Range Calculator

Compute the range (max − min) of a list of numbers.

Inputs

Result

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How to use this calculator

  • Enter your numbers.
  • Read the range, min, and max.

About this calculator

The range is the simplest measure of data spread — the difference between the largest and smallest values. It's easy to compute but extremely sensitive to outliers, so most statistics work uses standard deviation or interquartile range instead. Range is most useful as a quick sanity check of data extent.

Frequently asked

Why is range a poor measure of spread?+
Because it depends only on the two extreme values. A single outlier completely changes the range. Standard deviation and IQR are more robust.
Can range be zero?+
Yes — when every value in the list is identical.
Is range the same as IQR?+
No. IQR is the middle 50% spread (Q3 − Q1) and is robust to outliers. Range is the full spread, outliers and all.
How does range relate to standard deviation?+
For roughly normal data, range ≈ 4-6 standard deviations (rule of thumb). The standard-deviation calculator gives the more useful number.
Why include range in basic stats?+
Quickly tells you the order-of-magnitude of variability. Useful as a first look before computing more sophisticated measures.

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