StringerPro: Stair Calculator

StringerPro turns total rise and total run into a code-checked, ready-to-cut stair stringer layout. Built for finish carpenters, framers and deck builders who want one tool that does the stringer job properly, including the bottom step. KEY FEATURES - Fraction-native input. Feet, whole inches and a sixteenths picker that works the way a construction calculator does. Common stops (0, 1/4, 1/2, 3/4) are one tap. - IRC R311.7 code validation. Live green / amber / red badges for riser height (max 7-3/4"), tread depth (min 10"), riser variance, 2x12 throat (min 3-1/2"), comfort (rise plus tread), and pitch angle. - The bottom step handled correctly. The bottom riser is automatically shortened by the tread thickness so walking rises stay uniform once treads are installed, a common source of uneven steps. - Side-view diagram with every dimension labelled. A clean 2D elevation that prints…