How is mulch volume calculated?

Volume = Length × Width × Depth for rectangular areas, or π × (Diameter / 2)² × Depth for circular areas. Convert depth to the same unit as the length and width before multiplying. Divide cubic feet by 27 to get cubic yards.

How many cubic yards of mulch do I need?

Divide the total volume in cubic feet by 27 to get cubic yards. For example, a 10 ft × 20 ft bed at 3 inches deep = 10 × 20 × (3/12) = 50 ft³ ÷ 27 ≈ 1.85 cubic yards.

How many bags of mulch equal a cubic yard?

A 2 cu ft bag: 13.5 bags per cubic yard. A 3 cu ft bag: 9 bags per cubic yard. A 2.8 cu ft bag: about 9.6 bags per cubic yard.

How deep should I apply mulch?

For weed suppression and moisture retention, 2–4 inches (5–10 cm) is recommended. Avoid applying more than 4 inches, as very thick mulch can suffocate plant roots and promote rot.

Why should I add a waste factor?

Mulch settles over time and some is lost when spreading around edges or irregular shapes. Adding 5–10% to your calculated amount ensures you will not run short.

Is bulk or bagged mulch more economical?

Bulk mulch is typically less expensive per cubic yard for larger projects (over 2–3 yards). Bagged mulch is convenient for small areas and easy to transport in a standard vehicle.

Mulch Calculator

Name: Mulch Calculator
Availability: InStock
Author: Nham Vu

Calculate how many cubic yards or bags of mulch you need to cover any area at a given depth.

Area & Depth

Length (ft)

Width (ft)

Depth (in)

Waste Factor (%)

Bag Size (for bagged mulch)

Summary