Gauge Chart Maker

Gauge charts (also called speedometer or dial charts) show one value against a scale, the way a car's speedometer shows current speed against the top of the dial. Two visual styles cover nearly every use: a needle sweeping across a marked arc, or a filled arc that grows and shrinks like a battery indicator. Either way, the background is usually split into color-coded zones — commonly red, yellow, and green — so a viewer reads the status of the metric before reading the number itself.

A gauge chart is a snapshot, not a trend: it shows where a value sits right now, not how it got there. If the question is whether a metric is moving in the right direction over time, a line chart or sparkline answers it better. Gauge charts also don't scale well past one or two metrics on a page — that's what a bullet chart is for, since its compact horizontal bar packs a target, a range, and an actual value into a fraction of the space a gauge needs, making it the better pick when a dashboard has to show many metrics side by side rather than one at a glance.