Picture Frame Calculator
Calculate custom picture frame dimensions with mat size, border width, and rabbet adjustments for perfect framing.
Picture Frame Calculator
Ordering a custom picture frame requires precise measurements. This picture frame calculator takes your artwork or photo dimensions and computes all the frame sizes you need—outer frame dimensions, inner frame (rabbet) dimensions, mat opening size, glaze size, and total molding length. Just enter your picture width and height, choose inches or centimeters, and adjust the frame settings.
Add a mat border around your artwork by setting the top, bottom, left, and right mat margins independently. The calculator also accounts for the rabbet width (the groove that holds the picture) and a small fudge factor for ease of fitting. The border width controls how thick the frame moulding is. All the measurements are updated instantly so you can dial in the exact look you need before heading to the workshop or placing an order.
For other home decor sizing tools, check out the Rug Size Calculator and Bathroom Mirror Size Calculator.
Frequently Asked Questions
What is the rabbet in a picture frame?
The rabbet is the recessed groove cut into the back of the frame moulding that holds the glazing, mat, artwork, and backing board. Its width affects the inner frame opening size, which must be slightly larger than the mat opening for a proper fit.
How much mat border should I leave around my artwork?
A common rule is to leave equal mat borders on all sides, with the bottom margin slightly wider (about ¼ inch more) to offset the visual weight. This calculator lets you set each side independently so you can experiment with different proportions.
What is the fudge factor in frame measurements?
The fudge factor adds a tiny amount of extra space to the inner frame dimensions so the artwork and mat stack fits comfortably without forcing. A value of 0.05 inches (about 1 mm) is standard for most framing projects.
How do I calculate moulding length?
Moulding length is the perimeter of the outer frame: 2 × (outer height + outer width). This tells you how much frame stock to buy or cut. The calculator displays this automatically based on your settings.
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