This mulch calculator turns your bed dimensions and target depth into cubic yards, cubic feet and bag counts. Enter the length and width (or the total square footage), pick a depth, and you will know whether to grab a few bags or order a bulk delivery.
If you only remember one number, make it this one: a cubic yard of mulch covers 324 square feet at 1 inch deep. At the standard 3-inch depth that same yard covers just 108 square feet, which is why beds swallow far more mulch than people expect.
Everything below is worked out from two conversions: 1 cubic yard is 27 cubic feet, and depth in inches divided by 12 gives depth in feet.
How to Figure Out How Much Mulch You Need
Figuring mulch comes down to three steps, and the calculator above does all of them:
1. Measure the bed area in square feet. Rectangles are length times width. For curved or irregular beds, break them into rectangles and circles and add the parts, or pace the perimeter and estimate. 2. Multiply area by depth in inches, then divide by 12. That gives cubic feet. 3. Divide cubic feet by 27 for cubic yards, or by the bag size for bag count.
As a worked example, a bed 20 feet by 10 feet at 3 inches deep:
- Area: 20 x 10 = 200 square feet
- Cubic feet: 200 x 3 / 12 = 50 cubic feet
- Cubic yards: 50 / 27 = 1.85 cubic yards
- In bags: 25 of the two-cubic-foot bags, or 17 of the three-cubic-foot bags
Order about 10% extra if the bed is irregular or the ground is uneven, since mulch settles into low spots and you will not get a perfectly even layer on the first pass.
How Many Bags of Mulch in a Yard?
The two-cubic-foot bag is the most common size in the US, and a cubic yard takes 13.5 of them. The three-cubic-foot bag, usual for bark nuggets and pine bark, takes exactly 9 per yard.
Pallet quantities vary by supplier and by how heavy the material is, so treat the pallet column as a guide and confirm before ordering. Roughly, one pallet is five cubic yards.
The practical threshold: once you need more than about a dozen bags, price bulk delivery. Thirteen bags is one yard, and one yard bagged usually costs more than one yard delivered loose.
| Bag size | Bags per cubic yard | Cubic yards per bag | Typical pallet |
|---|---|---|---|
| 1 cubic foot | 27 | 0.037 | — |
| 1.5 cubic feet | 18 | 0.056 | — |
| 2 cubic feet | 13.5 | 0.074 | 65 to 70 bags = 4.8 to 5.2 yd³ |
| 2.5 cubic feet | 10.8 | 0.093 | — |
| 3 cubic feet | 9 | 0.111 | 40 to 50 bags = 4.4 to 5.6 yd³ |
A cubic yard is 27 cubic feet, or 27 cu ft, so bags per yard is simply 27 divided by the bag size. Because 13.5 is not a whole number, 2 cu ft mulch bags never divide evenly into yards: 14 bags gives you slightly more than a yard, 13 slightly less.
How Much Does a Yard of Mulch Cover?
Coverage and depth are inversely proportional, so doubling the depth halves the area a yard covers. That single relationship explains most mulch ordering mistakes: a homeowner who covered 300 square feet with three yards last year at 3 inches will need six yards to do the same beds at 6 inches.
The quick mental formula for any depth is 324 divided by inches. At 1.5 inches that is 216 square feet per yard; at 5 inches it is about 65.
| Depth | One cubic yard covers | 100 sq ft needs | 200 sq ft needs | 500 sq ft needs |
|---|---|---|---|---|
| 1 inch | 324 sq ft | 0.31 yd³ (5 bags) | 0.62 yd³ (9 bags) | 1.54 yd³ (21 bags) |
| 2 inches | 162 sq ft | 0.62 yd³ (9 bags) | 1.23 yd³ (17 bags) | 3.09 yd³ (42 bags) |
| 3 inches | 108 sq ft | 0.93 yd³ (13 bags) | 1.85 yd³ (25 bags) | 4.63 yd³ (63 bags) |
| 4 inches | 81 sq ft | 1.23 yd³ (17 bags) | 2.47 yd³ (34 bags) | 6.17 yd³ (84 bags) |
Bag counts are two-cubic-foot bags, rounded up to whole bags. For coverage at any depth not listed, divide 324 by the depth in inches.
