Matting calculator


The calculator below gives the sizes for the matting of a frame.

• The darker values are the sizes of the matting and the amount of white on the paper that is visible around the photo. Of course, when the photo is printed larger than the inner dimensions of the matte than part of the photo will disappear behind the matte. In that case the calculator gives a negative value for the white area, and a pop-up shows up to warn for this.

Determining the golden ratio of a matte =>
[situation A] [situation B] [situation C] [situation D] [situation E]

• The lighter grey values are the overlaps between the paper and the matte. A pop-up will show up to warn in case the paper size is smaller than the inner dimension of the matte.

• Ususally the frame height at the top is made a bit smaller than the one at the bottom, giving a more balanced look. This height difference can be set manually, or you can check the box "height difference according to golden ratio", in which case the height difference is calculated according to the golden ratio. I personally think the difference is often a bit too big when using the golden ration, so I set it manually.


To the right it can be seen how the golden ratio is determined, where the white part is the matte.

A) The photo centered on the matte.

B) Position the photo in the upper left corner.

C) Divide the empty spaces below and to the right in two equal parts. Draw a line from the lower left corner of the photo to the point were the horizontal center line meets with the right side of the matte. Then, mark a point where this line crosses the vertical center line.

D) Place the photo with the lower right corner on the marked point.

E) Now the photo is positioned according to the golden ratio.






This calculator works just as well for portrait orientation, in that case just ignore the fact that the scheme below is landscape oriented. The unit of the sizes doesn't matter, as long as you are consistent and use the same unit for all inputs. That being said, the preset values for the paper dimensions and outer matte dimensions are in mm, so keep that in mind when using those preset values.

Outer matte dimensions (w×h):


600 × 500 / 500 × 400 / 400 × 300 / 300 × 240 / 250 × 200 / 200 × 150 (sizes in mm)

Inner matte dimensions (w×h):



Paper dimensions (w×h):


A2 / A3 / A4 / A5 / A6 (sizes in mm)

Photo dimensions (w×h):



Height difference:


Or height difference according to golden ratio:





























































































































Note: This scheme is displayed fine in Firefox, Chrome and Opera. IE has some minor issues, and Edge is a total disaster. Since I am doing this for fun in my spare time, I do not have the knowledge to fix it to make it look good in those two browsers as well. Microsoft simply seems to be unable to make browsers that work smoothly....