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Mulch Calculator

Enter your garden bed size and depth to find out how many bags or cubic yards of mulch you need.

1. Measure your area

feet
inches
feet
inches

2. Choose depth

2–3" for existing beds · 3–4" for new beds · 1–2" for top-dress

3. Adjust & price (optional)

5%
0%10%20%30%
$

How to measure your space

  1. 1. Rectangle beds: Walk the length and width with a tape measure. Record in feet and inches.
  2. 2. Curved or odd-shaped beds: Break the area into rough rectangles, measure each, and use the "Irregular" shape option to add them together.
  3. 3. Depth: Use a ruler to check existing mulch depth. For a new bed, 2–3" is standard; for heavy weed suppression, use 3–4".
  4. 4. Subtract obstacles: Deduct space taken by large plants, stones, or hardscape — or just leave the small ones in and let the 5% waste factor cover it.

Formula: Volume (cu ft) = Area (sq ft) × Depth (in) ÷ 12. Bags = Volume (cu yd) × 13.5, rounded up. See our methodology page for all constants and sources.