Features

Construction drawings often have multiple scales on a single page — a site overview at 1:500 and detail sections at 1:50. BidScoper lets you define rectangular viewport regions and calibrate each independently using the two-point tool. Click two points of known distance, enter the real-world measurement, and every measurement within that viewport automatically uses the correct scale. Visual region boundaries make it obvious which scale applies where.

Assembly templates use a safe recursive descent parser (no eval) to compute material quantities from measurements. For example, the Concrete Sidewalk 32 MPa template takes your measured area and computes: concrete volume = area × thickness × (1 + waste%), Granular A volume = area × base thickness. Outputs are evaluated in topological order so dependent calculations (like rebar tonnes from rebar kg) resolve correctly. Variables can be overridden per measurement for site-specific conditions.

Real-world areas have obstructions — manholes, catch basins, utility openings. BidScoper stores polygon geometry in a GeoJSON-like format: coordinates = [outerRing, ...holes]. The Shoelace formula calculates the outer area, subtracts each hole area, and gives you net area. The cutout tool uses the same polygon tracing workflow — no separate CAD-style interface. This matters because a 1.2m diameter manhole in a 100m² sidewalk is 1.1m² of concrete you don't need to pour.

BidScoper exports two formats: CSV with all measurements, computed outputs, variable values, and assembly template assumptions — ready to drop into your bid spreadsheet. Annotated PDF with your measurement markups overlaid on the original plan pages — defensible documentation for the bid package. The CSV includes every variable value and formula used, so anyone reviewing the bid can trace exactly how quantities were derived.