Mulch Calculator
Mulch calculator: find cubic yards and 2 cubic foot bags of mulch for a garden bed from its size and depth.
Editorial review: Farrow (pseudonym; identity and professional credentials are not disclosed). This page is for educational purposes, not professional advice.
Updated
Your inputs
Results update as you type. Nothing you enter leaves your device.
Results
- 2 cu ft bags
- 20
- Bagged cost
- $90.00
- Bed area
- 160 sq ft
Example with the starting values
These results use the calculator's initial inputs. Change the values above to calculate your own estimate.
Inputs
- Bed length
- 20 ft
- Bed width
- 8 ft
- Depth
- 3 in
- Price per 2 cu ft bag
- 4.5 $
Results
- Cubic yards
- 1.48
- 2 cu ft bags
- 20
- Bagged cost
- $90.00
- Bed area
- 160 sq ft
How does the Mulch Calculator work?
Volume is bed area times depth. Three inches is a common depth that blocks weeds without smothering plants.
One cubic yard is 27 cubic feet, so a standard 2 cubic foot bag covers 13.5 yards per bag, rounded up to whole bags.
Frequently asked questions
How deep should mulch be?
Two to three inches is typical. Keep it a few inches away from tree trunks and stems.
How many bags are in a yard?
A cubic yard is 27 cubic feet, so it equals 13.5 bags of 2 cubic feet each.
Is bulk or bagged cheaper?
Bulk is usually cheaper for more than about 3 cubic yards. Bags suit small beds.
When should I replace mulch?
Top up 1 inch each spring or when it thins out. Replace it completely every few years as it decomposes.