bag count up.
Is it cheaper to buy mulch in bulk or bags?
Bulk often wins after roughly a yard, but the crossover depends on delivery, bag price, mulch type, and local promotions. Enter both prices to compare your project.
How deep should mulch be in flower beds?
Two to three inches is a common maintenance range; three to four can be used for stronger coverage where appropriate. Never pile it against stems or trunks.
How often should I replace mulch?
Many beds need a yearly top-up and a fuller refresh every two to three years, but decomposition and settling vary by mulch type, weather, and depth.
Can I put new mulch over old mulch?
Yes, if the total layer will not become too deep and the old material is not matted or contaminated. Rake and inspect first, then top up only what the bed needs.
Related calculators
Planning estimates only. Prices are 2026 U.S. national averages and vary by region — confirm with your local supplier before buying.