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First Quartile Calculator — result sheet
Calculate the 25th percentile from a finite numeric list using linear interpolation on sorted positions.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Q1 is the value at the linear position 0.25×(n−1) in the sorted list.
The sorted position and interpolated first quartile are returned so the chosen percentile convention is visible.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Data values — Enter 2 to 500 finite numbers separated by commas or spaces.
Worked example
| Input | Value |
|---|---|
| Data values | 2, 4, 5, 7, 9, 12, 15 |
Q1 =4.5.
Assumptions and limits
- The input contains 2 to 500 finite numeric values separated by commas or whitespace.
- The linear zero-based percentile convention is used.
- Weights, missing values, outlier treatment, and alternate quartile conventions are not modeled.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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