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Mat Border Calculator
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Fraction to Decimal Conversion Guide
1/8 = 0.125
1/4 = 0.25
3/8 = 0.375
1/2 = 0.5
5/8 = 0.625
3/4 = 0.75
7/8 = 0.875
1. Artwork
Enter dimensions of your artwork in inches, mm, or cm. Use decimals, not fractions. The calculator will subtract 1/4" from each side to eliminate an unsightly gap between artwork and mat.
width
height
2. Frame
Do not enter the overall size of your frame! Instead, measure from the frame's back to take into account the frame rabbet. These numbers will match the plexiglass size.
width
height
3. Mat Borders
By default, this calculator will center your artwork. But, you can choose to creatively offset your artwork here:
4. Single or Double
A double mat places a second mat between the top mat and artwork, creating a "reveal" border effect around your art.
5. Double Mat Reveal
Define the width of the border created by your double mat.
Results
numbers are accurate, but drawing is not to scale
Top Mat
AA
BB
CC
DD
Mat Size ?x? ?x?
Opening Size ?x? ?x?
AA
BB
CC
DD
Your Mat
A
B
C
D
Mat Size ?x? ?x?
Opening Size ?x? ?x?
A
B
C
D
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