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Mulch Calculator

Calculate how much mulch you need in cubic yards and bags. Adjust depth and get a cost estimate for bulk or bagged mulch.

Quick Answer

Cubic Yards = (Area in sq ft x Depth in inches) / 324. A 500 sq ft bed at 3 inches deep needs about 4.6 cubic yards or 63 bags (2 cu ft each). Bulk delivery is typically $25-50 per cubic yard.

Calculate Mulch Needed

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About This Tool

The Mulch Calculator helps homeowners determine exactly how much mulch to order for garden beds, landscaping, and walkways. It calculates volume in cubic yards for bulk delivery and number of bags for store purchases, with an optional cost estimator to compare bulk vs bagged pricing.

Choosing the Right Depth

Three inches is the gold standard for most garden beds. This depth effectively suppresses weeds, retains soil moisture, and regulates soil temperature. Thinner layers allow weed breakthrough while thicker layers can suffocate plant roots and create conditions for fungal growth. Around trees, keep mulch 3-6 inches away from the trunk to prevent rot.

Bulk vs Bagged

For projects requiring less than 2-3 cubic yards, bagged mulch from a home improvement store is convenient despite the higher per-yard cost. For larger projects, bulk delivery saves 40-60% and reduces the physical effort of hauling and opening dozens of bags. Most landscape supply companies deliver for free above a minimum order.

Frequently Asked Questions

How deep should mulch be?
Apply mulch 2-4 inches deep for most garden beds. The standard recommendation is 3 inches for weed suppression, moisture retention, and temperature regulation. Use 2 inches for fine mulches like cocoa hulls and up to 4 inches for coarse materials like bark nuggets. Avoid exceeding 4 inches as it can suffocate plant roots and trap excess moisture.
How much does a cubic yard of mulch cover?
One cubic yard of mulch covers approximately 162 sq ft at 2 inches deep, 108 sq ft at 3 inches deep, or 81 sq ft at 4 inches deep. A cubic yard equals 27 cubic feet. For reference, a standard pickup truck bed holds about 2-3 cubic yards of mulch.
Is bulk mulch or bagged mulch cheaper?
Bulk mulch delivered by the cubic yard is typically 40-60% cheaper than bagged. Bulk mulch costs $25-50 per cubic yard while bagged mulch costs $4-6 per 2 cu ft bag, which works out to $54-81 per cubic yard equivalent. However, bagged is easier to handle and better for small projects under 2 cubic yards.
How often should you replace mulch?
Organic mulch should be topped off annually, typically in spring. Most organic mulches decompose over 1-2 years, adding nutrients to soil. You don't need to remove old mulch; just add enough to maintain 3 inches of depth. Inorganic mulches like rubber or stone last indefinitely but don't improve soil.
What type of mulch is best?
Hardwood bark mulch is the most popular all-purpose choice, offering good weed suppression and slow decomposition. Cedar mulch repels insects naturally. Pine straw works well for acidic-soil plants like azaleas. Rubber mulch is best for playgrounds. For vegetable gardens, straw or shredded leaves are preferred as they decompose fastest and enrich soil.

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