Mulch Calculator
Find out how much mulch you need for your garden beds and estimate the cost.
How much mulch do I need for my garden beds?
Mulch volume is calculated by multiplying the total bed area by your desired depth, converting inches to feet, and then dividing by 27 to get cubic yards — the unit bulk mulch is typically sold in at landscaping supply yards. A 2-3 inch depth is standard for most garden beds, providing good weed suppression and moisture retention without smothering plant roots, while 4 inches is sometimes used for weed-heavy areas or around trees.
Should I buy mulch in bulk or in bags?
Buying mulch in bulk by the cubic yard is almost always cheaper per unit than buying bagged mulch, especially for larger areas, but it requires a truck or delivery and somewhere to pile it before spreading. Bagged mulch (usually sold in 2 cubic foot bags) is more convenient for small beds or if you don't have bulk delivery access. This calculator shows both the bulk cubic yard figure and the equivalent number of 2 cubic foot bags so you can compare options.
These are planning estimates only — actual mulch pricing varies by type (hardwood, cedar, rubber, dyed), region, and supplier, and it's wise to order a little extra since mulch settles over time.
Frequently Asked Questions
How deep should mulch be in a garden bed?
Most garden beds benefit from 2-3 inches of mulch, which suppresses weeds and retains soil moisture without suffocating plant roots. Avoid piling mulch directly against tree trunks or plant stems, and consider 4 inches only in particularly weedy or exposed areas.
How many bags of mulch equal one cubic yard?
Standard mulch bags hold 2 cubic feet, and one cubic yard equals 27 cubic feet, so it takes about 13-14 bags to equal one cubic yard. Buying bulk mulch by the yard is usually cheaper for larger areas than buying that many individual bags.
Is bulk mulch cheaper than bagged mulch?
Yes, bulk mulch purchased by the cubic yard is typically cheaper per unit of coverage than bagged mulch, especially once you need more than a few cubic yards. Bagged mulch is more convenient for small beds or when you lack a truck for bulk delivery.
How often should I replace or refresh mulch?
Organic mulch like hardwood or bark typically breaks down and needs topping off every 1-2 years, while inorganic options like rubber mulch can last much longer without replacement. Adding a thin fresh layer annually usually keeps beds looking sharp.
What type of mulch is best for my garden?
Hardwood and bark mulch are popular all-purpose choices, cedar naturally repels some insects, and rubber mulch lasts the longest but doesn't improve soil health like organic mulches do as they decompose. Choice often comes down to appearance preference, budget, and how much soil-building benefit you want.
Should I buy extra mulch beyond the calculated amount?
It's wise to order 5-10% extra since mulch settles and compacts over the first few weeks after spreading, and irregular bed shapes can use slightly more than a flat square-footage calculation suggests.
How much does mulch cost per cubic yard?
Bulk mulch typically runs $25-$50 per cubic yard depending on type and region, with premium dyed or specialty mulches costing more. Enter your local supplier's quoted price above for a more precise total cost estimate.
How accurate is this mulch estimate?
This calculator provides a solid planning estimate based on your bed area, chosen depth, and cost input, but actual mulch pricing, bag sizes, and delivery fees vary by supplier and region, so treat this as a helpful starting point.