Convert Linear Feet to Cubic Yards Calculator
Use this premium calculator to convert linear feet into cubic yards for mulch, gravel, concrete, topsoil, sand, compost, and other bulk materials. Enter the run length, the width of the area, and the planned depth. The tool instantly converts your measurements into cubic feet and cubic yards so you can estimate material orders with more confidence.
Material Volume Calculator
How to use a convert linear feet to cubic yards calculator
A convert linear feet to cubic yards calculator helps you estimate volume for long, narrow areas where a simple length measurement by itself is not enough. Contractors, landscapers, builders, and homeowners often measure a flower bed, trench, walkway border, drainage line, curb run, or retaining wall base in linear feet. However, suppliers usually sell loose material in cubic yards. The gap between those two units is exactly why this calculator matters.
Linear feet only describe one dimension: length. Cubic yards describe three-dimensional volume. To move from one to the other, you must also know the width and depth of the material area. Once those are known, the formula becomes straightforward:
Cubic yards = Length in feet × Width in feet × Depth in feet ÷ 27
The number 27 is important because 1 cubic yard equals 27 cubic feet. This is the universal conversion that turns jobsite dimensions into order quantities. For example, if you have a 100-foot planting bed, 3 feet wide, and 4 inches deep, the volume is 100 × 3 × 0.3333 = about 100 cubic feet. Dividing by 27 gives about 3.70 cubic yards before any waste factor is added.
Why linear feet alone is not enough
Many people search for a way to convert linear feet directly to cubic yards, but there is no single fixed conversion because the answer changes with width and depth. A 100-foot run at 2 feet wide and 2 inches deep is dramatically different from a 100-foot run at 4 feet wide and 6 inches deep. The same length can require a small decorative mulch order or a truckload of aggregate depending on the cross section.
This calculator solves that problem by asking for all the measurements required to estimate real volume. That is especially useful for:
- Mulch around landscape beds
- Topsoil spread along fencing or foundations
- Gravel in trenches, paths, and drive edges
- Sand under pavers
- Concrete footings or narrow formwork
- Compost in raised bed rows or garden strips
The exact math behind the calculator
Step 1: Start with linear feet
Enter the run length in feet. If your measurements come from a site plan, a tape measure, or a wheel, make sure they reflect the actual installed length rather than a rough estimate. Small errors can multiply when a project covers long distances.
Step 2: Convert width to feet
Width may be entered in inches, feet, or yards. If the width is in inches, divide by 12. If it is in yards, multiply by 3 to convert to feet. Standardizing everything to feet makes the volume formula consistent and accurate.
Step 3: Convert depth to feet
Depth is very often measured in inches for mulch, topsoil, gravel, and sand. A 2-inch, 3-inch, or 4-inch installation depth is common in landscaping. To convert inches to feet, divide by 12. A 4-inch layer becomes 0.3333 feet.
Step 4: Calculate cubic feet
Multiply length × width × depth to get cubic feet. This intermediate result is useful because many people understand small volume estimates more intuitively in cubic feet.
Step 5: Convert cubic feet to cubic yards
Divide cubic feet by 27. That final number is what most landscape suppliers, mulch dealers, soil yards, and aggregate companies use when pricing and delivering bulk material.
Step 6: Add a waste factor
Real-world conditions are rarely perfect. Material may compact, settle, spill, or vary in moisture content. Uneven grades and irregular edges also create extra demand. That is why many buyers add 5% to 15% to the calculated volume. This calculator includes a waste factor so your order reflects a more practical field estimate.
| Measurement fact | Exact value | Why it matters in this calculator |
|---|---|---|
| 1 foot | 12 inches | Used to convert width or depth entered in inches into feet. |
| 1 yard | 3 feet | Used to convert width or depth entered in yards into feet. |
| 1 cubic yard | 27 cubic feet | The key constant for converting project volume into supplier ordering units. |
| 4-inch layer | 0.3333 feet deep | A common mulch and top-dressing depth used in residential projects. |
Common project examples
Seeing the formula applied to real projects is often the fastest way to understand how linear feet translate into cubic yards.
Example 1: Mulch bed
Suppose you have a 150-foot mulch border around a building. The average width is 3 feet and the desired depth is 3 inches. Convert depth to feet: 3 inches ÷ 12 = 0.25 feet. Then multiply 150 × 3 × 0.25 = 112.5 cubic feet. Divide by 27 and you get 4.17 cubic yards. Adding 10% extra increases the order to about 4.58 cubic yards.
Example 2: Gravel trench
A trench runs 80 linear feet, is 18 inches wide, and needs 6 inches of gravel depth. Width in feet is 18 ÷ 12 = 1.5 feet. Depth in feet is 6 ÷ 12 = 0.5 feet. Volume is 80 × 1.5 × 0.5 = 60 cubic feet. Divide by 27 and the result is 2.22 cubic yards. With 10% extra, plan for about 2.44 cubic yards.
