How do I calculate how much mulch I need?

Measure the length and width of your garden bed in feet, multiply to get square footage, then multiply by the desired depth in inches and divide by 324 to get cubic yards. One cubic yard covers about 162 square feet at 2 inches deep.

How deep should mulch be?

Most garden beds need 2-4 inches of mulch. Use 2 inches for flower beds and around annuals, 3 inches for general landscaping and perennials, and 4 inches for pathways and high-traffic areas. Avoid piling mulch against plant stems or tree trunks.

How many bags of mulch do I need?

A 2 cubic foot bag covers about 12 square feet at 2 inches deep, 8 square feet at 3 inches, or 6 square feet at 4 inches. A 3 cubic foot bag covers about 18 square feet at 2 inches deep. Divide your total cubic feet needed by the bag size.

Is it cheaper to buy mulch in bags or bulk?

Bulk mulch is generally cheaper for large projects (over 3-4 cubic yards). Bagged mulch costs $3-7 per bag, while bulk mulch runs $20-50 per cubic yard. For small areas, bags may be more convenient despite higher per-yard cost.

Mulch Calculator | Galick Tools

Garden Bed Area

Length

Width

Radius

Total Area

Enter the total combined area of all beds

Mulch Depth

Select a common depth or enter a custom value

Custom Depth (inches) Typical range: 2-4 inches

Mulch Calculation Results

Cubic Yards Needed

0 cu yd

For bulk delivery orders

Total Area

sq ft

Cubic Feet

cu ft

Depth

inches

Bags Needed

2 cu ft bags 0

3 cu ft bags 0

Cost Estimate (Optional)

Price per Bag (2 cu ft)

Mulch Reference Guide

Recommended Depths

Application	Depth
Flower beds & annuals	2 inches
Shrubs & perennials	2-3 inches
Trees (around drip line)	3-4 inches
Pathways & walkways	4 inches
Playground areas	4-6 inches

Coverage Rates

Amount	Coverage at 3"
1 cubic yard	108 sq ft
2 cu ft bag	8 sq ft
3 cu ft bag	12 sq ft
1 cubic foot	4 sq ft

Types of Mulch

Hardwood: Long-lasting, great for trees and shrubs
Pine bark: Acidic, ideal for azaleas and rhododendrons
Cedar: Natural pest repellent, aromatic
Cypress: Resists decay, holds color well
Rubber: Permanent, best for playgrounds
Straw: Temporary, good for vegetable gardens

Mulching Tips

Keep mulch 2-3 inches away from plant stems and tree trunks
Remove old mulch or rake before adding new layers
Water the bed before and after applying mulch
Bulk is cheaper for areas over 3 cubic yards
Add 10% extra for settling and uneven spreading
Refresh mulch annually to maintain proper depth