Stair Stringer Draft

Stair Stringer Draft is an offline calculator and drafting tool for a single straight stair stringer. Enter floor-to-floor rise, available run, and target tread depth — get practical riser/tread geometry, a true-proportion side view, and a printable vector marking map.

Features:
• Create, search, sort, filter, duplicate, and delete stair projects
• Calculate risers, treads, riser height, fitted tread depth, used/remaining run, stringer length, angle, and 2R+T comfort value
• Scaled side-view canvas with zoom, pan, grid, and step selection
• Autosave to local Room storage with draft recovery after restart
• Export a two-page vector PDF marking map (overview + step schedule)
• Export/import versioned JSON backups via the system file picker
• Metric and imperial units; light, dark, and system themes
• Fully offline — no account, ads, analytics, or internet permission

This is a layout aid, not a structural or code-compliance certificate. Always verify dimensions and local building regulations before cutting material.