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DIY Framing Tool

Framing Calculator - Picture Frame Size Calculator & Custom Frame Calculator

Free framing calculator for DIY picture framing projects. Calculate frame dimensions, mat borders, glass size, and material costs with professional accuracy. Our calculator uses industry-standard framing formulas to help you create perfectly sized custom frames for artwork, photos, and prints.

Last updated: December 15, 2024

Precise frame dimension calculations
Mat border sizing guidance
Material cost estimation

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Framing Calculator
Calculate frame dimensions and materials for picture framing

Artwork Dimensions

Mat Border Width

Width of the frame moulding

Frame Dimensions

Outer Frame
25.00 × 29.00 inches
Glass Size
22.00 × 26.00 inches

Material Dimensions

Mat Opening:16.00 × 20.00 inches
Mat Outer:22.00 × 26.00 inches
Backing:22.00 × 26.00 inches
Frame Length:108.00 inches
Miter Cut Length
27.00 inches

Per side (4 pieces)

Glass Area
572.00 sq inches

Cost Estimate

Frame Moulding:$864.00
Glass/Acrylic:$1144.00
Mat Board:$10.00
Backing:$5.00
Total Estimate:$2023.00
Standard Framing Project
Professional Tips
  • Use conservation-quality materials for valuable artwork
  • Ensure proper glass cleaning before assembly
Calculation Formula

Outer Frame = Artwork + Mat Borders + Frame Width × 2
Glass = Mat Outer = Artwork + Mat Borders
Miter Length = (Width + Height) / 2 + Frame Width

Picture Frame Calculator Types & Applications

Mat Border Calculator
Calculate mat dimensions and border widths for professional matting

Standard mat width

2.5-3.5 inches

Professional mat sizing for single, double, and triple mats

Custom Frame Size Calculator
Calculate outer frame dimensions for any artwork size

Components included

Art + Mat + Frame

Complete dimension calculations from artwork to finished frame

Glass Size Calculator
Determine exact glass dimensions for custom framing

Glass sizing

Rabbet fit dimensions

Accurate glass cutting dimensions for perfect fit

Frame Moulding Calculator
Calculate frame moulding length and miter cuts

Miter cuts

4 pieces at 45°

Precise moulding measurements for professional miter joints

Frame Cost Calculator
Estimate material costs for custom framing projects

Cost components

Frame + Glass + Mat

Budget estimation for materials and supplies

DIY Frame Calculator
Complete framing guide for DIY picture framing

All materials

Complete Cut List

Everything you need for successful DIY framing projects

Example Framing Calculation

For 16×20" artwork with 3" mat borders and 1.5" frame moulding:

Outer Frame Size

25" × 29"

Glass Size

22" × 26"

How Our Framing Calculator Works

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 Framing Formula

Outer Frame Width = Artwork Width + Left Mat + Right Mat + (Frame Width × 2)
Outer Frame Height = Artwork Height + Top Mat + Bottom Mat + (Frame Width × 2)
Glass Size = Artwork + Mat Borders (fits in frame rabbet)
Miter Length = (Width + Height) ÷ 2 + Frame Width

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.

🖼️ Frame Assembly Diagram

Cross-section showing artwork, mat, glass, and frame layers

Understanding Picture Framing Components

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.

  • Artwork: The actual print, photo, or art piece being framed
  • Mat opening: Cut slightly smaller than artwork to create overlap
  • Mat board: Creates visual space and protects artwork from glass contact
  • Glass/acrylic: Protects artwork from dust, moisture, and handling
  • Frame moulding: The decorative outer border, cut with miter joints
  • Backing board: Seals the frame package from behind

Sources & References

  • Professional Picture Framers Association (PPFA) - Framing Standards and Best PracticesIndustry organization setting professional framing standards
  • Library of Congress - Preservation Guidelines for FramingConservation framing standards for archival materials
  • Artsy Framing Guide - Professional Art Framing TechniquesExpert guidance on selecting and sizing picture frames
  • Fine Woodworking Magazine - Frame Building TechniquesDetailed guides for miter cutting and frame assembly

Framing Calculator Examples

Standard Print Framing Example
Calculate frame dimensions for 16×20" print with professional matting

Project Specifications:

  • Artwork: 16" × 20"
  • Mat Borders: 3" all sides
  • Frame Moulding: 1.5"
  • Mat Layers: Single

Calculation Steps:

  1. Mat outer: 16 + 6 = 22" × 20 + 6 = 26"
  2. Glass size: 22" × 26"
  3. Frame outer: 22 + 3 = 25" × 26 + 3 = 29"
  4. Total moulding: (25 + 29) × 2 = 108"

Result: 25" × 29" outer frame, 22" × 26" glass, 108" moulding needed

Professional proportions with balanced mat borders and standard moulding width.

Small Photo Example

8×10" photo, 2.5" mat, 1" frame

Result: 15" × 17" finished frame

Large Canvas Example

24×36" canvas, no mat, 2" floater

Result: 28" × 40" floater frame

Frequently Asked Questions

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