🧱 Brick Calculator Square Feet
This calculator combines a classic brick estimate with statistical rigor. Enter your wall size, brick dimensions, and sample data to get a precise point estimate plus a confidence interval based on real-world variation. Perfect for professional masonry planning, academic exercises, or any project where accuracy matters.
📐 project inputs
📊 estimate & confidence interval
📈 visual range
🔍 interpreting your interval
- The point estimate is the expected number of bricks using average dimensions + waste.
- The confidence interval accounts for natural variation in brick length & height (based on your sample).
- If you measure more bricks (larger n), the interval becomes narrower — more precision.
- Waste percentage is applied to both the point and the range.
📋 reference tables
| parameter | value | unit |
|---|---|---|
| wall length | 10.0 | ft |
| wall height | 10.0 | ft |
| brick length | 7.5 | in |
| brick height | 3.5 | in |
| mortar | 0.5 | in |
| waste | 5.0 | % |
| sample size | 30 | – |
| SD length | 0.2 | in |
| SD height | 0.1 | in |
| confidence | 95 | % |
| output | value | interpretation |
|---|---|---|
| point estimate | — | expected bricks (with waste) |
| lower bound (CI) | — | conservative max bricks |
| upper bound (CI) | — | conservative min bricks |
| margin of error | — | ± around estimate |
| model year | common length (in) | common height (in) | notes |
|---|---|---|---|
| 2024 | 7.5 | 3.5 | standard modular |
| 2025 | 7.625 | 3.625 | slightly larger trend |
| 2026 | 7.5 | 3.5 | classic return |
| custom | use your own | input above | |
❓ frequently asked questions
You can use small values (like 0.1) to simulate minimal variation, or measure at least 10 bricks to get a realistic SD. The calculator still works if you set SD to 0 (then CI = point estimate).
This version uses feet for wall and inches for bricks. To use metric, convert: 1 m ≈ 3.281 ft, 1 cm ≈ 0.3937 in. Or simply enter feet/inches as decimals.
Because brick face area multiplies length & height, the brick count is inversely proportional to area. The CI around dimensions translates to a slightly asymmetric interval in brick count.
⚒️ professional brick estimator – all inputs considered
Use the Rock Calculator (Square Feet) to estimate material needs, or visit the Feet & Inches Measurement Calculator category to explore more length and area tools.