Mulch Calculator
Calculate the exact amount of mulch for landscape beds by entering the bed area and desired depth. The calculator outputs cubic yards for bulk delivery (the cheapest option for areas over 2 cubic yards), bag counts for both 2 cu ft and 3 cu ft bags, and a cost comparison between bulk and bagged. Recommended mulch depth is 3 inches for weed suppression and moisture retention — less than 2 inches provides minimal benefit, and more than 4 inches can waterlog roots and cause crown rot on trees and shrubs. Keep mulch 2–3 inches away from tree trunks and plant stems. Shredded hardwood bark is the most common choice; rubber mulch is better for playgrounds where cushioning matters. Bulk mulch delivery is usually cheaper for anything over 2–3 cubic yards.
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Top PickVigoro Brown Mulch 2 cu ft — Home Depot~$4.98/bag* Affiliate links — we may earn a commission at no cost to you.
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How to Use This Calculator
- 1Enter your measurements in the fields above. Use the units shown next to each field (ft, in, etc.).
- 2Click Calculate to get your material estimate instantly.
- 3Review the highlighted result — it shows the key quantity you need to order.
- 4Use Copy Results to save your estimate, or bookmark the URL — your inputs are encoded in the link.
Pro tip: Always add 10% to your material order to account for waste, cuts, and defects.
Frequently Asked Questions
How much mulch do I need for a 100 sq ft bed?
At 3 inches deep, a 100 sq ft bed needs 25 cubic feet, or about 1 cubic yard of bulk mulch. That's 13 bags of 2 cu ft mulch or 9 bags of 3 cu ft mulch.
How often should I refresh mulch?
Organic mulch (shredded bark, wood chips) decomposes over 1–2 seasons and should be refreshed annually or every other year. Add only 1–2 inches of new mulch on top of existing mulch — don't pile on thick new layers every year, as this creates an excessively thick mat that blocks water and air. Remove or turn old mulch before adding a full new layer.
What is the difference between bulk and bagged mulch?
Bulk mulch is delivered by the cubic yard and is significantly cheaper for large projects — typically $25–$50/cubic yard. Bagged mulch costs $4–$7 per 2 cu ft bag ($54–$95 per cubic yard equivalent). Use bags for small beds or where you need to carry mulch to an inaccessible area. Use bulk delivery for anything over 3–4 cubic yards.
Is mulch or rock better for landscaping?
Organic mulch (wood chips, shredded bark) is better for plant health — it decomposes and improves soil over time, retains moisture, and moderates soil temperature. Rock/gravel is better for low-maintenance areas, around A/C units, or where you don't want ongoing replenishment. Rock doesn't decompose but weeds still grow through it without a quality weed barrier underneath.