Picture Frame Matting Calculator

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Construction

Picture Frame Matting Calculator computes mat board dimensions and frame opening size. Formula: Window opening = Image dimensions + (2 × border width).

Formula

Window = Image + (2 × border); Mat Area = Window Width × Window Height
  • Standard mat borders: 1.5-3 inches all around
  • Larger bottom border (2.5-3.5 in) creates visual balance

8×10 with 2in border

Inputs
  • Image Width: 8 in
  • Image Height: 10 in
  • Mat Border Width: 2 in

Window: (8+4)×(10+4) = 12×14 in

Frequently asked questions

What is mat border?
Decorative frame edge around the image; standard 1.5–3 inches
Should all borders be equal?
Typically yes, except larger bottom border for visual balance