Notes
Glass/backing size is calculated as art size plus mat borders. Linear footage estimate uses glass perimeter + (molding width × 8) + 1 inch waste allowance. Verify with your framing method and materials.
FRAMING
Picture Frame Mat Window & Miter Offset Calculator
Calculate exact glass sizes, mat window drops, and linear molding footage to reduce waste and measurement errors.
Fabrication cut sheet
Glass & backing size
Width × height
Molding required
Includes miter offsets + 1" waste
Mat cutter blade drops (from outer edge)
Left
Right
Top
Bottom
Preview
ART
Artwork & frame dimensions
1. Exact art size
2. Mat borders
3. Molding specs
Used to estimate linear footage including 45° miter offsets and 1" waste.