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Power BI · Microsoft AppSource

Error Bar

A dot-and-whisker chart for Power BI. Each point shows its value with a whisker for the uncertainty, give it bounds, or hand it raw rows and it computes the confidence interval itself.

Coming soonWatch tutorial
Preview of Error Bar

What it does.

A single number looks exact, but it rarely is. A mean, a forecast, a measured rate - each rest on a sample or an estimate, so the true value sits within a range. The Error Bar draws that range, so a reader sees not just the value but how far to trust it.

Every category shows a marker at its central value with a whisker running to an upper and a lower bound. A short whisker is a precise estimate; a long one is uncertain. When two intervals overlap, the difference between them may be noise; when they clear each other, it is more likely real.

The visual takes its bounds two ways. Supply your own Upper and Lower measures or hand it raw row-level values and it computes the interval itself - a 90, 95 or 99% confidence interval, standard error, standard deviation, interquartile range or percentile range, around a mean or median, with no DAX. It handles zero- and single-row cases and posts a short notice when the data shape blocks the chosen interval.

A reference line - at zero, the mean, a target field or a custom value - can colour each interval by whether it sits below, crosses or clears the line. Power BI's native error bars are limited to a few chart types and a few built-in bounds; this is a standalone dot-and-whisker chart with the statistics built in, full interactivity, drill-down, and currency and percentage formats read straight from the data model.

Use Cases • Compare group means fairly - do the confidence intervals overlap or not • Forecasts shown with a high-low range • Measurement or process values against a tolerance band • A/B and experiment results with their uncertainty • Survey estimates with a margin of error • KPI versus target, with the reference line marking the goal

What ships today, what’s next.

Available now15 capabilities

  • Explicit bounds, or confidence intervals computed from raw rows
  • 90/95/99% CI, SEM, SD, IQR or percentile range (mean or median)
  • Reference line at zero, mean, target field or custom value
  • Reference-line cross colouring (below / crosses / above)
  • Marker shape, size, colour, opacity and outline
  • Whisker as line or shaded band, with cap styles
  • Grouped side-by-side intervals with legend and series colours
  • Horizontal or vertical, with logarithmic scale and full axis control
  • Data labels for point and/or bounds; currency and percent formats
  • Interval notices when the data shape blocks the interval
  • Drill down and up with multiple category fields
  • Selection, cross-highlighting, bookmarks, context menu
  • Rich tooltips with n, SD and interval method
  • High-contrast mode support
  • Landing page quick-start guidance

On the roadmap2 planned

  • A connecting line
  • Dynamic format strings.

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