This architectural scale tool measures linear wall dimensions and room square footage directly from uploaded raster blueprint drawings. General contractors, interior designers, real estate appraisers, and DIY renovators can calibrate digital floor plans and take accurate takeoff measurements without CAD software.

### Two-Point Calibration and Area Measurement The measurement engine uses client-side HTML5 Canvas coordinate geometry:

- **Image Ingestion:** Loads high-resolution architectural plans (JPG or PNG) and scales them to fit an interactive 900-pixel canvas viewport. - **Reference Calibration:** Enter a known reference dimension (such as a 10-foot exterior wall or 3-foot doorway). Clicking two endpoints along that known dimension establishes the exact scale ratio ($R = \text{Known Feet} / \text{Pixel Distance}$). - **Polygon Area Takeoff:** Clicking four sequential corners of a room calculates width and height in calibrated feet, returning estimated enclosed floor area in square feet.

### Practical Measurement Example Suppose a contractor calibrates a residential floor plan: - **Known Wall Dimension:** 10 feet - **Canvas Distance Between Points:** 200 pixels - **Calculated Scale Factor:** $10\text{ ft} / 200\text{ px} = 0.05\text{ ft/px}$

**Room Dimension Takeoff:** 1. Point 1 to Point 2 span across room width measures 300 pixels: $300 \times 0.05 = \mathbf{15.0\text{ ft}}$. 2. Point 2 to Point 3 span across room length measures 400 pixels: $400 \times 0.05 = \mathbf{20.0\text{ ft}}$. 3. Four-corner room area evaluates to $15\text{ ft} \times 20\text{ ft} = \mathbf{300\text{ sq ft}}$.

### In-Browser Security & Zero Transit All image rendering and coordinate calculations occur locally within your browser's canvas memory. Blueprints, construction drawings, and property layouts are never uploaded to any cloud server.