Free picture frame molding calculator: inside W×H inches, moulding face width, 45° miter long-side cuts, raw linear feet, waste %, fudge inches, outside frame size, optional 8 ft stick count, charts—DIY planning, not conservation lab spec.
Important: Mitered frames assume square corners and a single face width number for all four sticks. Real profiles have rabbets, spring angles, and chop-saw kerf—use this as a first-order cut list, then dry-fit and sneak up on length.
Summary: Enter the inside opening (sight / glass reference, inches), the moulding face width (inches from sight line to outside back cut), plus waste and a fudge allowance. The tool outputs each miter’s long-side cut length, total linear inches/feet, outside frame size, and optional rough stick count from a stock length.
Picture frame molding calculator (45° miters)
Standard chop-shop rule used here: outside cut length = inside side + 2 × face width for each rail (same width all around).
Formulas (short)
Horizontal sticks (top/bottom): CH = W + 2w.
Vertical sticks (left/right): CV = H + 2w.
Raw perimeter (four long sides): P = 2CH + 2CV = 2(W + H) + 8w.
Order length: P × (1 + waste%) plus optional fixed fudge inches.
