Mulch & Dirt Calculator | How Many Bags Do I Need?
Free mulch calculator, soil calculator, and topsoil calculator. Estimate bags and cubic yards—raised bed soil calculator, mulch estimator, and fill dirt calculator.
Area Shape
Units
Measured in feet.
Measured in feet.
Coverage Depth
Current: 3.0"
Range: 0.5" – 12" (step 0.5")
Bag Size (cubic feet)
Typical mulch bag sizes: 1.5 / 2.0 / 3.0 cubic feet.
Frequently Asked Questions
How do I calculate how much mulch I need?
To calculate how much mulch you need: measure the length and width of your area in feet, choose your depth in inches (e.g. 2–3" for mulch), then multiply length × width × (depth ÷ 12) to get cubic feet. Divide by your bag size (e.g. 2 cu ft) and round up for the number of bags. Our mulch calculator does this instantly and also shows cubic yards and pickup truck loads.
How much mulch do I need for my project?
Use our mulch estimator: enter your bed length, width, and depth. For weed control, 3" depth is common; for refreshing existing mulch, 1–2" is often enough. The mulch calculator gives you total bags (1.5, 2, or 3 cu ft) and mulch calculator yards so you can compare bagged vs. bulk delivery.
How does a mulch calculator in yards work?
A mulch calculator yards converts your area and depth into cubic yards. One cubic yard equals 27 cubic feet. Our tool shows both cubic yards and bag counts—so you can decide between buying bags or ordering a truckload. Enter length, width, and depth; we display results in real time.
How much topsoil do I need for a lawn or garden?
Use our topsoil calculator or soil calculator: enter the area and depth. For topsoil we add a 20% buffer for compaction and settling, so you order enough. The topsoil estimator shows bags (0.75, 1, or 1.5 cu ft) and cubic yards. Great for lawn dressing (e.g. 2") or top soil calculator needs.
How much soil do I need for a raised bed?
Use our raised bed soil calculator: select Soil Mode, choose the "Raised Bed (12")" depth preset, then enter the length and width of your bed. We add 20% for settling. You get total cubic yards, cubic feet, and bag counts so you know exactly how much soil to buy.
What is a fill dirt calculator and how do I use it?
A fill dirt calculator (or dirt calculator) estimates how much fill you need for low spots, grading, or backfill. Enter the area and depth; our soil calculator applies a 20% compaction buffer. Use it as a fill dirt calculator for bulk orders in cubic yards or as a soil calculator for bag estimates.