Cubic Yards Calculator
Multiply length x width x depth (all converted to feet) to get cubic feet, then divide by 27 to convert to cubic yards — the standard unit for ordering bulk materials like soil, mulch, gravel, and concrete.
Quick Answer
Multiply length x width x depth (all converted to feet) to get cubic feet, then divide by 27 to convert to cubic yards — the standard unit for ordering bulk materials like soil, mulch, gravel, and concrete.
Cubic Yards Calculator
Enter your area dimensions and depth below for an instant estimate, then see the formula, worked example, and common mistakes.
Enter your values and click calculate.
How to Use This Calculator
For irregular areas, break the space into rectangular sections and sum the areas.
Bulk material depth (like 2-4 inches of mulch or 6 inches of gravel base) is easiest to measure in inches — the calculator converts it to feet automatically.
10% extra is standard supplier guidance for settling, spillage, and uneven grading.
Many bulk suppliers deliver in half-yard or full-yard increments, so round your order up accordingly.
Formula
Cubic yards = (Length(ft) x Width(ft) x Depth(ft)) / 27, where Depth(ft) = Depth(in) / 12.
Reference Table: Common Depth Conversions
| Depth (inches) | Depth (feet) |
|---|---|
| 2 in | 0.0556 ft |
| 4 in | 0.333 ft |
| 6 in | 0.5 ft |
| 12 in | 1.0 ft |
Common Mistakes to Avoid
- Forgetting to convert depth from inches to feet before multiplying — this is the single most common error in cubic-yard estimates.
- Ordering the exact calculated volume with no waste buffer — suppliers typically recommend 10% extra for settling, spillage, and uneven grading.
- Assuming suppliers deliver in any fractional cubic yard — many bulk material suppliers sell in half-yard or full-yard increments, so round up accordingly.
- Using cubic feet and cubic yards interchangeably when comparing supplier quotes — always confirm which unit a price is quoted in.
When the Estimate May Be Wrong
This is a straightforward geometric conversion, so the formula itself is always correct — error comes from inaccurate area/depth measurements, uneven or sloped ground (which changes effective depth across the area), or compaction after material settles. For large or irregularly shaped areas, break the space into smaller rectangular sections and sum their individual cubic-yard totals for a more accurate estimate.
FAQs
How many cubic feet are in a cubic yard?
There are exactly 27 cubic feet in 1 cubic yard (3 ft x 3 ft x 3 ft = 27 cubic feet).
How do I calculate cubic yards for soil, mulch, or gravel?
Multiply length x width x depth (all in feet) to get cubic feet, then divide by 27 to get cubic yards.
Why is depth usually entered in inches but the formula needs feet?
Bulk material depth (like 2-4 inches of mulch or 6 inches of gravel base) is easiest to measure and think about in inches, so the calculator converts it to feet automatically before computing volume.
Should I round up my cubic yard order?
Yes — most suppliers deliver in half-yard or full-yard increments and recommend a 10% buffer for settling and spillage, so rounding up avoids running short mid-project.
Sources and Methodology
The cubic-yard conversion (27 cubic feet = 1 cubic yard) is an exact geometric relationship (3 ft x 3 ft x 3 ft), and the 10% waste-buffer convention reflects standard bulk-material supplier guidance for soil, mulch, gravel, and concrete ordering as of 2026.
