Circle Gauge · 5 Pro
Measure the diameter of anything round.
Fit the ring to anything round — an avatar, an icon, a round button or a dial — and read its diameter, radius and circumference.
Free to download · Requires macOS 15 or later
What it measures
- Diameter, radius and circumference
- Avatars, profile pictures and round icons
- Round buttons, badges, dials and progress rings
- Circles at any orientation — turn the graduated diameter bar
How to measure a circle with the gauge
Choose the circle gauge
Press ⌃⌥M, then 5. Or hold ⌘ and drag outward from a circle’s centre to draw one.
Fit the ring
Drag the hub to the centre, then drag the ring until it sits on the circle’s edge. With Enhanced Precision, the centre snaps.
Read the diameter
The readout shows the diameter, with radius and circumference. Arrow keys grow or shrink it by one pixel at a time.
Keyboard shortcuts
- 5
- Choose the circle gauge
- ⌘drag
- Draw a gauge from the centre (⌥: edge to edge)
- A
- Swing the diameter bar between horizontal and vertical
- []
- Turn the diameter bar
- ⌘C
- Copy the diameter
Free or Pro?
The Circle Gauge is part of Measure My Pro, a one-time purchase. Before you buy, it opens once for a full session, so you can try it on your own work.
Enhanced Precision — edge snapping, gap detection and a real-pixel loupe — is free and optional. It needs Screen Recording permission; everything else works without it.
Questions and answers
How do I measure the size of a circle on my screen?
Use Measure My’s circle gauge: fit its ring to the circle’s edge and read the diameter. The readout also gives the radius and circumference.
Does the gauge cover what I’m measuring?
No. The ring lies just outside the measured edge and the inside stays clear and click-through, so the circle stays fully visible.
The other instruments
Straight Ruler
Free Lay a ruler on anything and read its length. Free forever. Learn moreCorner Ruler
Pro An L-square that reads width and height from one corner at once. Learn moreCaliper
Pro Point-to-point distance, with ΔX and ΔY for diagonals. Learn moreRectangle Frame
Pro Width × height and aspect ratio of any rectangular area. Learn moreCrosshair
Pro Exact pixel coordinates anywhere, with an optional origin. Learn moreGap
Pro The spacing between two elements, horizontal or vertical. Learn moreAngle
Pro A protractor for angles between 0° and 180°. Learn moreGrid
Pro Column, baseline, square and dot grids across the whole screen. Learn morePixel Probe
Pro One pixel, magnified — with its exact coordinates. Learn more
Measure what you see.
A precision instrument for your screen — one shortcut away.