MEASURE STUDIO
Camera geometry · no AI
Ready
CAMERA VIEW
Use rear camera for best results
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Your camera. Actual dimensions.

Capture a photo with a known-size reference, or import one you already have.

4-point perspective calibrationPRIVATE · ON DEVICE
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Reference and object must lie on the same flat surface. Perspective is corrected using a known rectangle; this is not free-space AR.

How to measure accurately

  1. Put an A4 sheet, bank card, or other known rectangle on the same flat plane as what you want to measure.
  2. Take a photo where the corners and target are sharp and visible. Keep the reference reasonably near the target.
  3. Select the reference size, then tap its four corners in order: top-left, top-right, bottom-right, bottom-left in the reference's own orientation.
  4. Choose Length, Area, or Angle. Tap the corresponding endpoints or vertices. Drag any marker to fine-tune its position.
  5. Save the numeric result or export an annotated image. Check important measurements with a tape measure.

Quick estimate: Uses a single pixel-to-length scale and is only appropriate for approximately front-facing targets at the reference's distance. It does not correct perspective.

Important: A single photo cannot measure arbitrary 3D distance without scale or depth information. This tool does not use LiDAR, ARKit, WebXR, or AI.