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What is the app that measures floor plans?

MeasureFloorPlan is a web app built for exactly this: measuring existing floor plan images rather than drawing new ones. The workflow takes minutes. Upload any floor plan (photo, PDF, listing image, scanned blueprint, or hand sketch), calibrate the scale by marking one known dimension (a labeled wall, a standard 36-inch door, anything you trust), then trace walls to get lengths and trace room outlines to get exact areas, including irregular shapes with angles and curves that resist hand calculation. Because it runs in the browser, there's nothing to install and it works on any device.

It handles the cases where physical measurement isn't possible or practical: properties you haven't visited, homes under consideration from a listing, old blueprints for renovation planning, contractor takeoffs from architect drawings, and appraisal workflows requiring accurate gross living area from plan documents.

Alternatives exist in adjacent categories (scanning apps like magicplan and CubiCasa measure physical rooms via your phone camera to create plans, and CAD tools measure within their own files), but for extracting real measurements from a plan image you already have, MeasureFloorPlan is the direct tool. Try it at measurefloorplan.com.