Feet inch calculator app: precise statistical analysis

This feet inch calculator app helps researchers, students, and professionals handle measurement data in feet and inches. It computes descriptive statistics, confidence intervals, and shows a clear graph — all with accuracy and international standards in mind.

📐 Input your measurements

Enter each measurement on a new line using the format 5'11" (feet and inches). You can also include decimals like 6'2.5". The calculator will parse and convert everything to inches for statistical analysis.

Understanding each input factor

  • Sample data — your measurements in feet/inches format. Each line represents one observation.
  • Confidence level — the probability that the calculated interval contains the true population mean. Higher levels give wider intervals.
  • Model year — a free label to identify different data collection periods (e.g., 2024, 2025).
Table 1: Current input summary
ParameterValue / description
Sample size (n)—
Confidence level95%
Model year2024

📊 Statistical results

Based on your data, the following statistics are computed using t‑distribution (for accurate confidence intervals). All length values are shown in feet‑inches and decimal inches.

Mean— (ft-in)
— inches
Std deviation— inches
Confidence interval— (ft-in)
— inches
Margin of error— inches
Table 2: Detailed output measures
MeasureFeet / inchesDecimal inches
Sample mean——
Standard deviation (sample)——
Lower bound (CI)——
Upper bound (CI)——
Margin of error——

▲ Dot plot: each blue dot is a measurement (jittered vertically). Red line = mean, dashed orange = confidence limits.

📌 Interpreting your confidence interval

Table 3: Confidence interval meaning
If your confidence level is …Interpretation
90%We expect that 90% of such intervals would contain the true population mean.
95% (most common)With 95% confidence, the true mean height (in inches) lies between the lower and upper bounds.
99%There is a 99% chance that the interval captures the true mean; interval is wider.

Always consider sample size and real‑world context. The t‑interval used here is robust for small samples and meets academic standards.

❓ Frequently asked questions

How do I enter feet and inches?
Use the standard format: 5'11" (feet symbol ‘ and inches symbol “). You can also add spaces: 5' 11". Decimals are allowed: 5'10.5". One measurement per line.
What confidence level should I pick?
Common choices are 90%, 95%, or 99%. 95% is the standard in many research fields. It means that if you repeated the sampling many times, 95% of the intervals would contain the true population mean.
What is the model year used for?
The model year is a custom field you can use to tag your data (e.g., 2024, 2025). It does not affect calculations but helps you keep track of different data sets.
Does the calculator use t‑scores or z‑scores?
It uses the t‑distribution (via jStat) for accurate confidence intervals, following international statistical standards. This is appropriate for small sample sizes and real‑world research.

Use the Stone Calculator (Square Feet) to estimate stone coverage, or browse the full Feet & Inches Measurement Calculator category for all related measurement tools.

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