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Mulch Calculator

How much mulch do I need? Enter bed area and depth for instant cubic yards, bag count, wheelbarrow loads, and optional cost for garden beds and landscaping.

Tip: measure the full area you plan to cover, including beds, paths, and under trees, then choose your depth.

Typical: 2-4 in. Do not exceed 4 in.

Extra for settling and uneven surfaces.

Price per bag · Price per yd³ bulk

Coverage Per Bag

How far one bag covers at common depths. Updates when you change bag size or unit system.

Depth Coverage Alt. units

Actual spread varies with mulch chunk size and compaction. Add 5-10% extra.

Mulch Planning Checklist

Covers bed preparation, edging, depth confirmation, delivery access, and spreading sequence before ordering.

Download Checklist (PDF)

Planning reference only. See Methodology and Data Sources. View all project checklists →

Mulch Calculator: Cubic Yards, Bags & Coverage Guide

This calculator estimates mulch volume and bag count for any garden bed, path, or landscaping area. Enter your dimensions and target depth to get cubic yards, bags, wheelbarrow loads, and optional pricing for both bagged and bulk mulch.

Recommended mulch depths

A light refresh or topdress needs 2 inches (50 mm). Standard garden beds use 3 inches (75 mm), which is the most common depth and gives a good balance of weed suppression and water retention without suffocating roots. New beds or areas with heavy weed pressure benefit from 4 inches (100 mm). Around trees, keep mulch to 2-4 inches and pull it back 2-3 inches from the trunk flare to prevent crown rot.

Mulch buying tips

Bulk mulch is typically cheaper than bags for anything over 2-3 cubic yards. Use the pricing fields in the calculator to compare bag vs bulk cost for your specific project. Order 5-10% extra to cover settling and uneven surfaces. Mulch breaks down over time and enriches the soil, so topping up annually is worth the effort. Never pile mulch against plant stems or tree trunks.

Frequently Asked Questions

Multiply bed area × depth in feet ÷ 27. For a 200 sq ft bed at 3 inches: 200 × 0.25 ÷ 27 = 1.85 cubic yards. Add 10% waste = about 2 yards to order. Enter your dimensions above for an instant result in both yards and bags.
One cubic yard = 27 cubic feet. At 2 cu ft bags: approximately 14 bags per yard. At 3 cu ft bags: 9 bags. A 200 sq ft bed at 3 inches (1.85 yd³) needs about 26 bags of 2 cu ft or 17 bags of 3 cu ft.
At 3 inches deep: one 2 cu ft bag covers approximately 8 sq ft. At 2 inches: 12 sq ft. At 4 inches: 6 sq ft. See the coverage chart above , it updates when you change bag size or units.
Use 2-3 inches for topdressing established beds. Use 3-4 inches for new beds or heavy weed suppression. Do not exceed 4 inches. Always pull mulch back 2-3 inches from plant stems and tree trunks to prevent rot.
At 3 inches deep: 1,000 sq ft × 0.25 ft ÷ 27 = 9.26 cubic yards. Add 10% waste = approximately 10.2 yards to order. At 2 inches: 6.2 yards. At 4 inches: 12.3 yards. At 3 cu ft bags: about 83 bags needed.
No. Mulch is sold by volume, not weight. Weight varies significantly with wood type and moisture content, so volume (cubic yards or cubic feet) is the reliable basis for ordering. Bulk mulch is measured in cubic yards; bagged mulch is measured in cubic feet per bag.

Related Landscaping Calculators

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Disclaimer: Estimates are for general planning only. Actual quantities vary with mulch type, compaction, and surface conditions. Always confirm with your supplier before ordering.

See Methodology and Data Sources for details.