Mulch Calculator

Calculate exactly how much mulch you need for garden beds, landscaping borders, tree rings, and pathways. Enter your area dimensions and target mulch depth to get results in cubic yards for bulk delivery and bag counts for store purchases. Most landscapers recommend 2 to 3 inches of mulch for established beds and 3 to 4 inches for new beds — enough to suppress weeds and retain moisture without smothering plant roots. Bulk mulch is significantly cheaper per cubic yard than bagged for areas over 100 square feet.

Enter Your Measurements

Bed Length(ft)

Bed Width(ft)

Mulch Depth(in)

Results

Mulch Needed

1.85

cubic yards

2 cu ft Bags

bags

Bed Area

200

sq ft

Volume

50.0

cubic feet

Cost Estimate

Cost per cubic yard

per cubic yard

Estimated Cost

$64.81

Formula

Cubic Yards = (Length × Width × Depth ÷ 12) ÷ 27

How to Use This Calculator

How to Use

1
Measure the length and width of each garden bed in feet — for curved or irregular beds, estimate the average length and width.
2
Choose your target mulch depth: 2 inches for top-dressing established beds, 3 inches for general use, and 4 inches for weed suppression in new beds or pathways.
3
View results in cubic yards (for bulk delivery orders) and in 2 cubic foot bag counts (the most common bag size at home improvement stores).
4
For multiple separate beds, calculate each one individually and add the cubic yard totals together before ordering.

Frequently Asked Questions

How much mulch do I need for 100 square feet?

For 100 square feet at 2 inches deep, you need 0.62 cubic yards or about 8.5 bags (2 cu ft bags). At 3 inches deep, you need 0.93 cubic yards or about 13 bags. At 4 inches deep, you need 1.23 cubic yards or about 17 bags. The formula is: square footage times depth in inches, divided by 324, which gives cubic yards directly.

How many bags of mulch equal a cubic yard?

One cubic yard equals 27 cubic feet. Since the most common bag size at hardware stores is 2 cubic feet, you need 13.5 bags (round up to 14) to equal one cubic yard. Some stores sell 3 cubic foot bags, which means you'd need 9 bags per yard. When comparing prices, divide the bulk price per cubic yard by 13.5 to see the equivalent per-bag price — bulk is almost always much cheaper.

What is the best mulch depth?

For established garden beds with existing plants, 2 to 3 inches is ideal — enough to suppress weeds and retain moisture without compacting and blocking air circulation to roots. For new beds, pathways, or areas with aggressive weeds, 3 to 4 inches provides stronger weed suppression. Never pile mulch against tree trunks or plant stems, as this traps moisture and promotes rot and disease. Keep mulch 2 to 3 inches away from all stems and trunks.

Is it cheaper to buy bulk or bagged mulch?

Bulk mulch is typically 40 to 60 percent cheaper per cubic yard than bagged mulch for the same product. At a typical home improvement store, bagged hardwood mulch costs around $5 to $7 per 2 cubic foot bag, which works out to $67 to $95 per cubic yard. Bulk mulch delivered from a landscaping supplier usually costs $25 to $50 per cubic yard. For any project over 3 to 4 cubic yards (roughly 400 square feet at 3 inches), bulk delivery will save you significant money.

How often should I replace mulch?

Shredded wood mulch and hardwood bark mulch typically last 1 to 2 years before it decomposes enough to need refreshing. Pine bark nuggets can last 2 to 3 years because the larger pieces decompose more slowly. Inorganic mulches like rubber or stone last 5 to 10 years or more but don't improve soil quality. Rather than fully removing old mulch each year, most landscapers simply add a fresh 1-inch top-up layer to restore color and weed suppression, which is cheaper and less labor-intensive.

In-Depth Guides

📖

How Much Mulch Do You Need? Coverage & Cost Guide

Find out exactly how many cubic yards or bags of mulch to buy. Covers coverage at different depths, mulch types, bulk vs. bagged cost comparison, and application tips.

📖

How Much Topsoil Do You Need? Cubic Yards & Coverage Guide

Calculate topsoil for gardens, lawns, and raised beds. Learn how deep to apply it, bulk vs bagged costs, and how to amend poor soil.

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About This Calculator

This calculator uses the formula: Cubic Yards = (Length × Width × Depth ÷ 12) ÷ 27. All calculations follow industry-standard methods. Results are estimates — always verify with a licensed professional for structural or code-compliant work.

Built and maintained by the CalcSmart team. Last updated March 2026.

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