Quartiles
Find the lower quartile, median and upper quartile by linear interpolation.
Your numbers
Lower quartile Q1
Quartile conventions differ between software. This tool uses type-7 linear interpolation.
Scenario comparison
Up to three snapshots in this tab. Loading one replaces the current inputs.
Formula
Sorted position h=(n−1)p, with linear interpolation (type 7).
Find the lower quartile, median and upper quartile by linear interpolation.
Worked example
- Observations
- 1, 2, 3, 4, 5, 6, 7, 8, 9
- Lower quartile Q1
- 3
- Median Q2
- 5
- Upper quartile Q3
- 7
Scope and limitations
Quartile conventions differ between software. This tool uses type-7 linear interpolation.
Inputs are checked for missing values and allowed ranges. A result outside the finite numeric range is not displayed. Rounding affects display, while the calculation uses the model’s numeric precision.
Check your units and assumptions before relying on a result. Changing a label does not convert a currency or physical unit.
Formula version: dc114441f262 · Example checked: