Mulch Calculator in Yards
Enter your bed dimensions to get cubic yards, bag count, weight, and coverage in seconds. Works for rectangular, circular, and triangular beds.
Yards of Mulch Calculator
Mulch Calculator in Yards
Enter length, width, and depth - get cubic yards instantly
USDA standard depth: 3 inches for garden beds, 4 inches for tree rings, 9-12 inches for playgrounds (ASTM F1292)
Formula - Length x Width x Depth / 27
One cubic yard equals 27 cubic feet. The yards of mulch formula divides your bed volume in cubic feet by 27 to convert it to cubic yards.
How to Calculate Yards of Mulch - Step by Step
A 10 ft x 20 ft garden bed has 200 square feet of area.
Standard depth is 3 inches for most landscape beds. The National Gardening Association recommends 3-4 inches for organic mulch.
200 sq ft x 3 in / 324 = 1.85 cubic yards. Or: 200 x (3/12) / 27 = 1.85 yd³.
1.85 x 1.10 = 2.04 cubic yards. The International Society of Arboriculture recommends the 10% settling buffer for all mulch projects.
| Bed Shape | Area Formula | Cubic Yards Formula |
|---|---|---|
| Rectangle / Square | Length x Width | L x W x D / 324 |
| Circle | 3.14 x Radius x Radius | 3.14 x r2 x D / 324 |
| Triangle | 0.5 x Base x Height | 0.5 x B x H x D / 324 |
| Ring (Tree Ring) | 3.14 x (R2 - r2) | 3.14 x (R2 - r2) x D / 324 |
| Trapezoid | ((a + b) / 2) x Height | ((a+b) / 2) x H x D / 324 |
D = depth in inches. Divide by 324 (= 12 x 27) converts inches and cubic feet to cubic yards in one step.
How Many Yards Do I Need by Bed Size
Use these reference tables to find the cubic yards for the four most common bed sizes. All values include no waste factor - add 10% to the result before ordering.
100 Square Foot Bed - Yards Needed
| Depth | Cubic Yards | Cubic Feet | 2 cu ft Bags | 3 cu ft Bags |
|---|---|---|---|---|
| 1 inch | 0.31 yd³ | 8.3 ft³ | 5 bags | 3 bags |
| 2 inches | 0.62 yd³ | 16.7 ft³ | 9 bags | 6 bags |
| 3 inches (standard) | 0.93 yd³ | 25 ft³ | 13 bags | 9 bags |
| 4 inches | 1.23 yd³ | 33.3 ft³ | 17 bags | 12 bags |
200 Square Foot Bed - Yards Needed
| Depth | Cubic Yards | Cubic Feet | 2 cu ft Bags | 3 cu ft Bags |
|---|---|---|---|---|
| 1 inch | 0.62 yd³ | 16.7 ft³ | 9 bags | 6 bags |
| 2 inches | 1.23 yd³ | 33.3 ft³ | 17 bags | 12 bags |
| 3 inches (standard) | 1.85 yd³ | 50 ft³ | 25 bags | 17 bags |
| 4 inches | 2.47 yd³ | 66.7 ft³ | 34 bags | 23 bags |
500 Square Foot Bed - Yards Needed
| Depth | Cubic Yards | Cubic Feet | 2 cu ft Bags | 3 cu ft Bags |
|---|---|---|---|---|
| 1 inch | 1.54 yd³ | 41.7 ft³ | 21 bags | 14 bags |
| 2 inches | 3.09 yd³ | 83.3 ft³ | 42 bags | 28 bags |
| 3 inches (standard) | 4.63 yd³ | 125 ft³ | 63 bags | 42 bags |
| 4 inches | 6.17 yd³ | 166.7 ft³ | 84 bags | 56 bags |
1,000 Square Foot Bed - Yards Needed
| Depth | Cubic Yards | Cubic Feet | 2 cu ft Bags | 3 cu ft Bags |
|---|---|---|---|---|
| 1 inch | 3.09 yd³ | 83.3 ft³ | 42 bags | 28 bags |
| 2 inches | 6.17 yd³ | 166.7 ft³ | 84 bags | 56 bags |
| 3 inches (standard) | 9.26 yd³ | 250 ft³ | 126 bags | 84 bags |
| 4 inches | 12.35 yd³ | 333 ft³ | 167 bags | 112 bags |
Bag counts rounded up. Add 10% to cubic yard values before ordering bulk mulch. A standard dump truck delivers 7-10 cubic yards per load.
