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Mulch Calculator

Whole bags or bulk volume from area and application depth.

Your project

Enter your measurements. Required fields are labeled; assumptions and optional quotes can be edited below.

Loading measurement inputs…

Calculator inputs
Length Required
Enter whole feet and inches less than 12. One blank component means 0.
Width Required
Enter whole feet and inches less than 12. One blank component means 0.
Additional mulch depth Required
Use a decimal point. Complete or clear an unfinished measurement before changing its units.

Enter only the additional depth you intend to add over existing mulch. Choose your own application depth.

Allowance
0–50%. Optional extra material volume. No automatic settling or compaction factor is applied.
Material options

Applied preset: US-market. No assumptions changed. Display units do not select a market preset.

Actual labeled volume of one bag, in ft³. Supported range: 0.035–35.315 ft³.
Optional cost
Optional quote in USD per bag. Zero is valid. Two decimals for direct prices; converted rates allow up to six decimals. Excludes tax, delivery and labor.

How this calculator works

Enter the rectangle or known area and only the additional depth you intend to add over any existing mulch. Apply an optional volume reserve. In bags mode the calculator rounds the requirement to whole labeled bags; bulk mode keeps the required volume continuous. Choose the application depth for your own project; this tool does not prescribe a universal horticultural depth.

Volume formulaBase = area × new depth; required = base × (1 + allowance / 100); bags = ceilSafe(required / bag volume).

Assumptions and limitations

Use the actual labeled bag volume. US-market defaults to 2 ft³ per bag; the explicit Metric-market preset selects 50 L. Changing display units preserves the physical bag size. Bought volume is whole bags × bag volume. Package surplus is bought volume minus the requirement, separate from the reserve. Bag and bulk prices stay independent. No weight, density or settling factor is used. Costs exclude tax, delivery and labor.

Worked examples

20 × 5 ft at 3 in depth and 0% reserve needs 25 ft³, or 0.9259259259 yd³. With 2 ft³ bags, 13 bags supply 26 ft³ with 1 ft³ surplus. At $4/bag, the subtotal is $52.00.

12 m² at 6 cm depth and 10% reserve has a 0.72 m³ base and needs 0.792 m³, or 792 L. With 50 L bags, 16 bags supply 800 L with 8 L surplus. At $6/bag, the subtotal is $96.00.

These are reference examples. Your estimate uses only the measurements and assumptions you enter above.

Read the calculation methodology