gridfinity-calc/memory-bank/productContext.md

Product Context

Why this project exists?

Gridfinity is a popular modular storage system. While the standard is well-defined (42x42x7mm), users often need to:

1. Figure out how many baseplates fit in a drawer.
2. Determine the maximum height of bins for a specific drawer depth.
3. Scale the system slightly to perfectly fill a drawer that doesn't fit a whole number of 42mm grids.

User Experience

• Input-First: Users should immediately see where to enter their dimensions.
• Instant Feedback: Results should update as they type.
• Flexibility: Toggle between mm and inches easily.
• Precision: Clear output showing "Full Grids" and "Vertical Units".

Success Criteria

• Accurately converts between units.
• Correctly calculates bin height while accounting for baseplate/bin-bottom thickness.
• Provides clear instructions for "fractional" fits (e.g., if a drawer is 100mm, it fits 2.38 grids).