How Much Does Mulch Weigh?
Mulch is light for its volume, which is what makes hauling it practical. A full-size pickup bed will take 2 to 3 cubic yards of bark mulch by volume, and at 400 to 500 pounds a yard that is 800 to 1,500 pounds, within most half-ton payload ratings when the material is dry.
The same truck can only carry a third to half a yard of gravel or wet topsoil, because those run 2,400 to 2,900 pounds per yard. If you have hauled gravel and are judging mulch by that experience, you will badly underestimate how much fits.
Rubber mulch is the exception in every direction: two to three times heavier than bark per yard, unaffected by rain, and it does not decompose, so it never needs the annual top-up.
| Quantity | Dry weight | Wet weight | Notes |
|---|---|---|---|
| 2 cubic foot bag | 20 to 40 lb | 40 to 60 lb | Shredded hardwood at the heavy end, bark at the light end |
| 3 cubic foot bag | 30 to 60 lb | 60 to 90 lb | Usually bark nuggets, which are lighter per cubic foot |
| 1 cubic yard, bark | 400 to 500 lb | 800 to 1,000 lb | The lightest common mulch |
| 1 cubic yard, hardwood | 600 to 800 lb | 1,000 to 1,400 lb | Shredded hardwood holds a lot of water |
| 1 cubic yard, rubber | 1,200 to 1,500 lb | 1,200 to 1,500 lb | Does not absorb water, so weight barely changes |
Weights are typical ranges, not standards. Moisture content is the biggest variable and can nearly double the weight of an organic mulch, so weigh a delivery against your vehicle rating rather than these figures if you are close to a limit.
How Much Does Mulch Cost per Yard?
Mulch prices cross over between bulk and bagged at around one cubic yard:
- Bulk, collected yourself: about $20 to $40 per cubic yard
- Bulk, delivered: about $30 to $60 per yard, plus a delivery fee of $50 to $100 that is usually flat regardless of quantity
- Bagged: $3 to $6 per two-cubic-foot bag, which works out to $40 to $80 per cubic yard equivalent
- Dyed, cedar or cypress mulch: expect the upper end or above in both formats
The flat delivery fee is what drives the decision. On one yard, a $75 delivery fee doubles your cost and bags win easily. On five yards, the same fee adds $15 per yard and bulk wins by a wide margin.
Rough guide by project size:
- Under 1 yard, about 13 bags: buy bags
- 1 to 3 yards: compare directly, because bag sales change the answer
- Over 3 yards: order bulk, and one delivery saves dozens of trips with bags
Spring sales, typically several bags for a fixed price, can push bagged mulch below bulk pricing even at three or four yards. It is worth checking the week you buy.
How Deep Should Mulch Be?
Depth is a horticultural decision before it is a cost one:
- 1 inch: refreshing beds that already have mulch, after raking the old layer to break up any crust
- 2 inches: fine mulches such as shredded hardwood in beds with light weed pressure
- 3 inches: the standard recommendation for moisture retention and weed suppression
- 4 inches: coarse mulches like pine bark nuggets, or beds with heavy weed pressure
Do not go past 4 inches. Thick mulch starves roots of air, holds moisture against stems, and encourages rot. Keep mulch 2 to 3 inches clear of tree trunks and plant crowns. The cone of mulch piled against a trunk, sometimes called a mulch volcano, is the most common landscaping mistake there is, and it kills trees slowly enough that the cause is rarely blamed.
Organic mulch breaks down into the soil, so most beds lose about an inch a year and need a top-up rather than a full replacement.
What Is Mulch Made Of?
