30 bags of mulch covers roughly 7.5 to 10 cubic yards, depending on bag size

The answer depends on which bag size you bought. A standard 2 cubic foot bag — the most common size at big-box stores — means 30 bags equal 60 cubic feet, which converts to about 2.2 cubic yards. A 3 cubic foot bag (also common) gives you 90 cubic feet or roughly 3.3 cubic yards. If you bought larger contractor bags at 5 cubic feet each, 30 bags equal 150 cubic feet or about 5.6 cubic yards.

Check your receipt or the bag itself for the cubic footage printed on the label. That number is what matters. Once you know it, multiply by 30 and divide by 27 (the number of cubic feet in one yard) to get your total yardage.

Key Takeaways

  • Thirty 2 cubic foot bags equal about 2.2 cubic yards; thirty 3 cubic foot bags equal about 3.3 cubic yards.
  • The cubic footage is printed on every bag — check the label before calculating your total.
  • Depth matters as much as yardage: 2 cubic yards spread 2 inches deep covers roughly 1,300 square feet, but 4 inches deep covers only 650 square feet.
  • Mulch settles and compacts over time, so you may need more than your initial calculation suggests for year-round coverage.

How to find the cubic footage on your bag

The cubic footage is always on the front or back of the bag, usually in large print near the brand name or weight. It will say something like "2 cu ft" or "3 cu ft" or "5 cu ft". If you bought bags from different stores or at different times, check each one — sizes vary by retailer and brand.

If you cannot find the label or the bag is damaged, measure the bag itself. Multiply length × width × height in inches, then divide by 1,728 (the number of cubic inches in one cubic foot). This gives you the approximate cubic footage, though it will be slightly less than the stated amount because bags are not packed solid.

Converting bags to square footage coverage

Yardage alone does not tell you how much ground you will cover. You also need to know your desired depth. Mulch is typically spread 2 to 4 inches deep — 2 inches for maintenance, 3 to 4 inches for new beds or weed suppression.

Use this rough guide: one cubic yard covers about 325 square feet at 1 inch deep, 162 square feet at 2 inches deep, and 108 square feet at 3 inches deep. So if you have 3 cubic yards and want 2-inch depth, you can cover roughly 486 square feet (3 × 162). Measure your bed length and width, multiply them together, and compare to this number to see if 30 bags is enough.

Why bag size matters when you shop

Stores price mulch by the bag, not by the yard, so a larger bag looks more expensive upfront but gives you more material per dollar. A 2 cubic foot bag might cost $3 to $5, while a 3 cubic foot bag costs $4 to $7. The 3 cubic foot bag is usually the better value if you need volume.

Contractor bags (5 cubic feet or larger) are sold at landscape supply yards and some home improvement stores. They cost $8 to $15 per bag but are worth buying if you need more than 20 bags, because the per-yard cost drops significantly. For 30 bags, compare the total cost of small bags against contractor bags before you decide.

Mulch settles over time — plan for refill

Fresh mulch looks thick and full when you first spread it. Over 6 to 12 months, it settles, compacts, and breaks down. You may lose 20 to 30 percent of your depth by the end of the first year, especially in rainy climates where decomposition is faster.

If you spread 30 bags at 3 inches deep this spring, you might need to add 10 to 15 bags the following spring to maintain that depth. Plan your budget accordingly, and do not assume one load will last two years unless you are in a dry climate or using dyed mulch, which breaks down more slowly than natural wood chips.

Mulch types and how they affect coverage

Standard wood chip mulch, shredded hardwood, and dyed mulch all come in the same bag sizes, so yardage is the same. The difference is in longevity and appearance. Shredded hardwood lasts longer than wood chips and breaks down more slowly. Dyed mulch (usually red or brown) is cosmetic and breaks down at a similar rate to natural mulch but looks uniform longer.

Cypress and cedar mulches are more expensive and last longer — sometimes 2 to 3 years before significant settling. If you are buying premium mulch, you may not need to refill as often, which can offset the higher per-bag cost over time.

Frequently Asked Questions

How do I convert 30 bags to cubic yards if the bags don't say cubic feet?

Weigh the bag if the weight is printed on it. Most 2 cubic foot bags weigh 40 to 50 pounds, 3 cubic foot bags weigh 60 to 75 pounds, and 5 cubic foot bags weigh 100 to 120 pounds. If you know the weight, you can estimate the cubic footage, though this method is less accurate than reading the label directly.

Can I mix different bag sizes and still calculate my total yardage?

Yes. Add up the cubic footage of all bags (2 cu ft + 3 cu ft + 5 cu ft, for example), then divide by 27 to get total cubic yards. Just make sure you are reading the label on each bag type you bought.

Is 30 bags enough for a typical garden bed?

It depends on the bed size. A 4-by-8-foot bed (32 square feet) needs about 0.25 cubic yards for 2-inch depth, so 30 bags of 2 cubic foot mulch would cover roughly 220 such beds. For a typical residential landscape with multiple beds totaling 500 to 1,000 square feet, 30 bags of 2 cubic foot mulch covers that area at 2 inches deep.

Should I buy more bags than I calculate to account for settling?

If you want to maintain your desired depth through the first year without refilling, add 20 to 25 percent to your calculated amount. So if you calculate you need 30 bags, buy 36 to 38 bags instead. This is especially important in wet climates where mulch breaks down faster.