Cubic Feet to Yards Calculator
This tool combines precise unit conversion with statistical depth. Enter your sample measurements in cubic feet, choose a confidence level, and get the equivalent in cubic yards plus a reliable confidence interval. Perfect for research, engineering, or any project needing accuracy.
📐 Input your sample & parameters
Fill in the fields below. The calculator accepts multiple cubic feet values — use commas or spaces.
Enter numbers separated by commas. At least two required for stats.
Input fields explained
| Field | Description | Example |
|---|---|---|
| Sample data | Raw volume measurements in cubic feet (at least 2 numbers) | 10.2, 13.5, 11.8 |
| Confidence level | Statistical certainty for the interval (80%–99%) | 95% |
| Model year | Optional tag for project year or version | 2025 |
📊 Results & interpretation
Sample distribution & mean CI (in cubic feet)
Bars = individual sample values. Dashed line = mean. Shaded band = confidence interval for the mean (cubic feet).
| Metric | Value (cubic feet) | Value (cubic yards) |
|---|---|---|
| Sample mean | — | — |
| CI lower bound | — | — |
| CI upper bound | — | — |
| Sample size (n) | — | |
Understanding your results
| Term | Meaning |
|---|---|
| Mean (cubic yards) | Average of your samples converted to cubic yards (divide by 27). |
| Confidence interval (CI) | Range that likely contains the true population mean, based on your confidence level. |
| Margin of error | Half-width of the CI. Smaller with more data or lower confidence. |
Quick conversion reference
| Cubic feet | Cubic yards (approx) |
|---|---|
| 27 ft³ | 1 yd³ |
| 54 ft³ | 2 yd³ |
| 135 ft³ | 5 yd³ |
| 270 ft³ | 10 yd³ |
❓ Frequently asked questions
- How do I convert cubic feet to cubic yards? Divide by 27. Our calculator does it after statistical analysis.
- What does the confidence level mean here? It indicates the probability that the true average lies within the interval (e.g., 95% CI).
- Can I use this for construction or landscaping? Yes — ideal for concrete, soil, or gravel estimates with error margins.
- What if my sample data has only one number? You need at least two values. The calculator will show an error.
- Why do you ask for a model year? Only for your own record keeping; not used in math.
Use the Mulch Calculator (Square Feet) to estimate your mulch needs, or explore the full Feet & Inches Measurement Calculator category for more measurement tools.