Mulch Bags Calculator — How Many Bags You Need
Calculate how much mulch, topsoil, compost or gravel you need from area and depth — cubic yards, cubic feet, estimated weight and bags to buy.
Processed entirely in your browser — nothing you enter here is ever uploaded.
Result
About this tool
This page opens the calculator preset to mulch, with the bag count front and centre: enter your area (or length × width) and a depth — 2 to 4 inches is typical — and the tool tells you how many standard 2 cubic foot bags to buy, rounded up so you don't run out mid-job.
The bag count comes straight from the cubic feet figure: divide by 2 (the size of a standard mulch bag) and round up, because a partial bag still means buying a whole one. The same result is also shown in cubic yards and cubic feet in case your supplier sells mulch in bulk instead of bags, plus an estimated weight based on mulch's typical bulk density of roughly 350-450 lb per cubic yard — light and fluffy compared with soil or gravel.
This is the full calculator, just preconfigured for mulch — switch to topsoil, compost or gravel at any time, or change the depth for a thicker or thinner layer. Everything runs locally in your browser from static figures, with no uploads and no account needed.
Example. A 10 foot by 10 foot area at 3 inches of mulch returns 25.0 cubic feet, 0.93 cubic yards, 370 pounds, and 13 bags of 2 cubic feet.
Limit. Weight uses a single bulk density per material, 400 pounds per cubic yard for mulch, 2100 for topsoil, 1050 for compost, and 2850 for gravel.