How to Frame a Picture/Calculate the sizes

• Keep a workbook of notes and measurements, so that you can track back specifics
• Extra space at bottom of frame, unless frame re-use needed.
• Always measure off the frame

Matt width - 5cm.

The calculations are in centimeters.

	Width	Height
Artwork	<ArtWidth>	<ArtHeight>
Inner edge (red)	<ArtWidth> - 1	<ArtHeight> - 1	Need overlap to keep picture in place
Matt size (green)	<ArtWidth>-1 + (2*<MattWidth>)	<ArtHeight>-1 + (2*<MattHeight>) +1	extra matt at bottom to stop optical illusion of frame leaning forward
Frame size (blue)	<ArtWidth>-1+(2*<MattWidth>) +(2*<FrameWidth>)	<ArtHeight>-1+(2*<MattHeight>)+1 +(2*<FrameHeight>)

Which means that ...

you need this much frame prior to cutting: left + right + top + bottom

2*(<ArtWidth>-1+(2*<MattWidth>)+(2*<FrameWidth>))+ 2 * (<ArtHeight>-1+(2*<MattHeight>)+1+(2*<FrameHeight>)) = (2*<ArtWidth>)-2+(4*<MattWidth>)+(4*<FrameWidth>)+ (2*<ArtHeight>)+(4*<MattHeight>)+(4*<FrameHeight>)

Measuring for Mounts

Someone should merge this section into the above.

Calculating the Mount Size (to be cut from a sheet of mount board).

1. Decide how much of the picture you want to show (add to, or take away from the art size) = WINDOW SIZE.
2. Decide how much mount you want around the window (margins).
   • Top and both sides are the same.
   • For bottom margin allow extra 20% to compensate for the optical illusion which makes the bottom border seem narrower than it actually is.
   • Standard margin sizes:
     • Top and sides 50mm, bottom 65mm.
     • Top and sides 65mm, bottom 75mm.
     • Top and sides 75mm, bottom 90mm.
   • Allow for width of frame rebate by adding that amount to each margin width = MARGIN WIDTH.
3. Therefore MOUNT HEIGHT = rebate allowance + top margin + window height + bottom margin + rebate allowance.
4. Therefore MOUNT WIDTH = rebate allowance + right margin + window width + left margin + rebate allowance.
5. Therefore MOUNT SIZE = MOUNT HEIGHT * MOUNT WIDTH