Picture Frame
Calculate picture frame outer and inner dimensions, mat and glass size, and molding length for custom framing of artwork, photos, posters, and canvas prints.
Advanced Settings
About This Calculator
Our Picture Frame Size Calculator helps artists, photographers, DIY enthusiasts, and professional framers determine the exact dimensions needed for custom picture framing. Whether you are framing a family photo, an art print, a canvas gallery wrap, or a poster, this tool computes the precise outer frame dimensions, inner frame opening, glass size, mat dimensions, and total molding length required.
The calculator uses the standard framing formula: outer frame height equals the picture height plus twice the sum of mat height and border width, adjusted for rabbet overlap and a small fudge factor. The molding length (perimeter) equals twice the sum of outer height and outer width. With optional matting support and advanced settings for rabbet width and fudge factor, you get professional-grade measurements for any custom framing project.
Regional Notes
India: Custom framing is widely available in local markets and frame shops. Photo sizes such as 4x6, 5x7, 8x10, and 12x18 inches are common. Standard frame molding widths range from 0.5 to 2 inches. Matting is commonly used for wedding photos, diplomas, and wall art. Measurements are typically in inches, though some shops also work in centimeters.
United States: Standard frame sizes include 4x6, 5x7, 8x10, 11x14, 16x20, 18x24, 20x24, and 24x36 inches. Frame border widths vary from 0.75 inches for thin modern frames to 3+ inches for ornate traditional frames. Most framing shops use the same formulas covered by this calculator, with rabbet widths of 1/4 inch and fudge factors of 1/16 to 1/8 inch.
United Kingdom: Common photo sizes include 4x6, 6x8, 7x5, 8x10, A4 (8.3x11.7), and A3 (11.7x16.5) inches. Custom framing services are available at high street shops and independent framers. Standard molding widths and practices are similar to US framing conventions. This calculator works with imperial inches, which remain the standard for UK framing materials.
Frequently Asked Questions
How do I calculate the picture frame size I need?
Measure your artwork height and width, then add twice the frame border width plus any mat spacing. The outer frame dimensions equal picture size plus (mat height + border width) x 2 on each side. Use this calculator to get precise inner and outer dimensions, glass size, and molding length for custom framing.
What is matting and why should I use it in a picture frame?
Matting is the cardboard or paper border placed between the artwork and the frame. It creates visual breathing room, protects the artwork from touching the glass, enhances presentation, and allows you to fit non-standard artwork sizes into standard frames. Mat measurements are entered separately for height and width on each side.
What is the standard picture frame size for 4x6 photos?
A standard 4x6 photo typically fits in an 8x10 frame with a 2-inch mat border, or in an 11x14 frame with a wider mat. Without matting, a 4x6 photo needs a frame with inner dimensions very close to 4x6 plus the rabbet overlap, so an 8x10 frame with a mat is the most common choice.
What is rabbet width in picture framing?
Rabbet width is the recessed groove inside the frame where the glass, mat, artwork, and backing sit. It typically ranges from 1/8 to 1/4 inch. The rabbet width reduces the visible area, so you should account for it when calculating mat and glass sizes to ensure your artwork is fully visible.
How do I measure molding length for a custom picture frame?
Molding length is the total perimeter of the outer frame dimensions. Measure the outer frame height and width, then use the formula: (outer height + outer width) x 2. Add 10-15% extra for mitered corner waste if cutting your own frame. Our calculator computes the exact molding length in inches.
What is the difference between inner and outer frame dimensions?
The outer frame dimensions are the total external height and width of the finished frame including the molding. The inner frame dimensions refer to the viewable opening where the glass and mat sit. The difference between outer and inner dimensions equals twice the frame border width, accounting for the molding thickness.
Can I use this calculator for canvas frame sizing?
Yes, this calculator works for canvas prints, gallery wraps, posters, photographs, and any flat artwork. For canvas gallery wraps without a mat, set the mat height and mat width to zero. The calculator will still compute proper glass and outer frame dimensions based on your artwork size and chosen border width.
What fudge factor should I use for picture framing?
A standard fudge factor of 0.05 inches is recommended to account for minor measurement errors and material expansion. You can adjust this value in the advanced settings if you need a tighter or looser fit. Professional framers typically use 1/16 to 1/8 inch (0.0625-0.125 inches) of extra space.