Know exactly how much mulch you need.
Instant cubic yards and bag counts for your garden beds. Built for homeowners, not contractors.
Estimates only. Actual mulch volume varies with settling, bed shape, and existing coverage. Always verify quantities before purchasing.
Mulch reference: coverage tables, mulch types, weights, bed templates
The calculator above estimates cubic yards and bag counts for rectangular garden beds. The reference below covers everything around the order: the full coverage grid at every common depth, conversions between bag sizes and bulk yards, properties of the eight mulch types you'll see at any supply yard, weight and hauling capacity, ready-to-copy bed templates, and seasonal timing by climate zone.
Mulch coverage grid
Square feet covered per unit of mulch at each common application depth. Use this when you know what you're buying and want to back-solve for area, or when you're estimating multiple beds without re-entering each one.
| Depth | 1 cu yd | 2 cu ft bag | 3 cu ft bag | 1.5 cu ft bag |
|---|---|---|---|---|
| 1 in | 324 sq ft | 24 sq ft | 36 sq ft | 18 sq ft |
| 1.5 in | 216 sq ft | 16 sq ft | 24 sq ft | 12 sq ft |
| 2 in | 162 sq ft | 12 sq ft | 18 sq ft | 9 sq ft |
| 2.5 in | 130 sq ft | 9.6 sq ft | 14.4 sq ft | 7.2 sq ft |
| 3 in | 108 sq ft | 8 sq ft | 12 sq ft | 6 sq ft |
| 3.5 in | 93 sq ft | 6.9 sq ft | 10.3 sq ft | 5.1 sq ft |
| 4 in | 81 sq ft | 6 sq ft | 9 sq ft | 4.5 sq ft |
| 5 in | 65 sq ft | 4.8 sq ft | 7.2 sq ft | 3.6 sq ft |
| 6 in | 54 sq ft | 4 sq ft | 6 sq ft | 3 sq ft |
The pattern: coverage halves when depth doubles. At 3 in, one cubic yard covers a 12 ft by 9 ft bed. At 6 in, the same yard only covers half that.
Bag and bulk size conversion
| Quantity in | Equivalent in | Notes |
|---|---|---|
| 1 cubic yard | 27 cubic feet | The universal conversion |
| 1 cubic yard | 13.5 bags of 2 cu ft | Most common bag size in the US |
| 1 cubic yard | 9 bags of 3 cu ft | Standard bulk-equivalent bag |
| 1 cubic yard | 18 bags of 1.5 cu ft | Smaller premium-product bag |
| 1 cubic yard | 27 bags of 1 cu ft | Decorative stone and rubber size |
| 1 cubic yard | 764.6 liters | Metric conversion if a spec sheet uses it |
| 1 cubic foot | 7.48 gallons | Useful for soil amendments mixed in |
| 1 cubic foot | 28.3 liters | Metric bag sizes from European brands |
| 1 scoop (yard supplier) | ~0.5 cubic yard | Front-end-loader scoop, varies by yard |
A pickup truck bed (6.5 ft by 4.5 ft) holds about 2 cubic yards level with the rails. A short-bed truck holds about 1.5. Most yards refuse to load above the rails for liability reasons.
Mulch type reference
Color, longevity, decomposition rate, and pH effect for the eight most common mulches at residential supply yards. Prices reflect 2025 averages in US metros; expect 20% to 40% regional variation.
| Mulch type | Color | Longevity | Decomp rate | pH effect | Typical cost / yd | Best for |
|---|---|---|---|---|---|---|
| Hardwood bark (shredded) | Dark brown, fades grey | 1 year | Fast | Slightly acidic | $30 to $55 | General beds, foundation plantings |
| Cedar (chipped) | Reddish brown, fades silver | 2 to 3 years | Slow | Neutral | $40 to $70 | Beds near house, pest-prone areas |
| Pine bark nuggets | Reddish brown | 2 years | Slow | Acidic | $35 to $60 | Acid-loving plants (azaleas, blueberries) |
| Pine straw | Rust to brown | 1 year | Medium | Acidic | $25 to $45 | Sloped beds, southeastern US gardens |
| Cypress | Tan to silver | 3 to 4 years | Very slow | Neutral | $45 to $75 | Hot-climate beds, drainage zones |
| Dyed mulch (black, red, brown) | As dyed | 1 year color, decomp varies | Fast | Varies | $30 to $50 | Visual contrast against light siding |
| Rubber (shredded) | As dyed | 10+ years | None | None | $250 to $350 | Playgrounds, paths (not vegetable beds) |
| Stone / gravel | Grey, tan, white | Indefinite | None | Neutral to alkaline | $60 to $200 | Xeriscape, drainage, paths |
Dyed mulches use vegetable dye, iron oxide, or carbon black; all three are landscape-safe but the cheapest brands fade visibly by August. Rubber leaches zinc into soil over years and is restricted near edible crops in several states. Stone and gravel hold heat near foundations, which raises soil temperature 5 to 10 degrees in summer.
Weight and hauling reference
Useful when borrowing a truck, sizing a wheelbarrow workflow, or asking whether the supplier's delivery vehicle can reach the side yard.
| Mulch volume | Hardwood (dry) | Hardwood (rain-soaked) | Stone | Rubber |
|---|---|---|---|---|
| 1 cu ft | ~30 lb | ~37 lb | ~95 lb | ~33 lb |
| 1 cu yd | ~810 lb | ~1,000 lb | ~2,565 lb | ~890 lb |
| 2 cu ft bag | ~60 lb | ~75 lb | ~190 lb | ~66 lb |
| 3 cu ft bag | ~90 lb | ~112 lb | n/a | ~99 lb |
| 1/2 pickup load (1 yd) | ~810 lb | ~1,000 lb | ~2,565 lb | ~890 lb |
| Full pickup load (2 yd) | ~1,620 lb | ~2,000 lb | ~5,130 lb | ~1,780 lb |
A standard contractor wheelbarrow holds 6 cubic feet, which is ~180 lb of dry hardwood and ~225 lb wet. A garden wheelbarrow at 3 cubic feet halves that. Plan ~10 minutes per round trip for a 100-ft driveway-to-bed distance once you account for loading, walking, and dumping.
Common landscape bed templates
Ready-to-order quantities for the five most common residential bed shapes. All assume 3 in depth and a 10% overage. If the depth target changes, scale linearly: 2 in is two-thirds the volume, 4 in is one-third more.
| Bed type | Dimensions | Area | Yards (3 in + 10%) | 2 cu ft bags | 3 cu ft bags |
|---|---|---|---|---|---|
| Tree ring (single mature tree) | 4 ft diameter | 12.6 sq ft | 0.13 | 2 | 2 |
| Tree ring (large oak) | 8 ft diameter | 50 sq ft | 0.51 | 7 | 5 |
| Mailbox island | 4 ft by 4 ft | 16 sq ft | 0.16 | 3 | 2 |
| Foundation bed (narrow) | 2 ft by 30 ft | 60 sq ft | 0.61 | 9 | 6 |
| Foundation bed (full house front) | 4 ft by 50 ft | 200 sq ft | 2.04 | 28 | 19 |
| Side yard strip | 3 ft by 40 ft | 120 sq ft | 1.22 | 17 | 11 |
| Island bed (kidney) | 8 ft by 12 ft | 76 sq ft | 0.77 | 11 | 7 |
| Vegetable garden border | 2 ft by 20 ft (×4 sides) | 160 sq ft | 1.63 | 22 | 15 |
| Backyard shade bed | 10 ft by 15 ft | 150 sq ft | 1.53 | 21 | 14 |
| Whole-property refresh (typical 1/4 acre) | ~600 sq ft total beds | 600 sq ft | 6.11 | 83 | 56 |
Round bag counts up. Suppliers round bulk yards to the nearest quarter or half.
Application timing by climate zone
The right time to mulch is when soil temperature stabilizes above 50 degrees in spring or before the first hard freeze in fall. Specific windows by USDA hardiness zone:
| USDA zone | Spring application | Fall application | Notes |
|---|---|---|---|
| Zone 3 (northern Maine, ND) | Late May to early June | Late September | Avoid mulching frozen ground |
| Zone 4 (upper Midwest, mountain) | Mid May | Early October | Refresh thinly; deep mulch prevents winter snowmelt absorption |
| Zone 5 (Great Lakes, NE) | Early to mid May | Mid October | The two heaviest demand weeks of the year |
| Zone 6 (mid-Atlantic, OH valley) | Mid April to early May | Late October to mid November | Most flexible timing |
| Zone 7 (DC, Carolinas inland) | Early April | November | Extended fall window |
| Zone 8 (deep south, PNW) | Late March | Late November | Mulch supports overwintering |
| Zone 9 (FL, gulf coast, CA central valley) | February to March | December | Mulch for moisture retention more than insulation |
| Zone 10 (south FL, southern CA) | Year-round, peak January to March | n/a | Decomposition runs fast; refresh every 8 months |
Spring weekend traffic at supply yards peaks the second weekend after the last frost date in each zone. Order mid-week or schedule delivery a week ahead.
Unit conversions and formulas
Core conversions for back-of-envelope checks:
Cubic yards needed = (length_ft × width_ft × depth_in / 12) / 27 Cubic yards needed = sq_ft × depth_in / 324 2 cu ft bags needed = cubic_yards × 13.5 3 cu ft bags needed = cubic_yards × 9 Cubic yards with 10% overage = base_yards × 1.10
Worked example for a 12 ft by 20 ft bed at 3 in depth with overage:
Area = 12 × 20 = 240 sq ft Base volume = 240 × 3 / 324 = 2.22 cubic yards With 10% overage = 2.22 × 1.10 = 2.44 cubic yards 2 cu ft bag equivalent = 2.44 × 13.5 = 33 bags (round up) 3 cu ft bag equivalent = 2.44 × 9 = 22 bags (round up)
Inverse formula, when you know how many bags you can fit in the car and want to know how much area that covers at 3 in:
Coverage_sqft = bags × bag_size_cuft × 4 (e.g., 10 bags of 2 cu ft = 80 sq ft at 3 in)
Related concepts
- Soil pH testing
- A $10 soil test kit from any garden center confirms whether your beds are acidic enough for pine or cedar mulch to be net-neutral. Below 6.0, switch to hardwood.
- Landscape fabric
- Sometimes recommended under stone or rubber mulch; not recommended under organic mulches because it blocks the decomposition path back into soil.
- Edging depth
- Steel or stone edging set 3 in below grade keeps mulch in beds; shallower edging lets the first heavy rain spill mulch onto the lawn.
- Compost vs mulch
- Compost is mixed into soil for nutrients; mulch sits on top for weather protection. The two are not interchangeable, though aged hardwood mulch eventually becomes compost in place.
- Bagged soil amendments
- Peat moss, pine fines, and leaf mold are sometimes sold alongside mulch and look similar in the bag. Check the label; soil amendments compact and smother roots if used as a surface mulch.