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How to Measure Anything With Your Phone Camera (AR Ruler)

By DocFila Team · May 3, 2026 · 5 min read

Forgot the tape measure? Your phone has one built in. DocFila's AR ruler uses your camera and motion sensors to measure distance, area, height, and full room dimensions — accurate to about ¼ inch / 6 mm in good lighting.

Measure a single distance

1. Open DocFila → Tools → AR Measure.
2. Move your phone slowly so the camera maps the surface.
3. Tap to drop the start point on one end.
4. Move to the other end, tap again. Distance appears live.
5. Tap Save for a photo with the measurement labelled.

Measure area and height

Switch mode to Area to outline a polygon (rooms, rugs, plots). Height measures vertical distances (door, ceiling, person). Volume calculates packages — handy for shipping quotes.

Measure a whole room

Room mode walks you through scanning all four walls. The output is a labelled floor plan with wall lengths, doors, and windows — perfect for quoting flooring, paint, or furniture fit.

Tips for accuracy

• Good, even lighting matters more than camera quality.
• Move the phone slowly — fast motion confuses the AR tracking.
• Calibrate against a known length (a credit card is 85.6 mm wide) for max accuracy.
• Avoid measuring reflective or glass surfaces — depth sensing struggles there.

Save measurements with photos

Every measurement saves a labelled image. Bundle multiple into a single PDF report for clients (contractors, real-estate agents, movers) using PDF merge.

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