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Gauge Chart (Speedometer Meter)

Angular gauge meter for system KPIs, health indexes, and target progress with interactive score controls and colored performance zones.

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#gauge#meter#speedometer#kpi#performance#health
Customization Guides & Code Snippets

◆Dynamic Needle Angle Calculation (180° to 0°)

Calculate needle angle using `const ang = 180 - (value / 100) * 180;` and trigonometry coordinates so the needle rotates smoothly from the bottom left around to the bottom right.

const ang = 180 - (value / 100) * 180;
const length = (iR + 2 * oR) / 3;
const sin = Math.sin(-RADIAN * ang);
const cos = Math.cos(-RADIAN * ang);

◆Defining Tiered Health Zones with Pie & Cell

Render a semi-circle track using startAngle={180} and endAngle={0} with 4 colored Cell slices (Critical #ff6b6b, Fair #ffd166, Good #4a9eff, Optimal #00e5a0).

When to use a Gauge Chart (Speedometer Meter)

A Gauge Chart (Speedometer Meter) is ideal for developers and designers who need to display data clearly and effectively. Use this chart type when:

  • ✓Displaying a single KPI value against a target (e.g. 78% of goal)
  • ✓Performance scores and health metrics
  • ✓Real-time monitoring dashboards
  • ✓Showing progress toward a goal in a compact format
Tips for Recharts Gauge Chart (Speedometer Meter)
TIP 1Use color zones (green/yellow/red) to show thresholds at a glance
TIP 2Always display the numeric value below or inside the gauge
TIP 3Keep the gauge half-circle — full circles are harder to read
TIP 4Animate the needle on load for better visual impact
TIP 5Pair with a trend indicator (↑ or ↓) to show change vs previous period
Key Recharts Props
PROPTYPEDESCRIPTION
dataarrayArray of objects with your data values
dataKeystringThe key in your data objects to use for bar height
fillstringBar color — accepts hex, rgb, or CSS variable
radius[number,number,number,number]Corner radius [topLeft, topRight, bottomRight, bottomLeft]
stackIdstringGroup bars with the same stackId into a stacked bar
Frequently Asked Questions

What is a gauge chart (speedometer chart) and when should you use it?

A gauge chart (also known as a speedometer or dial chart) uses a radial needle and color-coded zones to visualize a single metric against target benchmarks. It is best used for executive KPI cards, SLA compliance monitors, satisfaction scores (CSAT), and performance health checks.

How do you create a radial gauge chart in React?

In Recharts, render a half-circle <Pie> using startAngle={180} and endAngle={0} with colored <Cell> segments, and calculate a custom SVG needle using trigonometric angles (sin/cos) positioned dynamically at cx and cy.

What is the difference between a gauge chart and a progress bar?

While both display progress toward a goal, a gauge chart uses an angular dial with distinct colored thresholds (e.g. Critical, Fair, Optimal) providing immediate high-stakes status recognition, whereas a progress bar is a linear horizontal indicator.

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