Mulch & Soil Calculator
Bags of mulch or soil.
Bags of mulch or soil.
How to use Mulch & Soil Calculator
- Enter your bed length and width, or a total area
- Set the mulch depth in inches and your bag size
- Read the cubic yards needed and number of bags to buy
About Mulch & Soil Calculator
How much mulch you need comes down to three numbers: the area you're covering, how deep you want the layer, and the size of the bags you're buying. This mulch calculator takes all three. Enter a bed's length and width, or type in a total area if the shape is irregular, set your depth in inches, and choose your bag size. It instantly returns the volume in both cubic feet and cubic yards, plus the exact number of bags rounded up so you don't drive home short.
Because it reports cubic yards as well as cubic feet, it doubles as a yardage calculator when you're ordering mulch in bulk by the yard instead of by the bag. Match the bag size field to whatever you're actually buying — the 2-cubic-foot bags common at Home Depot and Lowe's, the smaller bags rubber mulch often ships in, or a bulk amount — and the bag count updates to match. The same volume math covers any material: wood chips, bark, straw, or rubber mulch all calculate the same way once you know your depth and coverage area. Switch dimensions between feet and meters with the units selector.
It's completely free, with no sign-up, no limits, and no ads to click through. Every calculation runs entirely in your browser, so nothing you type is ever uploaded or stored on a server.
Frequently asked questions
- How much mulch do I need?
- Multiply your bed area (length times width) by the mulch depth to get the volume. This calculator does it for you: enter the dimensions and depth, and it returns the cubic feet, cubic yards, and the number of bags to buy. A 3-inch depth over 100 square feet needs about 25 cubic feet, roughly 1 cubic yard.
- How many yards of mulch do I need?
- Enter your bed area and depth, and the calculator reports the total in cubic yards alongside cubic feet. Mulch is usually sold by the cubic yard when you order in bulk, so this is the number to give a supplier. As a rough guide, one cubic yard covers about 100 square feet at a 3-inch depth.
- How deep should mulch be?
- For most garden beds, 2 to 3 inches is ideal. Go 3 to 4 inches if you want stronger weed suppression and moisture retention. Avoid piling mulch against plant stems or tree trunks. Enter your chosen depth in inches and the calculator handles the rest.
- How much area does a bag of mulch cover?
- Coverage depends on depth. A 2-cubic-foot bag covers about 12 square feet at 2 inches deep, or roughly 8 square feet at 3 inches. Enter your area and depth and the calculator shows how many bags that coverage requires.
- How many bags of mulch are in a cubic yard?
- One cubic yard equals 27 cubic feet. So a cubic yard is about 13 to 14 bags of 2 cubic feet, or 9 bags of 3 cubic feet. This tool divides your total volume by your chosen bag size and rounds up so you never come up short.
- What bag size should I use for Home Depot or Lowe's mulch?
- Bagged mulch at Home Depot and Lowe's is most often sold in 2-cubic-foot bags, so set the bag size to 2 to match. If you're buying a different size, just enter that number instead. The bag count always rounds up, so a partial bag still counts as one.
- Can I use this as a rubber mulch calculator?
- Yes. Rubber mulch is measured the same way as wood mulch — area times depth — so the volume and coverage results apply directly. Rubber mulch bags are often smaller than wood mulch bags, so check the bag and enter its cubic-foot size to get an accurate bag count.
- How do I calculate mulch for a round or oddly shaped bed?
- Measure or estimate the total square footage of the bed and enter it in the total area field instead of a length and width. The calculator then applies your depth and bag size to that area, which is handy for circles, curves, and irregular borders.
- Is this mulch calculator free?
- Yes, it is 100% free with no account, no sign-up, and no usage limits. You can run as many calculations as you need.
- Can I use meters instead of feet?
- Yes. Use the Units selector to switch your bed dimensions or total area between feet and meters. The calculator converts everything internally and still reports the mulch volume in cubic feet and cubic yards, the standard units used for buying mulch.
- Is my data uploaded or stored anywhere?
- No. Every calculation happens locally in your browser. Nothing you enter is sent to a server, saved, or shared, so your project details stay completely private.