Fan charts visualize probabilistic forecasts by drawing a central estimate surrounded by progressively wider shaded bands for successively wider confidence intervals. They are standard in central bank inflation reports, epidemiological projections, and any domain where communicating forecast uncertainty is as important as the point estimate.

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date	forecast
2024-Q1	102
2024-Q2	105
2024-Q3	109
2024-Q4	114
2025-Q1	118
2025-Q2	122

{
  "data": [
    {
      "date": "2024-Q1",
      "forecast": 102,
      "p25": 98,
      "p75": 106,
      "p12": 94,
      "p88": 110,
      "p05": 89,
      "p95": 115
    },
    {
      "date": "2024-Q2",
      "forecast": 105,
      "p25": 99,
      "p75": 111,
      "p12": 92,
      "p88": 118,
      "p05": 86,
      "p95": 124
    },
    {
      "date": "2024-Q3",
      "forecast": 109,
      "p25": 100,
      "p75": 118,
      "p12": 90,
      "p88": 128,
      "p05": 82,
      "p95": 136
    },
    {
      "date": "2024-Q4",
      "forecast": 114,
      "p25": 102,
      "p75": 126,
      "p12": 88,
      "p88": 140,
      "p05": 78,
      "p95": 150
    },
    {
      "date": "2025-Q1",
      "forecast": 118,
      "p25": 103,
      "p75": 133,
      "p12": 85,
      "p88": 151,
      "p05": 74,
      "p95": 162
    },
    {
      "date": "2025-Q2",
      "forecast": 122,
      "p25": 104,
      "p75": 140,
      "p12": 82,
      "p88": 162,
      "p05": 70,
      "p95": 174
    }
  ],
  "series": [
    {
      "type": "fan",
      "xKey": "date",
      "yKey": "forecast",
      "bands": [
        {
          "lowerKey": "p25",
          "upperKey": "p75",
          "fill": "#6366f180",
          "label": "50%"
        },
        {
          "lowerKey": "p12",
          "upperKey": "p88",
          "fill": "#6366f150",
          "label": "75%"
        },
        {
          "lowerKey": "p05",
          "upperKey": "p95",
          "fill": "#6366f130",
          "label": "90%"
        }
      ],
      "stroke": "#4f46e5",
      "strokeWidth": 2
    }
  ],
  "title": {
    "text": "GDP Growth Forecast"
  }
}

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A fan chart shows a central forecast line surrounded by progressively wider shaded bands representing increasing uncertainty intervals (e.g. 50%, 75%, 95% confidence).

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