Picture Frame Calculator

Your details

The horizontal dimension of your photo or artwork.
in
The vertical dimension of your photo or artwork.
in
Width of the mat visible on each side of the artwork. Typical range: 1.5-3 in (4-8 cm).
in
Mat visible above the artwork. Usually equal to side borders.
in
Mat visible below the artwork. Many framers add an extra 0.5 in (1-1.5 cm) at the bottom for optical balance.
in
Width of the frame profile (the wood/metal strip you see from the front). Standard frames are 0.75-2.5 in (2-6 cm).
in
The ledge inside the frame that the mat and glass rest on. Typical value: 0.25 in (0.6 cm). Reduce the inner opening by this much on each side.
in
How much the mat window edge covers the artwork on each side. Keeps the artwork from slipping through. Standard: 0.25 in (0.6 cm).
in
Mat opening heightMedium frame (12-24 in)
9.5

Cut this opening in the mat board vertically.

Mat opening width7.5
Inner frame width12
Inner frame height14.5
Outer frame width15
Outer frame height17.5
Glass / glazing width12
Glass / glazing height14.5
Molding length needed71
Unitsin
Outer width15
Outer height17.5
Inner width12
Inner height14.5
Mat opening W7.5
Mat opening H9.5

Outer frame: 15.00 x 17.50 in

  • The finished frame will be 15.000 x 17.500 in on the wall.
  • Cut the mat window to 7.500 x 9.500 in so the mat edge overlaps the artwork on all sides.
  • The bottom mat border is wider than the top, which creates optical balance and is the standard for professional framing.
  • Buy at least 71.00 in of molding to allow for 4 mitered corners plus waste.

Next stepMark your mat board with the mat opening dimensions, then cut a 45-degree bevel with a mat cutter. Check the glass size matches the inner frame before assembling.

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