Shop Reference · Picture Framing
Miter Cut Calculator
for mitered moldings with a rabbeted glass opening
01 · Glass dimensions
02 · Molding profile
Face dims describe the molding stock; rabbet dims describe the L-shaped recess cut into its back-inner corner.
03 · Fit allowance (per side)
Cut Lengths · long point to long point
Short pieces (×2)
12 5/8"
Long pieces (×2)
15 5/8"
Frame Layout
All Dimensions
Outer frame (long point)
12 5/8" × 15 5/8"
outside edges of molding
Inner frame (short point)
10 5/8" × 13 5/8"
inner face edge, also the sight opening
Rabbet opening
11 1/8" × 14 1/8"
recess at the back where the glass sits
Glass
11" × 14"
as specified
Notes
- Cut lengths are measured along the outer edge of the molding, long point to long point.
- The inner edge of each cut piece is 2" shorter than the outer (twice the face width).
- Inputs accept decimals like 1.5, or fractions like 1 1/2 or 1/4.
- Cut all four pieces from one continuous run to keep grain and profile aligned around the corners.
- Verify the rabbet depth separately; it has to clear glass plus mat plus backer plus retention hardware.