mulch calculator
Estimate mulch for a rectangular bed.
Formula
V = length × width × depth × (1 + allowance/100)
Length: 12 ft · Width: 9 ft · Depth: 2 in · Cubic meters ≈ (12 ft × 0.3048 m/ft)×(9 ft × 0.3048 m/ft)×(2 in × 0.0254 m/in)×(1+(5)÷100) · Cubic yards ≈ (0.5351884006)÷0.9144^3 · Cubic feet ≈ (0.5351884006)÷0.3048^3
How to use
- Measure the rectangular area.
- Enter depth and any allowance.
- Read the volume in three units.
Examples
- 3 × 3 × 3 feet = 1 yd³ = 27 ft³.
Frequently asked questions
How deep should mulch be?
Depth depends on the material and planting; Maryland Extension advises 1–3 inches for bark.
What about irregular areas?
Split the area into rectangles and add their volumes.
Is the allowance automatic?
No. The displayed percentage is editable; use zero for geometric volume.
Sources
Updated: