# Histogram
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This documentation topic is designed for Grafana workspaces that support **Grafana version 12.x**.  
For Grafana workspaces that support Grafana version 10.x, see [Working in Grafana version 10](using-grafana-v10.md).  
For Grafana workspaces that support Grafana version 9.x, see [Working in Grafana version 9](using-grafana-v9.md).  
For Grafana workspaces that support Grafana version 8.x, see [Working in Grafana version 8](using-grafana-v8.md).

The histogram visualization calculates the distribution of values and presents them as a bar chart. The Y-axis and the height of each bar represent the count of values that fall into each bracket while the X-axis represents the value range.

![\[An image showing an example of a histogram visualization in Grafana.\]](http://docs.aws.amazon.com/grafana/latest/userguide/images/viz/histogram-example.png)


## Supported formats
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Histogram visualization supports time series and any table results with one or more numerical fields.

## Display options
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Use these options to refine your visualizations.

**Bucket size**

The size of the buckets. Leave this empty for automatic bucket sizing (\$110% of the full range).

**Bucket offset**

If the first bucket should not start at zero. A non-zero offset shifts the aggregation window. For example, 5-sized buckets that are 0–5, 5–10, 10–15 with a default 0 offset would become 2–7, 7–12, 12–17 with an offset of 2; offsets of 0, 5, or 10, in this case, would effectively do nothing. Typically, this option would be used with an explicitly defined bucket size rather than automatic. For this setting to affect, the offset amount should be greater than 0 and less than the bucket size; values outside this range will have the same effect as values within this range.

**Combine series**

This will merge all series and fields into a combined histogram.

**Line width**

Controls line width of the bars.

**Fill opacity**

Controls the fill opacity of the bars.

**Gradient mode**

Set the mode of the gradient fill. Fill gradient is based on the line color. To change the color, use the standard color scheme field option. Gradient appearance is influenced by the **Fill opacity** setting.
+  **None ** – No gradient fill, this is the default setting.
+  **Opacity** – Transparency of the gradient is calculated based on the values on the Y-axis. Opacity of the fill is increasing with the values on the Y-axis.
+  **Hue** – Gradient color is generated based on the hue of the line color.

## Legend options
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When the legend option is enabled, it can show either the value mappings or the threshold brackets. To show the value mappings in the legend, it’s important that the Color scheme option under standard options is set to Single color or Classic palette. To see the threshold brackets in the legend, set the Color scheme to From thresholds. For more information about the legend, see [Configure a legend](v12-panels-configure-legend.md).

**Legend mode**

Use these settings to define how the legend appears in your visualization.
+  **List ** – Displays the legend as a list. This is a default display mode of the legend.
+  **Table** – Displays the legend as a table.
+  **Hidden** – Hides the legend.

**Legend placement**

Choose where to place the legend.
+  **Bottom ** – Below the graph.
+  **Right** – To the right of the graph.

**Legend Values**

Choose which of the standard calculations to show in the legend. You can have more than one. For more information, see [Calculation types](v12-panels-calculation-types.md).

**Legend calculations**

Choose which calculations to show in the legend. You can select more than one.