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A framing calculator (or picture frame size calculator) helps you get frame dimensions, picture mat size, glass size, and a framing cost estimate. Use this free framing calculator for DIY picture framing and woodworking: enter artwork size, mat borders, and frame moulding width to get outer frame size, glass cut size, and material cost. Our calculator uses industry-standard framing formulas for custom frames for artwork, photos, and prints.
Last updated: February 2, 2026
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Width of the frame moulding
Per side (4 pieces)
Outer Frame = Artwork + Mat Borders + Frame Width × 2
Glass = Mat Outer = Artwork + Mat Borders
Miter Length = (Width + Height) / 2 + Frame Width
Standard mat width
2.5-3.5 inches
Professional mat sizing for single, double, and triple mats
Components included
Art + Mat + Frame
Complete dimension calculations from artwork to finished frame
Glass sizing
Rabbet fit dimensions
Accurate glass cutting dimensions for perfect fit
Miter cuts
4 pieces at 45°
Precise moulding measurements for professional miter joints
Cost components
Frame + Glass + Mat
Budget estimation for materials and supplies
All materials
Complete Cut List
Everything you need for successful DIY framing projects
For 16×20" artwork with 3" mat borders and 1.5" frame moulding:
Outer Frame Size
25" × 29"
Glass Size
22" × 26"
Use this picture frame size calculator to get outer frame dimensions from your artwork size and mat borders. Enter artwork width and height, then mat top, bottom, left, and right; the calculator gives frame outer size, glass size, and picture mat size (mat outer and opening). For a picture frame formula: Frame = Artwork + Mat borders + (Frame moulding × 2) on each side.
This framing cost calculator provides a framing estimate for materials: frame moulding (by length and style), glass area, mat layers, and backing. Choose standard, premium, or metal frame style and single, double, or triple mat to see estimated material cost. For custom framing cost estimates, add labor and any specialty glass (UV, museum) to the calculator result.
Our framing calculator uses professional picture framing formulas to calculate exact dimensions for all frame components. Starting with your artwork size, the calculator adds mat borders, accounts for frame moulding width, and provides precise cutting dimensions for glass, backing, and frame pieces needed for perfect custom framing.
The frame moulding width is added twice (once per side) to get the outer dimensions. Glass and backing are cut to the mat outer size. The miter cut length determines how long each piece of moulding should be measured from corner to corner on the outside edge for perfect 45-degree joints.
Cross-section showing artwork, mat, glass, and frame layers
Professional picture framing consists of multiple layers working together. The artwork sits in the center, protected by mat board that prevents contact with glass. The glass (or acrylic) protects from dust and damage while allowing visibility. The frame moulding surrounds everything, and backing board seals the package. Each component must be precisely sized for proper fit and professional appearance.
Working on other DIY projects? Check out our baluster calculator and stair stringer calculator.
Get Custom Calculator for Your BusinessResult: 25" × 29" outer frame, 22" × 26" glass, 108" moulding needed
Professional proportions with balanced mat borders and standard moulding width.
8×10" photo, 2.5" mat, 1" frame
Result: 15" × 17" finished frame
24×36" canvas, no mat, 2" floater
Result: 28" × 40" floater frame
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Suggested hashtags: #PictureFraming #DIYFraming #CustomFrames #ArtFraming #Calculator