Sod calculator square feet
Get accurate sod quantities using real-world sample measurements and confidence intervals. Designed for professionals and DIYers — just enter your data below.
📐 1. Enter your sample data & parameters
Provide measurements from different parts of your lawn. The more samples you add, the tighter the confidence interval. All fields are required.
- Total sections (N): How many individual plots / sections make up the whole lawn? (e.g., 20 if you divide lawn into 20 squares)
- Sample data: Actual measured areas (in sq ft) from some of those sections. Use commas.
- Confidence level: Typical values: 90%, 95%, 99%. Higher = wider interval.
- Model year: For your record (2024,2025…). Doesn’t affect math.
📊 2. Statistical results & graphs
Below you’ll find the detailed statistics from your samples, a visual distribution, and the final estimated sod square footage with confidence intervals.
Bar chart: each sample area (sq ft). Dashed line = sample mean.
📋 Input summary
| Total sections (N) | – |
|---|---|
| Sample size (n) | – |
| Confidence level | – |
| Model year | – |
📋 Sample data listing
📊 Descriptive statistics (from samples)
| Mean (average) area per section | – |
|---|---|
| Standard deviation (sample) | – |
| Standard error (SE) | – |
| Degrees of freedom (df) | – |
🎯 Confidence interval & total sod area
| Critical t-value | – |
|---|---|
| Margin of error (per section) | – |
| CI for mean section area | – |
| Estimated total sod area | – |
| CI for total area (lower – upper) | – |
🔍 Interpretation of results
| Confidence level | – |
|---|---|
| We are [conf]% confident that the true average section area lies between | – |
| Total sod required (point estimate) | – |
| Plausible range for total sod (with [conf]% confidence) | – |
| Practical advice | If you order this amount, you cover the whole lawn with the chosen confidence. |
✅ How to use these estimates in real life
The calculator follows international statistical standards (t-distribution, SRS). It works for any shape of lawn — just break it into sections (grids) and measure a random few.
- Point estimate: total area = average sample × N. Good starting point.
- Confidence interval: gives a safety margin. For critical projects, use the upper bound to avoid shortage.
- Model year: handy to compare quotes from different years.
💡 Pro tip: more samples → narrower interval → less waste or risk.
Use the Siding Square Foot Calculator to find the square footage you need, or explore the full Feet & Inches Measurement Calculator category for more measurement tools.