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Mulch Calculator

Find the volume of mulch for one garden bed in cubic yards, cubic feet and whole bags, then compare the bulk and bagged estimates. Enter feet or meters, inches or centimeters.

Every calculation runs in your browser. Nothing you type is sent anywhere.

By Mulch Measure · Last updated September 21, 2026

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15Calculators & guides

27 cu ftIn one cubic yard

324 sq ftOne yard covers at 1 inch

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What is a mulch calculator?

A mulch calculator turns the area you measured and the depth you want into a volume you can actually order. If you searched for a mulch estimator, it is the same tool under another name: it estimates volume, and the only inputs it needs are the measured area and the depth — everything else on this page follows from those two numbers.

A mulch calculator multiplies bed area by mulch depth to produce a volume, then converts that volume into the units a supplier sells: cubic yards for bulk, or whole bags for bagged mulch. The arithmetic is short — area × depth ÷ 12 = cubic feet and cubic feet ÷ 27 = cubic yards — but the failure point is almost always the measurement, not the math.

This site covers both halves. The calculator above handles one measured bed. The guides below handle the awkward parts: netting out a tree ring or path, translating a cubic-yard quote back into an installed depth, comparing a 1.5 cu ft bag against a 3 cu ft bag, and checking a dated price before you buy.

Quick facts about mulch volume

These are the constants every calculation on this site is built from.

One cubic yard is 27 cubic feet.
One cubic yard covers 324 sq ft at 1 inch deep, 162 sq ft at 2 inches, 108 sq ft at 3 inches, and 81 sq ft at 4 inches.
A 2 cu ft bag covers 24 sq ft at 1 inch, 12 sq ft at 2 inches, and 8 sq ft at 3 inches.
One cubic yard equals 13.5 bags of 2 cu ft, so you buy 14 whole bags.
Coverage per bag = label cubic feet × 12 ÷ depth in inches.
Bag counts round up because stores sell whole bags.

All calculators and guides

Fifteen tools and references, each answering one specific question.

Tool	What it answers	Type
Mulch Calculator	Volume for a rectangular or circular bed, in cubic yards, cubic feet and bag counts	Calculator	Open
How Many Bags of Mulch Do I Need?	Bag count from your area, your depth and the volume printed on the bag	Calculator	Open
What a 2 cu ft Bag Covers	Coverage grid for 1, 1.5, 2 and 3 cu ft bags at 1 to 4 inches deep	Reference	Open
Mulch for a Raised Bed	Bags and cubic yards for 4×4, 4×8, 4×12, 2×8 and 3×6 beds	Calculator	Open
Playground Mulch Calculator	CPSC depth guidance plus the 6-foot use zone around equipment	Calculator	Open
Rubber Mulch Calculator	Bags, cubic feet and yards for 0.8, 1.25, 1.5 and 2 cu ft rubber bags	Calculator	Open
What a Yard of Mulch Covers	One cubic yard at 1 to 6 inches, plus a reverse check on any quote	Reference	Open
Mulch Coverage Calculator	Subtracts a bare circle, then returns the exact net volume	Calculator	Open
How Much Mulch Do I Need?	Exact volume, plus what a supplier's quote really covers over your area	Calculator	Open
Pine Straw Calculator	Whole bales from the coverage figure your seller states	Calculator	Open
How Much Is a Yard of Mulch?	A dated bulk price check, compared per cubic foot	Price check	Open
Bags of Mulch in a Yard	1.5, 2 and 3 cu ft conversions, with the rounding shown	Reference	Open
Measure-to-Order Worksheet	The five-minute method, with an order checklist	Worksheet	Open
Home Depot Mulch Calculator Guide	Why the bag label matters more than a generic coverage rate	Guide	Open
Does Mulch Attract Termites?	What university extension research found, and the clearance rules	Guide	Open
Mulch vs Pine Straw	Coverage, cost basis, and where each material fits	Comparison	Open
How Much Does a Bag Weigh?	Bag weight by bag size, and why weight is the wrong number to order from	Guide	Open
How Deep Should Mulch Be?	What extension services publish, and what each depth adds to the order	Guide	Open
Data Downloads	Every coverage and price table on this site as a CSV	Data	Open

How to calculate mulch in three steps

The order matters. Measure first, choose a depth second, convert to the seller's unit last.

Measure the area that gets mulch

Multiply length by width for a rectangle, or use π × (diameter ÷ 2)² for a circle. Subtract paths, pots, tree openings, and any bare strip you plan to leave along a wall.

Choose the layer depth

Top-ups on existing mulch are commonly done at 2 to 3 inches, and new beds at 3 to 4 inches. Those are reference ranges, not rules — pick the depth your project actually needs.

Convert to what you are buying

Bulk is sold by the cubic yard; bags are sold whole. Convert to cubic feet first, then divide by the label volume of the bag or by 27 for yards, and round up.

Buying bagged mulch

The bag estimates above use the volume printed on the bag label, not the bag's weight — weight changes with material and moisture, while the label volume is what converts into covered area.

Frequently asked questions

How much mulch do I need?

Measure the area that will actually receive mulch, choose a depth in inches, then calculate area × depth ÷ 12 for cubic feet, or area × depth ÷ 324 for cubic yards. The calculator at the top of this page does both and adds bag estimates for 2 and 3 cubic-foot bags.

How many bags of mulch do I need?

Divide the required cubic feet by the volume printed on the bag, then round up to a whole bag. A 60 sq ft bed at 3 inches needs 15 cubic feet — that is 8 bags of 2 cu ft, or 5 bags of 3 cu ft. The bag count guide runs the calculation in both directions.

How much does a yard of mulch cover?

It depends entirely on depth: 324 sq ft at 1 inch, 162 sq ft at 2 inches, 108 sq ft at 3 inches, and 81 sq ft at 4 inches. See the full one-yard coverage table for depths up to 6 inches.

How many bags are in a cubic yard of mulch?

One cubic yard is 27 cubic feet, so it is 18 bags at 1.5 cu ft, 13.5 bags at 2 cu ft, or 9 bags at 3 cu ft. Because stores sell whole bags, the 2 cu ft answer is normally stated as 14 bags.

How deep should mulch be?

As a practical reference, previously mulched areas are often topped up at 2 to 3 inches and new mulched areas at 3 to 4 inches. These are reference ranges rather than rules; the calculator does not prescribe a depth for your project.

Is this a mulch coverage calculator?

Yes. It estimates the volume needed to cover one rectangular or circular area at the depth you enter. If you need to subtract a circular bare spot first, use the net coverage calculator.

Does mulch attract termites?

Two university extension programs say no. Iowa State University Extension answers no to both "does mulch attract termites" and "does mulch cause termites," and University of Maryland field research found termites beneath organic mulches, pea gravel, and bare soil at equal frequency. The termite guide lays out the findings and the clearance rules.