Mulch Calculator
How much mulch you need — in cubic yards, bags, and dollars.
Your estimate
Estimates only. Renovate Cafe's calculators are a planning aid, not professional advice — double-check your inputs, confirm coverage on the product you buy, and verify quantities and local code for structural, electrical, or permitted work. Disclaimer.
Tell Renovate Cafe the size of your bed and how deep you want the mulch. You'll get the volume in cubic yards, how many bags that is, and a straight bulk-vs-bagged cost comparison so you buy the cheaper way.
How the mulch calculator works
Mulch is sold by volume, so the math is volume math. Your bed area is length × width. Multiply that by the depth (converted from inches to feet) and you have cubic feet. Divide by 27 and you have cubic yards — the unit bulk yards are sold in. Bags are just the cubic-foot total divided by the size of one bag.
A standard refresh is 2–3 inches. Going deeper than about 4 inches doesn't help the plants and can hold too much moisture against stems. For a brand-new bed over bare soil, 3 inches is the sweet spot for weed suppression.
Bulk or bags?
The break-even is almost always around 6–8 bags. Bagged mulch is convenient and clean, but you're paying for the bag and the handling. One cubic yard equals 13.5 bags of 2-cubic-foot mulch — so if you need a yard or more, bulk is usually a third of the price. The calculator shows both totals side by side so you can see the crossover for your own local prices.
A few practical notes: order about 10% extra if your bed is irregular or you want to top off thin spots, settle bulk mulch with a light watering, and keep mulch a couple of inches off trunks and stems to avoid rot.
Frequently asked questions
How many bags of mulch are in a cubic yard?
How deep should mulch be?
How much does a yard of mulch cover?
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