70 bags of mulch equals roughly 13 to 18 cubic yards, depending on bag size

The answer depends on which bag size you bought. Most bags sold at garden centers are either 2 cubic feet or 3 cubic feet. Since one cubic yard contains 27 cubic feet, a pallet of 70 bags in 2-cubic-foot bags gives you about 140 cubic feet total — roughly 5.2 cubic yards. The same 70 bags in 3-cubic-foot size yields about 210 cubic feet, or 7.8 cubic yards.

If you bought a mix of sizes, or if your bags are labeled by weight rather than volume, the math shifts. A 40-pound bag of mulch typically holds about 2 cubic feet; a 2-cubic-yard bulk delivery contains roughly 54 of those bags. Check your receipt or the bag itself for the cubic footage — it is printed on the label, usually near the bottom.

Key Takeaways

  • Seventy 2-cubic-foot bags equal about 5.2 cubic yards; seventy 3-cubic-foot bags equal about 7.8 cubic yards.
  • The cubic footage is printed on every bag label, so you can calculate your exact total by multiplying bag size by 70 and dividing by 27.
  • Mulch settles and compacts over time, so you will need more material than your initial calculation suggests if you want the same depth a year later.
  • Coverage depth matters as much as total volume — 2 inches deep requires less mulch than 4 inches deep over the same square footage.

How to find the bag size on your receipt or label

The cubic footage appears on the front or back of the bag in large text. Look for a number followed by "cu. ft." or "cubic feet." If you bought from a big-box store, your receipt may also list it under the product description. If you bought in bulk and the bags are unlabeled, weigh one — a standard 2-cubic-foot bag weighs around 40 pounds; a 3-cubic-foot bag runs 50 to 60 pounds depending on moisture content.

Do not rely on the bag's weight alone to calculate volume, because mulch density varies by type and moisture. Hardwood mulch, cedar mulch, and dyed mulch all weigh differently at the same volume. The cubic footage printed on the bag is your most reliable number.

Why your mulch will not cover as much next year

Mulch compacts and breaks down. Within the first year, a 4-inch layer of fresh mulch will settle to about 2 to 3 inches as it absorbs water and the pieces compress under their own weight. Organic mulch also decomposes — it turns into soil. This means that if you want to maintain the same visual depth and coverage, you will need to add fresh mulch annually, usually at a rate of 1 to 2 inches per year depending on your climate and mulch type.

Plan to refresh your beds every spring or fall. A rough rule: if you used 70 bags to reach 4 inches deep the first year, you will need 20 to 35 bags the following year just to restore that depth. Inorganic mulch like rubber or stone does not break down, so it holds its depth longer — but it also does not improve your soil the way organic mulch does.

Calculating coverage for your specific bed size

To know whether 70 bags is enough for your space, work backward from your bed dimensions. Measure the length and width of each bed in feet, multiply them together to get square footage, then decide on your target depth — 2, 3, or 4 inches is standard. Use this formula: (square feet × depth in inches) ÷ 324 = cubic yards needed.

For example, a bed that is 10 feet long and 5 feet wide is 50 square feet. At 3 inches deep, you need (50 × 3) ÷ 324 = 0.46 cubic yards. If your 70 bags total 7.8 cubic yards, you could cover that single bed and still have material left for 16 more beds of the same size. Most homeowners underestimate how much space a cubic yard actually covers — it is enough for roughly 100 square feet at 3 inches deep.

Comparing 70 bags to bulk mulch delivery

Buying 70 individual bags costs more per cubic yard than ordering a bulk delivery, which is usually priced by the cubic yard and delivered by truck. A bulk yard typically costs $25 to $50 depending on mulch type and your location; 70 bags at $3 to $5 each runs $210 to $350 before tax. However, bulk delivery has a minimum order (often 3 to 5 yards) and a delivery fee ($50 to $150), so it only makes sense if you need at least 8 to 10 cubic yards.

For smaller projects — under 5 cubic yards — bags are often the practical choice because you avoid the delivery fee and minimum order. For larger projects, bulk is cheaper and saves you the labor of opening and spreading 70 individual bags. If you are somewhere between, calculate both routes and compare the total cost, not just the per-unit price.

What happens if you have leftover mulch

Mulch stores well if kept dry. Stack unopened bags in a garage, shed, or under a tarp for use next season. Opened bags dry out faster, so if you have loose mulch left over, pile it in a corner of your yard and cover it with a tarp to keep it from drying into a hard cake. Mulch that has dried completely can be rehydrated by soaking it with a hose before spreading, though it will not be as straightforward to work with as fresh material.

If you have no storage space, many garden centers will take back unopened bags within a set window (usually 30 days) for a refund or store credit. Check your receipt for the return policy before you buy.

Frequently Asked Questions

How do I know if I bought 2-cubic-foot or 3-cubic-foot bags?

Check the bag label — the cubic footage is printed on the front or back. If you have already opened the bags and lost the labels, weigh one. A 2-cubic-foot bag is typically 40 pounds; a 3-cubic-foot bag is 50 to 60 pounds. You can also call the store where you bought them and give them the product name or SKU from your receipt.

Will 70 bags be enough for my whole yard?

It depends on your yard size and how deep you want the mulch. Seventy 3-cubic-foot bags cover roughly 780 square feet at 3 inches deep. If your beds total less than that, you have enough. If they total more, you will need additional bags. Measure your bed dimensions and use the formula in the "Calculating coverage" section above to know for certain.

Can I mix different mulch types together?

Yes. Mixing types does not harm plants or soil. However, different mulches settle and break down at different rates, so your bed may look uneven over time. If appearance matters, keep types separate or blend them thoroughly as you spread so the color and texture are consistent throughout.

What is the difference between mulch sold by weight and mulch sold by volume?

Volume (cubic feet) tells you how much space the mulch occupies; weight tells you how heavy it is. Volume is what matters for coverage. A bag labeled "40 pounds" does not tell you whether it is 2 or 3 cubic feet — you need the cubic footage printed on the label. Weight varies based on moisture content, so two bags of the same volume can weigh differently.