# Painter calculator pricing notes

The bundled Canada and U.S. values are editable ballpark starting points. Contractors must review them for their own market, crew, products, overhead and minimum project size.

Interior rooms are measured from length, width and selected height:

- walls: `2 × (length + width) × height`
- ceilings: `length × width`
- baseboards: `2 × (length + width)`

The base assumes two finish coats, standard preparation, professional mid-grade paint, masking, protection, labour and cleanup. Ordinary openings are not subtracted because cutting-in and masking offset much of the reduced painted area.

Percentage adjustments are calculated from the relevant original component and added; they do not compound. Fixed door, accent-wall and stairwell allowances are added afterward. Tax is applied last when enabled.

Wallpaper removal, popcorn-ceiling removal, water damage, major plaster work, new drywall, old glossy trim and cabinet painting are flagged for an on-site assessment and excluded from the automatic range.
