Radial Progress Ring

A circular progress ring that sweeps up to a slider-set percentage automatically.

Expression Code

// Radial Progress Ring
// Apply to Trim Paths End on a circle shape layer
// Add a Slider Control named "Percent" to this layer

pct = effect("Percent")("Slider");  // Target percentage, 0-100
duration = 1.2;    // Seconds to sweep up from zero
delay = 0;         // Wait in seconds before the sweep starts

t = Math.max(time - inPoint - delay, 0);
if (duration <= 0) {
  eased = 1;
} else {
  p = Math.min(t / duration, 1);
  eased = 1 - Math.pow(1 - p, 3);  // Cubic ease-out sweep
}
clamp(pct * eased, 0, 100);

Create a shape layer with an Ellipse and a Stroke (no Fill), then add Trim Paths from the Add menu on the shape group. Add a Slider Control named "Percent" to the layer and set it to your target value, e.g. 72. Alt/Option-click the Trim Paths End stopwatch and paste. The ring sweeps from 0 up to the target over the duration — no keyframes needed. AE ellipses trim from the top (12 o'clock) going clockwise, so no rotation is needed; paths pasted in from Illustrator start at 3 o'clock instead — rotate those -90° to start from the top.

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