Mulch is any material spread over soil to hold moisture and block weeds. The common types behave differently enough that the choice affects your quantity:
- Shredded hardwood: the default in most of the US, mats together well on slopes, decomposes in one to two years
- Bark, shredded or nuggets: cedar, cypress and pine bark. Lighter, slower to break down, nuggets float in heavy rain
- Dyed mulch, usually black, brown or red: recycled wood coloured with iron oxide or carbon dye. Holds colour about a season
- Pine straw: very light, common in the southeast, needs a deeper layer for the same weed suppression
- Compost: heavier and richer, feeds the soil but suppresses weeds poorly on its own
- Rubber: recycled tyres, permanent, mostly used on playgrounds and in play areas rather than planting beds
- Straw and leaf mould: cheap and effective in vegetable beds, breaks down within a season
Coverage math is identical for all of them, since it depends only on volume. What changes is weight, how often you top up, and price.
Frequently Asked Questions
How many bags of mulch in a yard?
A cubic yard is 27 cubic feet, so it equals 13.5 of the common two-cubic-foot bags, 9 of the three-cubic-foot bags, or 18 of the 1.5-cubic-foot bags. Since 13.5 is not a whole number, 14 two-cubic-foot bags gives you slightly more than a yard.
How much mulch do I need?
Multiply the bed area in square feet by the depth in inches, divide by 12 for cubic feet, then divide by 27 for cubic yards. A 200-square-foot bed at 3 inches deep needs 50 cubic feet, which is 1.85 cubic yards or 25 two-cubic-foot bags.
How much does a yard of mulch cover?
One cubic yard covers 324 square feet at 1 inch deep, 162 square feet at 2 inches, 108 square feet at the standard 3 inches, and 81 square feet at 4 inches. For any other depth, divide 324 by the depth in inches.
How many cubic feet in a yard of mulch?
Twenty-seven. A cubic yard is 3 feet by 3 feet by 3 feet, and 3 x 3 x 3 is 27 cubic feet. That conversion is the same for mulch, soil, gravel or concrete, since it is a unit of volume rather than a property of the material.
How much does a yard of mulch weigh?
Typically 400 to 500 pounds for bark mulch and 600 to 800 pounds for shredded hardwood when dry. Rain can nearly double that, so a soaked yard of hardwood can reach 1,400 pounds. Rubber mulch is much heavier at 1,200 to 1,500 pounds per yard and does not change with rain.
How much does a bag of mulch weigh?
A two-cubic-foot bag runs about 20 pounds for bark and up to 40 pounds for shredded hardwood. A three-cubic-foot bag is usually 30 to 60 pounds. Bags stored outdoors after rain can weigh half again as much, which is worth knowing before loading a car.
How much is a yard of mulch?
Roughly $20 to $40 per cubic yard collected yourself, or $30 to $60 delivered plus a delivery fee of $50 to $100. Bagged mulch works out to $40 to $80 per cubic yard equivalent at $3 to $6 per two-cubic-foot bag. Dyed, cedar and cypress mulches sit at the top of those ranges.
How many bags of mulch on a pallet?
Usually 65 to 70 two-cubic-foot bags, which is about 4.8 to 5.2 cubic yards, or 40 to 50 three-cubic-foot bags. Pallet counts vary by supplier and by material weight, so confirm the count before ordering a full pallet.
How deep should mulch be to stop weeds?
Three inches is the sweet spot for most beds: deep enough to block light from weed seeds and hold soil moisture, shallow enough not to suffocate roots. Use 4 inches only with coarse mulches like bark nuggets, and never pile mulch against trunks or stems.
How much mulch do I need for 100 square feet?
At 3 inches deep, 100 square feet needs 25 cubic feet, which is 0.93 cubic yards, 13 two-cubic-foot bags or 9 three-cubic-foot bags. At 2 inches it drops to about 17 cubic feet, or 9 two-cubic-foot bags.
What is mulch made of?
Most mulch is shredded wood or bark, often hardwood, cedar, cypress or pine. Dyed mulch is recycled wood coloured with iron oxide or carbon. Other common materials are pine straw, compost, straw, leaf mould, and recycled rubber for playgrounds. Coverage math is the same for all of them because it depends only on volume.
When is the best time to mulch?
Mid to late spring, once the soil has warmed. Mulching too early keeps the soil cold and delays growth. A lighter top-up in autumn insulates roots over winter. Most beds lose about an inch a year to decomposition, so an annual refresh is enough rather than a full replacement.