Mulch Calculator
Mulch Calculator
Enter the length, width, and depth of your garden bed to find how much mulch to buy — in cubic feet, cubic yards, and standard 2-cubic-foot bags (the most common retail bag size).
A typical recommended mulch depth is 2-3 inches — enough to suppress weeds and retain soil moisture without smothering plant roots — and this calculator converts your bed's footprint and chosen depth directly into the number of standard 2-cubic-foot retail bags you'll need, avoiding the common mistake of guessing and running short mid-project. For larger beds, buying mulch in bulk by the cubic yard from a landscaping supplier is usually significantly cheaper per cubic foot than buying enough individual retail bags to cover the same area — this calculator's cubic-yard figure makes that bulk-order comparison straightforward.
- Imperial: Cubic Feet = Length × Width × (Depth in inches ÷ 12); Bags = Cubic Feet ÷ 2 (standard 2 cu ft retail bag). Example: 20×10 ft at 3 in = 50 cu ft ≈ 25 bags.
- Metric: Cubic Meters = Length × Width × (Depth in cm ÷ 100); Bags = Cubic Meters ÷ 0.06 (standard 60 litre retail bag). Example: 6×3 m at 8 cm = 1.44 m³ ≈ 24 bags.
- Depth guidance: 5-8 cm (2-3 in) is typical for refreshing existing mulch; 8-10 cm (3-4 in) for a new bed.
How often should I re-mulch?
Most organic mulches break down over 1-2 years, so an annual or biannual top-up of 1-2 inches is common.
Is bagged or bulk mulch cheaper?
For large areas, bulk (delivered by the cubic yard) is usually cheaper than buying many individual bags.
Mulch Calculator
Enter the length, width, and depth of your garden bed to find how much mulch to buy — in cubic feet, cubic yards, and standard 2-cubic-foot bags (the most common retail bag size).
A typical recommended mulch depth is 2-3 inches — enough to suppress weeds and retain soil moisture without smothering plant roots — and this calculator converts your bed's footprint and chosen depth directly into the number of standard 2-cubic-foot retail bags you'll need, avoiding the common mistake of guessing and running short mid-project. For larger beds, buying mulch in bulk by the cubic yard from a landscaping supplier is usually significantly cheaper per cubic foot than buying enough individual retail bags to cover the same area — this calculator's cubic-yard figure makes that bulk-order comparison straightforward.
- Imperial: Cubic Feet = Length × Width × (Depth in inches ÷ 12); Bags = Cubic Feet ÷ 2 (standard 2 cu ft retail bag). Example: 20×10 ft at 3 in = 50 cu ft ≈ 25 bags.
- Metric: Cubic Meters = Length × Width × (Depth in cm ÷ 100); Bags = Cubic Meters ÷ 0.06 (standard 60 litre retail bag). Example: 6×3 m at 8 cm = 1.44 m³ ≈ 24 bags.
- Depth guidance: 5-8 cm (2-3 in) is typical for refreshing existing mulch; 8-10 cm (3-4 in) for a new bed.
How often should I re-mulch?
Most organic mulches break down over 1-2 years, so an annual or biannual top-up of 1-2 inches is common.
Is bagged or bulk mulch cheaper?
For large areas, bulk (delivered by the cubic yard) is usually cheaper than buying many individual bags.