Mulch Calculator
Estimate mulch, compost, soil, or gravel by bags, cubic yards, or cubic meters
Labels the estimate; volume math stays the same.
Long side of the bed.
Short side of the bed.
Distance across the round bed.
Use this when the bed area is already measured.
Planned material depth.
Adds settling and touch-up material.
Volume in one bag or sack.
Optional price per bag.
Optional bulk material price.
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How This Mulch Calculator Works
Area times depth gives volume, then waste and packaging are applied.
Measure the bed
Use rectangle mode for straight beds, circle mode for round beds, or known area when a plan already gives square feet or square meters.
Set the depth
Depth converts to feet or meters before calculating volume. A 3 inch layer is one quarter of a foot.
Compare buying options
The calculator shows whole bags and bulk volume so small and large projects can be compared before ordering.
Mulch Calculator Examples
Common bed sizes and material planning scenarios.
3 inches deep with 10% waste needs about 1 cubic yard or 14 two-cubic-foot bags.
8 cm deep with 10% waste needs about 0.88 cubic meters or 18 fifty-liter bags.
Enter the diameter across a round bed and the calculator uses circle area before depth.
Mulch Calculator FAQ
Practical answers for depth, waste, bags, bulk ordering, and material types.
How deep should mulch be?
A 2 to 3 inch mulch layer is common for many beds. Use less around trunks and stems, and avoid piling mulch directly against plants.
Should I buy mulch by bags or cubic yards?
Small beds are often easier with bags. Larger projects are usually cheaper in bulk, so the calculator shows both bag count and bulk volume.
What waste allowance should I use?
Use 5% to 10% for simple beds. Increase it for uneven ground, irregular shapes, settling, or if you want extra material for touch-ups.
Can I use this for compost, soil, or gravel?
Yes. The volume math is the same. The material selector labels the estimate, while depth, area, bag size, and price drive the result.
Why does a bag estimate leave extra material?
Bags are sold as whole units, so the calculator rounds up. The extra material is the difference between the whole bags purchased and the exact volume needed.