Cedar Chips Calculator: How Much Do I Need?
Multiply your area (length x width) by your desired depth, divide by 12 to get cubic feet, then divide by your bag’s cubic-foot size — a standard 2 cu ft bag covers about 12 sq ft at 2 in deep or 8 sq ft at 3 in deep.
Quick Answer
Multiply your area (length x width) by your desired depth, divide by 12 to get cubic feet, then divide by your bag’s cubic-foot size — a standard 2 cu ft bag covers about 12 sq ft at 2 in deep or 8 sq ft at 3 in deep.
Cedar Chips Calculator: How Much Do I Need?
Enter your values below for an instant result, then see the formula, worked example, and common mistakes.
Enter your area and depth, then click calculate.
How to Use This Calculator
Measure the length and width in feet of the garden bed, play area, or path you’re covering with cedar chips.
Use 1-2 in for refreshing an existing bed, 2-3 in for a typical new garden bed, and 3-4 in for weed suppression, moisture retention, or playground safety surfacing.
Most bagged cedar mulch and cedar chips come in 2 cubic foot bags, though 1.5 and 3 cu ft bags also exist — check the bag label.
The calculator converts your area and depth into cubic feet, then divides by your bag size and rounds up, since bags are sold as whole units.
Formula
Cubic feet needed = Length (ft) x Width (ft) x Depth (in) / 12.
Cubic yards = Cubic feet / 27. Bags needed = Cubic feet / bag size (cu ft), rounded up.
Reference Table: Coverage per 2 Cu Ft Bag by Depth
| Depth | Coverage per 2 cu ft bag | Typical use |
|---|---|---|
| 1 in | 24 sq ft | Light refresh over existing mulch |
| 2 in | 12 sq ft | Refreshing beds, vegetable gardens |
| 3 in | 8 sq ft | New garden beds, weed suppression |
| 4 in | 6 sq ft | Play areas, tree rings, erosion control |
Common Mistakes to Avoid
- Guessing depth instead of measuring — a 1-inch difference in depth changes the cubic footage needed by 33-50% on the same area.
- Not rounding up to full bags — calculating 9.3 bags means you need to buy 10, since retailers do not sell partial bags.
- Confusing cubic feet with cubic yards when ordering bulk cedar chips from a landscaping supplier — bulk material is usually sold and delivered by the cubic yard, not cubic foot.
- Applying cedar chips too deep (over 4 in) around tree trunks or plant stems, which can trap moisture against bark and promote rot.
When the Estimate May Be Wrong
This calculator assumes a flat, rectangular area with uniform depth. For irregular beds, break the space into rectangles and add the areas together, or use an average width. Sloped areas, raised borders, or beds with heavy existing mulch will need adjusted quantities — add roughly 10% extra for uneven ground or settling.
FAQs
How many bags of cedar chips do I need per square foot?
At a common 3 in depth, one 2 cu ft bag covers about 8 sq ft. Divide your total square footage by 8 to estimate bags needed at that depth.
How deep should cedar mulch be?
2-3 in is standard for garden beds; use 3-4 in for weed suppression or play area cushioning, and avoid piling mulch directly against tree trunks or plant stems.
Is cedar chips sold by the bag or by the yard cheaper?
Bagged cedar chips are convenient for small areas, but bulk cedar mulch by the cubic yard is usually significantly cheaper per cubic foot for large areas (typically anything over 1-2 cubic yards, or about 15-20 standard bags).
Do cedar chips repel insects?
Cedar contains natural oils (thujone and cedrol) that can help deter some insects like moths and certain garden pests, though the effect fades as the chips age and weather.
Sources and Methodology
Coverage figures are based on standard 2 cubic foot bagged mulch/cedar chip conversions used across major mulch calculators and landscaping suppliers (24 sq ft at 1 in, 12 sq ft at 2 in, 8 sq ft at 3 in, 6 sq ft at 4 in per 2 cu ft bag), and the standard construction conversion of 27 cubic feet per cubic yard.
