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Quartile Calculator
Find the first, second and third quartiles, the interquartile range and the five number summary of a data set.
Quartiles of your data set
Q1 (25th percentile): —
Q2 (median): —
Q3 (75th percentile): —
Interquartile range: —
Minimum: — · Maximum: — · Count:
—
How to use the Quartile Calculator
- Paste or type your data set into the box, separated by commas or spaces.
- Check the quartiles and the interquartile range as they update while you type.
- Read the five number summary in the result panel.
Features
- First, second and third quartiles
- Interquartile range and five number summary
- Accepts commas, spaces, tabs and new lines
- Updates live as you type
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Frequently Asked Questions
Common questions about the free online quartile calculator.
Paste your data set and the tool reports the first, second and third quartiles plus the
interquartile range.
They split sorted data into four equal parts: Q1 is the 25th percentile, Q2 the median and Q3
the 75th percentile.
It is the difference between the third and first quartiles, and it measures the spread of the
middle half of the data.
It is the minimum, first quartile, median, third quartile and maximum of a data set.
It uses linear interpolation between the two nearest data points, matching the usual
spreadsheet percentile function.
The tool gives 2.75, 4.5 and 6.25, with an interquartile range of 3.5.
Values below Q1 minus 1.5 times the IQR or above Q3 plus 1.5 times the IQR are often treated
as outliers.
Yes. When the split falls between two values the tool interpolates, so fractional results are
normal.
No. The whole calculation happens in your browser and your numbers never leave your device.
Yes. It is completely free and unlimited, with no account, no sign-up and no usage caps.
Last updated: October 10, 2026