Yard-to-Bag Equivalents
One cubic yard equals 27 cubic feet. The Mulch and Soil Council (MSC) sets the standard bag labeling - 2 cubic foot bags are the most common retail size across major home-improvement retailers.
| Cubic Yards | Cubic Feet | 1.5 cu ft Bags | 2 cu ft Bags | 3 cu ft Bags | Est. Weight (bark) |
|---|---|---|---|---|---|
| 0.5 yd³ | 13.5 ft³ | 9 bags | 7 bags | 5 bags | 200-300 lbs |
| 1 yd³ | 27 ft³ | 18 bags | 14 bags | 9 bags | 400-600 lbs |
| 1.5 yd³ | 40.5 ft³ | 27 bags | 21 bags | 14 bags | 600-900 lbs |
| 2 yd³ | 54 ft³ | 36 bags | 27 bags | 18 bags | 800-1,200 lbs |
| 3 yd³ | 81 ft³ | 54 bags | 41 bags | 27 bags | 1,200-1,800 lbs |
| 5 yd³ | 135 ft³ | 90 bags | 68 bags | 45 bags | 2,000-3,000 lbs |
| 7 yd³ | 189 ft³ | 126 bags | 95 bags | 63 bags | 2,800-4,200 lbs |
| 10 yd³ | 270 ft³ | 180 bags | 135 bags | 90 bags | 4,000-6,000 lbs |
Bag counts rounded up. Weight based on bark/hardwood mulch at 400-600 lbs per cubic yard. Use the Bags to Yards Converter for reverse calculations.
Yard Coverage at 2in / 3in / 4in
Coverage = 324 / Depth (inches). One cubic yard covers 324 square feet at 1 inch deep. The National Association of Landscape Professionals recommends 3 inches as the standard depth for residential beds.
| Cubic Yards | Coverage at 1" | Coverage at 2" | Coverage at 3" | Coverage at 4" |
|---|---|---|---|---|
| 0.5 yd³ | 162 sq ft | 81 sq ft | 54 sq ft | 40 sq ft |
| 1 yd³ | 324 sq ft | 162 sq ft | 108 sq ft | 81 sq ft |
| 1.5 yd³ | 486 sq ft | 243 sq ft | 162 sq ft | 121 sq ft |
| 2 yd³ | 648 sq ft | 324 sq ft | 216 sq ft | 162 sq ft |
| 3 yd³ | 972 sq ft | 486 sq ft | 324 sq ft | 243 sq ft |
| 5 yd³ | 1620 sq ft | 810 sq ft | 540 sq ft | 405 sq ft |
| 7 yd³ | 2268 sq ft | 1134 sq ft | 756 sq ft | 567 sq ft |
| 10 yd³ | 3240 sq ft | 1620 sq ft | 1080 sq ft | 810 sq ft |
Recommended Depth by Application
FAQ
Cubic yards needed = Length (ft) x Width (ft) x Depth (in) / 324. A 10 x 20 ft bed at 3 inches deep needs 10 x 20 x 3 / 324 = 1.85 cubic yards. Add 10% for settling and waste - order 2.04 cubic yards. Use the calculator above for instant results.
Measure your bed in feet. Multiply length x width to get square footage. Multiply square footage by depth in inches, then divide by 324. The number 324 equals 12 x 27 - it converts depth from inches and volume from cubic feet to cubic yards in one step. Round up to the nearest 0.5 yard when ordering bulk.
One cubic yard of mulch covers 324 sq ft at 1 inch deep, 162 sq ft at 2 inches, 108 sq ft at 3 inches, and 81 sq ft at 4 inches. Depth is the biggest variable - doubling the depth halves the coverage area.
One cubic yard equals 13.5 bags of 2 cu ft mulch. Always round up and buy 14 bags per cubic yard. One yard also equals 18 bags of 1.5 cu ft mulch or 9 bags of 3 cu ft mulch. The Bags to Yards Converter handles this in both directions.
Bark and shredded hardwood mulch weighs 400-600 lbs per cubic yard when dry. Rubber mulch weighs 800-1,200 lbs per cubic yard. Rock and pea gravel weighs 2,400-3,000 lbs per cubic yard. A standard pickup truck carries 1-2 cubic yards of bark mulch - never exceed the truck payload rating.
Yes. A mulch calculator in yards and a cubic yards mulch calculator use the same formula: L x W x D / 324. The output is cubic yards in both cases. The Cubic Yards Calculator on this site adds support for circular, triangular, and irregular bed shapes beyond the standard rectangle.
A standard single-axle dump truck carries 7-10 cubic yards of mulch per load. A tandem-axle truck carries 12-14 cubic yards. Local landscape suppliers charge a delivery fee of $40-$80 per load on top of the material cost. Bulk delivery is cost-effective for projects over 3 cubic yards.
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