How it works
How to calculate it
The calculator applies the values you enter to this formula:
Cubic yards = length × width × (depth ÷ 12) ÷ 27.
How to use this calculator
- Measure each planting bed.
- Choose the desired final depth.
- Enter bulk price and combine separate bed results.
Worked example
A 20 × 15 ft bed covered 3 inches deep needs about 2.8 cubic yards.
Important assumptions
- The bed is rectangular and level.
- Compaction and settlement are not added.
- Bulk suppliers may require whole or half-yard orders.
Common mistakes to avoid
- Adding a full new layer without measuring existing mulch.
- Using inches directly as feet.
- Piling mulch against trunks and plant crowns.
Method reviewed June 10, 2026. Prices and rates are user-provided defaults and should be replaced with local values.