Excel - Create a Speedometer Chart Tutorials

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    Home  MS Excel Tutorials  Working with Charts

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    Create a Speedometer Chart

    You can create a really impressive, workable speedometer (or "speedo")

    chart, complete with moving needle, by us ing a combination of doughnuts

    and pie charts. The added touch is that you can control the speedometer via

    a scrollbar.

    Excel's Chart Wizard offers many different types of charts, except,

    unfortunately, a speedometer chart. A speedometer chart provides a slick

    way to represent data. With the hacks in this section, you can create a

    speedometer chart as well as add a scrollbar from the Control Toolbox

    toolbar that will alter the chart and change the data in the worksheet

    simultaneously.

    The first thing you need to do is to set up some data, such as that shown in

    the figure, and create a doughnut chart. Doughnut charts work a bit like pie

    charts, but they can contain multiple series, whereas a pie chart cannot.

    Figure. Data set up for speedometer chart

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    Press Alt/ -~ to show the actual formulas on the worksheet. You also can

    select Tools » Options... » View and check the Formulas option to see the

    formulas, though that's a longer process.

    Now highlight the range B2:B5 and select the Chart Wizard. In Step 1 of the

    Chart Wizard, select the Standard Types tab (this should be the defaultanyway). Then, under Chart Type, select the first doughnut. Click the Next

    button to go to Step 2 of the Wizard and make sure your data is charted in

    rows. Click the Next button to take you to Step 3. You can make changes in

    Step 3 if you need to, but they aren't necessary for this tutorial. Click Next

    to go to Step 4, and make sure the chart ends up as an object in the current

    worksheet (again, this is the default). Placing the chart as an object will make

    it easier to work with as you are setting up the speedometer.

    Figure. Basic doughnut chart

    Highlight the doughnut chart, slowly double-click the largest slice to select it,

    and then select Format Data Series » Options. Set the angle of this slice to

    90 degrees. Click the Patterns tab and set the area and border of this slice to

    None, then click OK. Slowly double-click to highlight each of the other slices in

    turn, then double-click to get back to the Format Data Series dialog and color

    the other three bands as required. The doughnut chart should look like theone in the figure.

    Figure. Doughnut chart with 90% angle and no color or border on the first slice

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    You need to add another series (Series 2) of values to form the slots for the

    dial labels, so again highlight the chart, right-click, select Source Data, and

    then select the Series tab. Click the Add button, which will create a new

    series, and then, under Values, select the range C2:C13. Click the Add

    button again to add a third series (Series 3) to create the needle, and under

    Values, select the range E2:E5.

    Figure. Doughnut chart with multiple series

    At this point, the speedometer is starting to take shape. If you want to add

    labels to the speedometer, you can download a tool for adding them for free

    from John Walkenbach's Chart Tools, at http://j-

    walk.com/ss/excel/files/charttools.htm .

    Part of this add-in, which unfortunately works only on Windows, is designed

    specifically for data labels. It enables you to specify a worksheet range for the

    data labels for a chart series. John's add-in also contains the features

    described in the following list.

    Chart Size

    Enables you to specify an exact size for a chart, or enables you to make

    all charts the same size.

    Export

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    Enables you to save charts as .gif , .jpg, .tif , or .png files.

    Picture

    Converts a chart to a picture (color or grayscale).

    Text Size

    Freezes the size of all text items in a chart. When the chart is resized,the text elements will not change size.

    Chart Report

    Generates a summary report for all charts, or a detailed report for a

    single chart.

    Use the add-in to format Series 2 to display data labels using the range

    D2:D13. Keep Series 2 highlighted, then double-click to bring up the Format

    Data Series dialog. Go to the Patterns tab, and select None for both theBorder and Area.

    Figure. Improved speedometer chart, with labels added

    Highlight Series 3, then right-click it and select Chart Type. Change this

    series to the default pie chart. Yes, it looks strange. But rest assured, if the

    pie chart overlays the doughnut chart, you have done this correctly.

    Figure. Speedometer chart overlaid with a pie chart

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    Next you need to reduce the size of the pie chart you just laid over the

    doughnut. To do this, explode it and reassemble the smaller slices. Select

    one section of the pie chart (two slow clicks on the desired slice will do this)

    and drag it outward. This will explode the pie and make it smaller.

    Figure. Pie chart exploded and resized

    Now select the whole pie, double-click it, and then select Format Data Series

    » Options. Change the Angle of the first slice to 90 degrees. Select each slice

    of pie in turn, then right-click, go to the Format Data Series dialog, then click

    the Patterns tab. Select None for the Border and the Area for all slices except

    the third slice, which needs to have a fill of Black.

    Figure. Speedometer chart with only the third series of pie chart showing color

    If you want to add a legend, highlight the chart, then right-click and select

    Chart Options » Data Labels. Select Legend Key. This produces the

    speedometer as shown in figure. Now move, size, and edit the chart as

    required.

    Figure. Speedometer chart showing legend

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    Now that the speedometer chart is built, you need to create a scrollbar from

    the Control Toolbox toolbar and make the scrollbar and chart talk to each

    other.

    To do this, right-click the toolbar area of the screen (the top of the screenwhere the Standard and Formatting toolbars are located) and select Control

    Toolbox. Now select the scrollbar tool and draw a scrollbar somewhere on the

    worksheet.

    Select the scrollbar, right-click it, and select Properties. This will display the

    Properties dialog. Choose cell F3 as the linked cell, and set the Maximum

    value to 100 and the Minimum value to 0. When you close the Properties

    dialog and move the scrollbar onto the chart, you'll see something like that

    shown in figure.

    Figure. Final speedometer chart

    Clicking the arrows or dragging the slide bar will alter the speedometer, but

    remember, this also will change the data on the worksheet to which it is

    linked.

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