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Documentation Index

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Meter

The Meter component visualizes a scalar measurement within a known range. Unlike Progress, which shows task completion, Meter displays current values like disk usage, battery level, or temperature.

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Import

import { Meter } from '@base-ui/react/meter';

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Anatomy

The Meter component consists of five parts:
  • <Meter.Root> - The container that provides context
  • <Meter.Track> - The background track
  • <Meter.Indicator> - The filled portion showing the value
  • <Meter.Label> - A label for the meter
  • <Meter.Value> - Displays the formatted value
<Meter.Root value={65}>
  <Meter.Label>Storage</Meter.Label>
  <Meter.Track>
    <Meter.Indicator />
  </Meter.Track>
  <Meter.Value />
</Meter.Root>

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Basic Usage

function StorageMeter() {
  return (
    <Meter.Root value={65} min={0} max={100}>
      <Meter.Label>Disk Usage</Meter.Label>
      <Meter.Track>
        <Meter.Indicator />
      </Meter.Track>
      <Meter.Value />
    </Meter.Root>
  );
}

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Key Features

  • Accessible: Uses the ARIA meter role for screen readers
  • Formatted values: Automatic number formatting with Intl.NumberFormat
  • Customizable range: Configure min and max values
  • Locale support: Format numbers according to user locale
  • Unstyled: Complete styling control

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Component Props

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Root

The root container that manages the meter state and provides accessibility attributes. Props:
  • value (number, required): The current value
  • min (number): The minimum value (default: 0)
  • max (number): The maximum value (default: 100)
  • format (Intl.NumberFormatOptions): Options to format the value
  • locale (Intl.LocalesArgument): The locale for number formatting
  • getAriaValueText (function): Custom function to generate aria-valuetext
  • Renders a <div> element with role=“meter”

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Track

The background track of the meter. Props:
  • Renders a <div> element
  • Accepts all standard HTML div attributes

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Indicator

Visualizes the position of the value along the range. Props:
  • Renders a <div> element
  • Width is automatically set based on the value
  • Accepts all standard HTML div attributes

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Label

A label for the meter. Props:
  • Renders a <label> element
  • Automatically associates with the meter for accessibility

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Value

Displays the formatted current value. Props:
  • Renders a <span> element
  • Automatically displays the formatted value

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Styling

<Meter.Root value={75} className="meter-root">
  <Meter.Label className="meter-label">CPU Usage</Meter.Label>
  <Meter.Track className="meter-track">
    <Meter.Indicator className="meter-indicator" />
  </Meter.Track>
  <Meter.Value className="meter-value" />
</Meter.Root>

.meter-root {
  width: 300px;
}

.meter-label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 600;
  font-size: 14px;
}

.meter-track {
  position: relative;
  width: 100%;
  height: 8px;
  background-color: #e5e7eb;
  border-radius: 9999px;
  overflow: hidden;
}

.meter-indicator {
  background-color: #3b82f6;
  transition: width 0.3s ease;
  border-radius: 9999px;
}

.meter-value {
  display: block;
  margin-top: 0.5rem;
  font-size: 14px;
  color: #6b7280;
}

​
Common Patterns

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Color-Coded Meter

Change indicator color based on the value: 
function BatteryMeter({ value }) {
  const getColor = (val) => {
    if (val < 20) return '#ef4444'; // red
    if (val < 50) return '#f59e0b'; // orange
    return '#22c55e'; // green
  };

  return (
    <Meter.Root value={value}>
      <Meter.Label>Battery Level</Meter.Label>
      <Meter.Track>
        <Meter.Indicator style={{ backgroundColor: getColor(value) }} />
      </Meter.Track>
      <Meter.Value />
    </Meter.Root>
  );
}

​
Formatted Values

<Meter.Root 
  value={1250} 
  min={0} 
  max={2000}
  format={{ style: 'unit', unit: 'gigabyte' }}
  locale="en-US"
>
  <Meter.Label>Storage Used</Meter.Label>
  <Meter.Track>
    <Meter.Indicator />
  </Meter.Track>
  <Meter.Value />
</Meter.Root>

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Custom Value Text

<Meter.Root 
  value={7.5} 
  min={0} 
  max={10}
  getAriaValueText={(formatted, value) => `${value} out of 10`}
>
  <Meter.Label>Rating</Meter.Label>
  <Meter.Track>
    <Meter.Indicator />
  </Meter.Track>
  <Meter.Value />
</Meter.Root>

​
Multiple Segments

function SegmentedMeter({ value }) {
  return (
    <Meter.Root value={value}>
      <Meter.Label>Performance</Meter.Label>
      <Meter.Track style={{ display: 'flex', gap: '2px' }}>
        {[0, 25, 50, 75].map((threshold, i) => (
          <div
            key={i}
            style={{
              flex: 1,
              height: '100%',
              backgroundColor: value > threshold ? '#3b82f6' : '#e5e7eb',
              borderRadius: '4px',
            }}
          />
        ))}
      </Meter.Track>
      <Meter.Value />
    </Meter.Root>
  );
}

​
Vertical Meter

<Meter.Root value={65}>
  <Meter.Label>Volume</Meter.Label>
  <Meter.Track 
    style={{
      width: '8px',
      height: '200px',
      display: 'flex',
      flexDirection: 'column-reverse',
    }}
  >
    <Meter.Indicator />
  </Meter.Track>
  <Meter.Value />
</Meter.Root>

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