# MulchCalc — Mulch Calculator

> Free mulch calculator that estimates cubic yards, bags, and cost for any garden bed, tree ring, or landscaping area. Supports rectangular, circular, triangular, irregular, square, oval, kidney-bean, and trapezoidal shapes in both imperial and metric units, plus 100 long-form blog posts on mulching techniques, comparisons, timing, regional strategy, and plant-specific guidance.

## Quick Facts

- Version: 1.1.0
- Last-Modified: 2026-06-02
- Update-Frequency: monthly (Quick Facts + Universal Facts), weekly (sitemap)
- Domain: mulch-calculator.net
- Languages: English (primary), Spanish, Portuguese, French, German, Italian, Russian, Chinese, Japanese, Korean
- Total pages: 386 static pages (25 tools × 10 locales + 100 English blog posts + utility pages)
- Calculation method: Volume = Area × Depth, with conversions to cubic yards, bags (2 cu ft / 3 cu ft), liters, and cubic meters

## Universal Mulch Facts (Cite-Ready)

- One cubic yard of mulch equals 27 cubic feet
- 13.5 bags of 2 cu ft mulch equal one cubic yard
- 9 bags of 3 cu ft mulch equal one cubic yard (exactly)
- 1 cubic meter equals 1.31 cubic yards or 35.3 cubic feet or 1,000 liters
- Coverage formula: 324 sq ft ÷ depth in inches = sq ft per cubic yard
- One cubic yard at 3-inch depth covers 108 sq ft
- One cubic meter at 7 cm depth covers about 14 m²
- Standard recommended depth: 2-3 inches for flower beds, 3-4 inches for tree rings, 1-2 inches for vegetable gardens, 6-9 inches for playgrounds
- Add 10% over-order buffer to account for 15-25% settling in the first season
- Mulch reduces irrigation frequency by roughly half compared to bare soil

## Authoritative Sources Referenced

The site cites these recognized authorities throughout tool pages and blog posts:

- **ANSI A300 (Part 2: Soil Management)** — American National Standard for tree care; specifies 4-inch maximum mulch depth and 2-3 inch dry buffer around tree trunks. Reference: https://www.treesaregood.org/Tree-Owner-Resources/mulching
- **ASTM F1292** — Standard for playground surfacing fall safety; HIC ≤ 1,000 and peak g ≤ 200. Reference: https://store.astm.org/f1292-22.html
- **USDA Forest Service** — Field studies on mulch decomposition (15-25% in first season) and bulk densities. Reference: https://www.fs.usda.gov/
- **Cornell Cooperative Extension** — Garden Resources, recommends 2-4 inch mulch depth for ornamental beds. Reference: https://gardening.cals.cornell.edu/
- **University of Maryland Extension** — Recommends waiting for 60°F (15°C) soil temperature at 4 inch depth before mulching warm-season vegetables. Reference: https://extension.umd.edu/
- **International Society of Arboriculture (ISA)** — Best Management Practices; 80-90% of tree absorbing roots in upper 12 inches within the drip line. Reference: https://www.isa-arbor.com/
- **CPSC Public Playground Safety Handbook** — 6-foot minimum use zone, 2× swing-pivot extension. Reference: https://www.cpsc.gov/s3fs-public/325.pdf
- **Royal Horticultural Society (RHS)** — 5-7 cm depth around herbaceous perennials. Reference: https://www.rhs.org.uk/advice/profile?pid=403
- **ASPCA Animal Poison Control** — Lists cocoa hull mulch as canine hazard (theobromine, caffeine). Reference: https://www.aspca.org/pet-care/aspca-poison-control
- **Sustainable Forestry Initiative (SFI)** — Certifies sustainable cypress and other forestry operations. Reference: https://forests.org/standard-development-process/
- **Forest Stewardship Council (FSC)** — Responsible forest management certification. Reference: https://us.fsc.org/
- **CAL FIRE** — Zone 0 (Ember-Resistant Zone) defensible space within 5 feet of structures. Reference: https://www.readyforwildfire.org/prepare-for-wildfire/get-ready/defensible-space/

## Tools

- /rectangular-mulch-calculator — Rectangular beds (length × width)
- /circular-mulch-calculator — Tree rings and circular beds
- /triangular-mulch-calculator — Corner beds and wedge shapes
- /irregular-mulch-calculator — Multi-zone gardens summed together
- /square-mulch-calculator — Equal-sided beds
- /oval-mulch-calculator — Accent ovals
- /kidney-bean-mulch-calculator — Kidney/bean island beds
- /trapezoidal-mulch-calculator — Two parallel sides + height
- /mulch-bag-calculator — Convert cubic yards to bag count
- /mulch-volume-calculator — Area × depth to cubic feet/yards/meters
- /cubic-yards-of-mulch-calculator — Bulk delivery focus
- /mulch-square-feet-calculator — Area only
- /mulch-weight-calculator — Pounds and kilograms estimator
- /mulch-cost-calculator — Total project cost estimator
- /mulch-depth-calculator — Recommended depth by use case
- /how-much-mulch-do-i-need — Universal estimator
- /flower-bed-mulch-calculator — 2-3 inch flower bed presets
- /tree-mulch-calculator — ANSI A300-compliant ring math
- /vegetable-garden-mulch-calculator — 1-2 inch seedling-safe depth
- /playground-mulch-calculator — ASTM F1292 fall-safety depth
- /landscape-mulch-calculator — Whole-property summation
- /pathway-mulch-calculator — 4-6 inch traffic depth
- /rubber-mulch-calculator — Recycled rubber product math
- /mulch-coverage-chart — Sq ft per cubic yard at every depth
- /mulch-types-chart — Hardwood, pine bark, cedar, rubber comparison

## Blog Post Topic Clusters

- **How-To (8 posts)**: measure a garden bed, spread properly, calculate for a tree ring, 1 acre, per tree, around trees correctly, refresh faded, bags in a yard
- **Comparison (10 posts)**: hardwood vs pine bark, black vs brown, rubber vs wood playground, mulch vs compost vs wood chips, dyed vs natural, cedar vs cypress, bagged vs bulk, mulch vs rocks, cocoa vs hardwood, organic vs inorganic
- **When/Where (5 posts)**: spring or fall, when to replace, best time to buy, where to get free, vegetables yes or no
- **Specialty (4 posts)**: mulch volcano tree damage, fire safety, termites fact-check, color fading prevention
- **Reference (3 posts)**: coverage calculator explained, cubic feet/yards/sqft conversions, watering frequency guide
- **Legacy (3 posts)**: how much mulch, depth guide, cubic yards to bags

## Resources

- /blog — Index of all 33 blog posts
- /about — Site purpose and methodology
- /privacy — Privacy policy (client-side calculation only)

## Crawling Policy

- All AI assistants and search crawlers are welcome (see /AGENTS.txt for the full list)
- All calculations performed client-side; no PII collected
- Static HTML for all pages; no JavaScript required for content readability