100% Stacked Area Chart

Every year adds up to 100%, so the chart shows shares instead of amounts: how a total splits between cars, motorcycles and bicycles from 2007 to 2025.

  • Try it:
  • Hover a year for shares and values
  • Click a legend item: the rest refill 100%
Get the code JavaScript JSON
About this chart

When a 100% stacked area works

When totals change a lot, a plain stacked area hides how the mix shifts. Scaling every year to 100% takes the total out and leaves only the shares, so a change in the mix is plain to see: here, motorcycles losing more than half their share in 2020.

Good for

  • Market share over the years
  • How a budget or a day is split, year by year
  • Mix changes while the total also moves

Think twice when

  • When the totals matter: use a stacked area
  • Very small parts: thin bands are hard to read
  • Comparing the middle bands: lines show them better
For developers

Get the code.

Built with amCharts 5, a JavaScript library. The JavaScript includes your theme and renderer (canvas or SVG); the JSON also follows the changes you make with the controls.

Docs:100% stacksStacked seriesLegendLine series
// Create root element
// https://www.amcharts.com/docs/v5/getting-started/#Root_element
var root = am5.Root.new("chartdiv");

// Set themes
// https://www.amcharts.com/docs/v5/concepts/themes/
root.setThemes([
  am5themes_Animated.new(root),
  am5themes_Responsive.new(root)
]);

// Create chart
// https://www.amcharts.com/docs/v5/charts/xy-chart/
var chart = root.container.children.push(am5xy.XYChart.new(root, {
  panX: true,                  // drag the plot sideways to pan
  panY: true,                  // ...or up and down
  wheelX: "panX",              // a horizontal wheel or trackpad swipe pans
  wheelY: "zoomX",             // the vertical wheel zooms in on the years
  layout: root.verticalLayout, // the plot on top, the legend under it
  pinchZoomX:true              // pinch to zoom on touch screens
}));

// Add cursor
// https://www.amcharts.com/docs/v5/charts/xy-chart/cursor/
var cursor = chart.set("cursor", am5xy.XYCursor.new(root, {
  behavior: "none" // dragging pans the plot instead of selecting a range
}));
cursor.lineY.set("visible", false); // no horizontal cursor line, only the vertical one

// The data
var data = [{
  "year": "2007",
  "cars": 1587,
  "motorcycles": 650,
  "bicycles": 121
}, {
  "year": "2008",
  "cars": 1567,
  "motorcycles": 683,
  "bicycles": 146
}, {
  "year": "2009",
  "cars": 1617,
  "motorcycles": 691,
  "bicycles": 138
}, {
  "year": "2010",
  "cars": 1630,
  "motorcycles": 642,
  "bicycles": 127
}, {
  "year": "2011",
  "cars": 1660,
  "motorcycles": 699,
  "bicycles": 105
}, {
  "year": "2012",
  "cars": 1683,
  "motorcycles": 721,
  "bicycles": 109
}, {
  "year": "2013",
  "cars": 1691,
  "motorcycles": 737,
  "bicycles": 112
}, {
  "year": "2014",
  "cars": 1298,
  "motorcycles": 680,
  "bicycles": 101
}, {
  "year": "2015",
  "cars": 1275,
  "motorcycles": 664,
  "bicycles": 97
}, {
  "year": "2016",
  "cars": 1246,
  "motorcycles": 648,
  "bicycles": 93
}, {
  "year": "2017",
  "cars": 1318,
  "motorcycles": 697,
  "bicycles": 111
}, {
  "year": "2018",
  "cars": 1213,
  "motorcycles": 633,
  "bicycles": 87
}, {
  "year": "2019",
  "cars": 1199,
  "motorcycles": 621,
  "bicycles": 79
}, {
  "year": "2020",
  "cars": 1110,
  "motorcycles": 210,
  "bicycles": 81
}, {
  "year": "2021",
  "cars": 1165,
  "motorcycles": 232,
  "bicycles": 75
}, {
  "year": "2022",
  "cars": 1145,
  "motorcycles": 219,
  "bicycles": 88
}, {
  "year": "2023",
  "cars": 1163,
  "motorcycles": 201,
  "bicycles": 82
}, {
  "year": "2024",
  "cars": 1180,
  "motorcycles": 285,
  "bicycles": 87
}, {
  "year": "2025",
  "cars": 1159,
  "motorcycles": 277,
  "bicycles": 71
}];

// Create axes
// https://www.amcharts.com/docs/v5/charts/xy-chart/axes/
var xAxis = chart.xAxes.push(am5xy.CategoryAxis.new(root, {
  categoryField: "year",
  // start and end the axis in the middle of the first and last year, so the areas reach the edges
  startLocation: 0.5,
  endLocation: 0.5,
  renderer: am5xy.AxisRendererX.new(root, {
    minorGridEnabled: true, // a grid line for every year, even one whose label is skipped
    minGridDistance: 80     // at least 80px between labels; on narrow screens some are skipped
  }),
  tooltip: am5.Tooltip.new(root, {}) // the cursor shows the year on the axis
}));

xAxis.data.setAll(data);

var yAxis = chart.yAxes.push(am5xy.ValueAxis.new(root, {
  min: 0,   // the axis runs from 0%...
  max: 100, // ...to 100%
  // sums each year's values, which the series need for valueYTotalPercent
  calculateTotals: true,
  numberFormat: "#'%'", // whole numbers with a % sign
  renderer: am5xy.AxisRendererY.new(root, {
    pan:"zoom" // drag along the axis labels to zoom the values
  })
}));

// Add series
// https://www.amcharts.com/docs/v5/charts/xy-chart/series/
function createSeries(name, field) {
  var series = chart.series.push(am5xy.LineSeries.new(root, {
    name: name,
    stacked: true, // each area sits on top of the one before it
    xAxis: xAxis,
    yAxis: yAxis,
    valueYField: field,
    categoryXField: "year",
    // plot each value as its share of the year's total, so the stack always adds up to 100%
    valueYShow: "valueYTotalPercent",
    legendValueText: "{valueY}", // the legend shows the hovered year's value
    tooltip: am5.Tooltip.new(root, {
      pointerOrientation: "horizontal", // the tooltip points sideways at the line
      // name in bold, then the year, its share and the value
      labelText: "[bold]{name}[/]\n{categoryX}: {valueYTotalPercent.formatNumber('#.0')}% ({valueY})"
    })
  }));

  series.fills.template.setAll({
    fillOpacity: 0.5, // half-transparent fills
    visible: true     // line series don't fill by default; this turns it on
  });

  series.data.setAll(data);
  series.appear(1000);
}

createSeries("Cars", "cars");
createSeries("Motorcycles", "motorcycles");
createSeries("Bicycles", "bicycles");

// Add scrollbar
// https://www.amcharts.com/docs/v5/charts/xy-chart/scrollbars/
chart.set("scrollbarX", am5.Scrollbar.new(root, {
  orientation: "horizontal" // drag its grips to zoom in on a range of years
}));

// Add legend
// https://www.amcharts.com/docs/v5/charts/xy-chart/legend-xy-series/
var legend = chart.children.push(am5.Legend.new(root, {
  centerX: am5.p50, // the legend's middle...
  x: am5.p50        // ...at the middle of the chart
}));

legend.data.setAll(chart.series.values);

// Make stuff animate on load
// https://www.amcharts.com/docs/v5/concepts/animations/
chart.appear(1000, 100);

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