🇺🇸 Cubic Yards & 2 cu ft bags 🇬🇧 Cubic Metres & 60L bags 🇦🇺 70L bags

Mulch Calculator

Calculate mulch for any garden bed, tree ring, or path. Shows cubic yards (US), cubic metres (UK/AU), and bag counts for common bag sizes across the US, UK, and Australia.

Quick Answer
Cubic yards = (length ft × width ft × depth in) ÷ 324. Cubic metres = length m × width m × depth cm ÷ 100.
💡 Recommended depths: Flower beds 2–3 in (5–8 cm) · Tree rings 3–4 in (8–10 cm) · Paths 4–6 in (10–15 cm)
Country Common Bag Size Volume Per Bag Typical Recommended Depth
🇺🇸 United States 2 cu ft bag0.0566 m³2–3 in (5–8 cm)
🇬🇧 United Kingdom 60 litre bag0.060 m³5–8 cm (RHS)
🇦🇺 Australia 70 litre bag0.070 m³5–10 cm
🇨🇦 Canada 2 cu ft bag0.0566 m³5–8 cm / 2–3 in
🇩🇪 Germany / EU 40–70 litre bags0.040–0.070 m³5–10 cm

Frequently Asked Questions

How many bags of mulch do I need?

For a 200 sq ft bed at 3 inches deep: ~1.85 cubic yards (1.41 m³). That's ~25 of the US 2 cu ft bags, ~24 UK 60L bags, or ~20 AU 70L bags. For volumes over 2 cubic yards (1.5 m³), bulk delivery from a landscape supplier is typically 30–50% cheaper per cubic yard than bagged mulch.

How deep should I spread mulch?

Garden borders: 2–3 in (5–8 cm). Tree rings: 3–4 in (8–10 cm) — keep 15 cm / 6 in away from trunk. Paths: 4–6 in (10–15 cm). Vegetable beds: 2 in (5 cm) organic mulch. UK RHS recommends 7.5 cm for most ornamental borders. Too deep can suffocate roots; too shallow loses weed suppression.