Mulch, Soil & Gravel Calculator
Calculating the right amount of bulk landscaping material — mulch, topsoil, gravel, or sand — prevents costly over-ordering and frustrating short-falls. Enter your coverage area dimensions (length × width) and the desired depth, and this calculator instantly converts those measurements into cubic yards and cubic meters, the standard units used by landscaping suppliers.
The tool also estimates how many bulk bags of a chosen size you will need and, if you enter a price per cubic yard, computes your total material cost. Whether you are mulching a flower bed, filling a raised garden, or laying a gravel pathway, accurate volume math saves time and money on every project.
How it works
Volume (ft³) = Length (ft) × Width (ft) × Depth (in) ÷ 12. Volume (yd³) = Volume (ft³) ÷ 27. Volume (m³) = Volume (yd³) × 0.764555. For metric inputs: Volume (m³) = Length (m) × Width (m) × Depth (cm) ÷ 100.
Use cases
- Determining how many cubic yards of mulch to order for garden beds
- Calculating topsoil volume needed to fill or level a raised garden bed
- Estimating gravel or crushed stone for a driveway or pathway
- Planning sand quantity for a children's sandbox or paver base
- Budgeting landscaping material costs before placing a bulk delivery order
Frequently asked questions
How many cubic yards of mulch do I need?
Multiply the area's length by its width in feet, multiply by the depth in inches, then divide by 12 to get cubic feet, and divide by 27 to get cubic yards. For example, a 100 ft² bed at 3 inches deep needs 100 × 3 ÷ 12 ÷ 27 ≈ 0.93 cubic yards. Enter your dimensions and the calculator does this instantly.
How much area does a cubic yard of mulch cover?
One cubic yard covers about 108 square feet at 3 inches deep, or roughly 324 square feet at 1 inch deep. Coverage is inversely proportional to depth, so doubling the depth halves the area covered. Choose your target depth first, then let the calculator size the order.
What depth of mulch or gravel should I use?
Mulch is commonly applied 2–4 inches deep for weed suppression and moisture retention, while gravel pathways often use 2–3 inches over a base layer. Deeper is not always better, as excessive mulch can suffocate plant roots. Enter your chosen depth to get an accurate volume.
How do I convert cubic yards to cubic meters?
Multiply cubic yards by 0.764555 to get cubic meters. For example, 3 cubic yards equals about 2.29 cubic meters. This calculator shows both units at once, which is helpful because suppliers in different countries sell bulk material by different volume standards.
How many bags of mulch equal a cubic yard?
It depends on bag size: standard bags are often 2 cubic feet, and since a cubic yard is 27 cubic feet, that is about 13.5 bags per cubic yard. For 3 cubic foot bags it is about 9 bags. Enter your bag size and the calculator estimates the number of bags needed.