Gauge Charts in JavaScript

How to make a D3.js-based gauge chart in javascript.

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Plotly is a free and open-source graphing library for JavaScript. We recommend you read our Getting Started guide for the latest installation or upgrade instructions, then move on to our Plotly Fundamentals tutorials or dive straight in to some Basic Charts tutorials.

Basic Gauge

A radial gauge chart has a circular arc, which displays a single value to estimate progress toward a goal. The bar shows the target value, and the shading represents the progress toward that goal. Gauge charts, known as speedometer charts as well. This chart type is usually used to illustrate key business indicators.

The example below displays a basic gauge chart with default attributes. For more information about different added attributes check indicator tutorial.

var data = [
	{
		domain: { x: [0, 1], y: [0, 1] },
		value: 270,
		title: { text: "Speed" },
		type: "indicator",
		mode: "gauge+number"
	}
];

var layout = { width: 600, height: 500, margin: { t: 0, b: 0 } };
Plotly.newPlot('myDiv', data, layout);

Add Steps, Threshold, and Delta

The following examples include "steps" attribute shown as shading inside the radial arc, "delta" which is the difference of the value and goal (reference - value), and "threshold" to determine boundaries that visually alert you if the value cross a defined threshold.

var data = [
  {
    domain: { x: [0, 1], y: [0, 1] },
    value: 450,
    title: { text: "Speed" },
    type: "indicator",
    mode: "gauge+number+delta",
    delta: { reference: 380 },
    gauge: {
      axis: { range: [null, 500] },
      steps: [
        { range: [0, 250], color: "lightgray" },
        { range: [250, 400], color: "gray" }
      ],
      threshold: {
        line: { color: "red", width: 4 },
        thickness: 0.75,
        value: 490
      }
    }
  }
];

var layout = { width: 600, height: 450, margin: { t: 0, b: 0 } };
Plotly.newPlot('myDiv', data, layout);

Custom Gauge Chart

The following example shows how to style your gauge charts. For more information about all possible options check our reference page.

var data = [
  {
    type: "indicator",
    mode: "gauge+number+delta",
    value: 420,
    title: { text: "Speed", font: { size: 24 } },
    delta: { reference: 400, increasing: { color: "RebeccaPurple" } },
    gauge: {
      axis: { range: [null, 500], tickwidth: 1, tickcolor: "darkblue" },
      bar: { color: "darkblue" },
      bgcolor: "white",
      borderwidth: 2,
      bordercolor: "gray",
      steps: [
        { range: [0, 250], color: "cyan" },
        { range: [250, 400], color: "royalblue" }
      ],
      threshold: {
        line: { color: "red", width: 4 },
        thickness: 0.75,
        value: 490
      }
    }
  }
];

var layout = {
  width: 500,
  height: 400,
  margin: { t: 25, r: 25, l: 25, b: 25 },
  paper_bgcolor: "lavender",
  font: { color: "darkblue", family: "Arial" }
};

Plotly.newPlot('myDiv', data, layout);