From measured space to purchasable material
Mulch purchases are easier to compare when the bag order and bulk order start from the same measured bed area. Choose a rectangular or round bed, deduct paving or unmulched islands, and enter the intended settled depth. This tool converts that geometry into cubic yards and whole bags using the volume on the package. It also compares material prices without assuming delivery is free. The entered depth should suit the planting and mulch material; keep actual application decisions separate from the arithmetic of buying enough product.
Measure, select yield and round the order
- Select a bed shape and subtract unmulched islands.
- Enter the planned depth and labeled bag volume.
- Compare the bulk and whole-bag material totals.
Net requirement and purchase calculation
A worked example
A 20 × 5 ft bed at 3 in depth needs 25 ft³, or 0.93 yd³. That is 13 two-cubic-foot bags, costing $52 at $4 each.
Keep depth and settlement separate
On a 200-square-foot bed, two inches is 33.333 cubic feet while three inches is 50 cubic feet. Increasing the target depth by one inch increases this order by 50%. Settlement or handling allowance is a different assumption; applying it to a depth that already includes the same loss would count the adjustment twice.
Write down whether your entered depth is the desired finished layer or the supplied loose layer.
Mulch: what changes the result?
Compare the layer or product assumptions behind the material order. The comparisons below are calculated from this page’s default example. Each row changes only the named input; all other inputs stay at their displayed example values. These are mathematical scenarios, not measurements from a completed project.
| Changed assumption | Default input | Comparison input | Result: default → comparison |
|---|---|---|---|
| Rectangle length | 20 ft | 24 ft | Net mulched area: 100 → 120 sq ft Mulch volume: 25 → 30 cu ft |
| Rectangle width | 5 ft | 6 ft | Net mulched area: 100 → 120 sq ft Mulch volume: 25 → 30 cu ft |
| Mulch depth | 3 in | 3.6 in | Mulch volume: 25 → 30 cu ft Bulk mulch quantity: 0.9259 → 1.1111 yd³ |
| Volume per bag | 2 cu ft | 2.4 cu ft | Whole mulch bags: 13 → 11 Bag material estimate: 52 → 44 USD |
Displayed values are rounded. Whole-pack results change in steps; continuous quantities may change before a new pack is needed. To compare your actual project, enter your dimensions above, save a scenario, then change one assumption.
Coverage, allowance and purchasing limits
- Separate irregular beds into simple shapes, avoiding overlap.
- Existing mulch affects how much new depth is needed.
- Keep material placement around plants consistent with appropriate gardening guidance.
Frequently asked questions
How many 2-cubic-foot mulch bags cover 100 square feet?
At 3 in depth, the volume is 25 ft³, which rounds to 13 bags of 2 ft³.
Does the mulch estimate include delivery?
No. The price comparison covers material only, so add delivery and minimum-order charges.
Can I subtract a tree island or stepping stones?
Yes. Enter the combined area that will not receive mulch.
Read the project guides
- Mulch and Topsoil: Compare Bulk Yards with Bags
Convert bed area and depth into bulk cubic yards and whole bags, then compare complete material and delivery costs without mixing weight and volume.
- How Much Soil and Compost Does a Raised Bed Need?
Measure internal raised-bed volume, subtract headspace and excluded layers, split a chosen blend into component volumes and round bag quantities accurately.
Calculation method: JICWH methodology. Examples are planning assumptions, not product recommendations.