Mulch Calculator
Estimate mulch volume in cubic yards, cubic feet, cubic meters, and bags.
What this calculator does
Bed area is multiplied by depth and the extra allowance.
Mulch volume
Use average width for curved beds, or split the bed into simple rectangles.
Your plan updates instantly
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Bed area x depth x extra allowance; bag count rounds up.
The arithmetic uses the exact values shown above. Verify field measurements, product pack sizes, layout constraints, and local requirements before ordering or building.
How to interpret the result
Bed area is multiplied by depth and the extra allowance.
How the result is calculated
Volume = length x width x depth x (1 + extra %).
Worked example
A 20 x 8 ft bed at 3 in deep needs about 1.56 yd3 at 5% extra.
Practical guidance
- Measure the project at least twice before ordering.
- Use actual product dimensions and package coverage.
- Keep a saved or printed copy of the inputs used for the estimate.
Assumptions and limitations
Curves, settling, existing mulch, plant displacement, and supplier scoop sizes can vary.
Methodology
Calculations use standard geometry and normalized units. Countable products are rounded up where partial products cannot normally be purchased.
Read the complete calculation methodology and testing policy.
Frequently asked questions
Are results rounded for purchasing?
Countable materials and packages are rounded up. Measured area, length, volume, and cost remain decimal values where appropriate.
Is this a final construction specification?
No. It is a transparent planning estimate. Verify product instructions, site conditions, plans, and local requirements.