Example 3: Concrete footing
A footing is 60 feet long, 2 feet wide, and 10 inches deep. Depth becomes 10 ÷ 12 = 0.8333 feet. Multiply 60 × 2 × 0.8333 = about 100 cubic feet. Divide by 27 to reach about 3.70 cubic yards. Since concrete is usually ordered more precisely, many contractors still add a modest contingency based on site conditions and form accuracy.
| Project type | Dimensions | Base cubic yards | Cubic yards with 10% extra |
|---|---|---|---|
| Mulch border | 150 ft × 3 ft × 3 in | 4.17 yd³ | 4.58 yd³ |
| Gravel trench | 80 ft × 18 in × 6 in | 2.22 yd³ | 2.44 yd³ |
| Concrete footing | 60 ft × 2 ft × 10 in | 3.70 yd³ | 4.07 yd³ |
| Topsoil strip | 200 ft × 4 ft × 2 in | 4.94 yd³ | 5.43 yd³ |
When to round up your material order
Rounding strategy depends on the material and the supplier. Bulk mulch and compost are often forgiving, so many property owners round up to the nearest half-yard or full yard. Gravel and sand can also settle during transport and placement, so an extra cushion is usually practical. Concrete is different because over-ordering can be costly, but under-ordering can halt a pour. For concrete work, confirm dimensions carefully, account for form variation, and follow supplier guidance.
- Round up when the area has curves, tree rings, or irregular edges.
- Round up when the ground is uneven or compacted.
- Round up if the material will settle after placement.
- Use a tighter estimate when ordering premium or costly material.
Mistakes people make when converting linear feet to cubic yards
- Forgetting width entirely. Length alone cannot produce volume.
- Mixing units. A width in inches and a depth in feet must be standardized before multiplying.
- Ignoring compaction. Gravel, soil, and mulch can settle and compact after installation.
- Using nominal rather than actual dimensions. Measure the installed fill width and depth, not a rough target.
- Ordering exactly the calculator output. Practical field conditions usually justify a small waste factor.
Best practices for measuring the jobsite
If the width varies, divide the project into smaller sections and calculate each one separately. For example, a winding bed may have one section at 2 feet wide, another at 3.5 feet, and another at 5 feet. Separate estimates are usually more accurate than averaging everything loosely. The same principle applies to depth when there are grade changes or uneven subbase conditions.
For long projects, a measuring wheel can improve speed. For short or detailed sections, use a tape measure. If you are filling a trench, confirm whether width is measured at the top, middle, or bottom because side slopes can affect actual volume. For paver base or concrete, verify compacted depth requirements rather than loose spread depth.
Material-specific notes
Mulch
Mulch is often installed at 2 to 4 inches deep. Too shallow and weed suppression suffers. Too deep and plant roots may be stressed near trunks and stems. Because mulch fluffs differently depending on type and moisture, adding a moderate extra amount is common.
Topsoil and compost
These materials can settle after watering and grading. If you need a finished depth after settlement, account for some consolidation in your estimate. Fine-textured blends may compact more than coarse blends.
Gravel and sand
Aggregate projects should consider compaction and base preparation. The volume you spread loose may differ from the compacted finished depth. Check the intended specification before ordering.
Concrete
Concrete volume estimates should be based on form dimensions and reinforcement layout. Keep in mind that washout, pump priming, and unavoidable jobsite losses can affect final order quantities.
Authoritative measurement references
If you want additional background on unit conversion, materials, or project planning, review these trusted resources:
- National Institute of Standards and Technology (NIST) unit conversion guidance
- U.S. Environmental Protection Agency resources related to composting and organic materials
- University of Minnesota Extension guide to mulches and landscape materials
Frequently asked questions
Can I convert linear feet to cubic yards without width and depth?
No. Linear feet only measure length. To calculate cubic yards, you need width and depth as well.
What if my dimensions are in inches?
That is common. This calculator converts inches to feet automatically for width and depth inputs when you select the proper unit.
Why does the result include cubic feet too?
Cubic feet act as a helpful intermediate step and make it easier to sanity-check the math before converting to cubic yards.
Should I always add extra material?
In many landscaping and bulk delivery situations, yes. A 5% to 15% allowance is common, but your project type, budget, and tolerance for leftover material should drive the decision.
Bottom line
A convert linear feet to cubic yards calculator is one of the most practical estimating tools for landscaping and construction. The key insight is simple: linear feet become cubic yards only after width and depth are included. Once you convert all dimensions to feet, multiply them together, and divide by 27, you get the volume required in cubic yards. Add a reasonable waste factor, compare with supplier delivery increments, and you will place a smarter order with less guesswork.
Use the calculator above whenever you need to estimate volume for long, continuous areas. It is fast, accurate, and far more reliable than trying to guess from length alone.