1. Upload your floor plan PDF
2. Set your scale — click two points on a known dimension, type the real-world length
3. Create a layer, assign it to a calculator (CHB Wall, Tiles, Ceiling, etc.)
4. Trace — polylines for lengths, polygons for areas, count dots for fixtures
5. Hit Gen BOM → your full Bill of Materials is generated instantly
Every layer is tagged to a specific calculator. No mismatched units. No manual math.The plan IS the estimate.