Soil & mulch calculator

How much soil or mulch a bed needs — cubic metres or litres, plus a bag count for common sizes.

Calculated in this browser. Nothing is sent anywhere.

Litres = L × W × D (cm) ÷ 1000 × fill%. Lower fill% covers lasagna-style beds with a cheaper base layer. Compost settles — order ~10% extra if filling to the rim.

How to use

  1. Enter the bed's length, width, and depth.
  2. Choose a bag size (10/20/25/40/50 L).
  3. Read the volume and bag count.

What it supports

Rectangular beds: volume = L × W × D. Bag counts round up and assume loose-fill product — soil compacts roughly 10–25 % after watering, so consider a bag extra. Covers raised beds, pots (as boxes), and top-dressing; circular beds are out of scope.

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