# Picture Frame Calculator

Calculate picture frame dimensions including mat opening, glass size, and total outer dimensions. Plan your custom framing project with exact measurements.

## What this calculates

Planning to frame artwork, photos, or prints? Enter your art dimensions and preferred mat and frame widths to calculate the exact outer frame dimensions, mat opening, glass size, and visible mat area. Perfect for custom framing orders or DIY projects.

## Inputs

- **Art Width** (inches) — min 1, max 72 — Width of the artwork or photo.
- **Art Height** (inches) — min 1, max 72 — Height of the artwork or photo.
- **Mat Border Width** (inches) — min 0, max 6 — Width of the mat border around the art. 0 for no mat.
- **Frame Molding Width** (inches) — min 0.5, max 6 — Width of the frame molding itself.

## Outputs

- **Frame Outer Dimensions** — formatted as text — Overall size of the frame on the wall.
- **Mat Opening** — formatted as text — Size of the mat window (slightly smaller than art).
- **Glass / Backing Size** — formatted as text — Size of the glass and backing board needed.
- **Visible Mat Area** (sq in) — Total visible mat surface area.

## Details

Custom framing involves several measurements that must work together:

  - Mat opening: Slightly smaller than the art (1/4 inch overlap on each side) to hold it in place

  - Glass/backing: Art dimensions plus mat border on all four sides

  - Frame outer: Glass dimensions plus frame molding width on all four sides

The mat serves both an aesthetic and protective purpose. It creates visual breathing room between the art and the frame, and it keeps the glass from directly touching the artwork, which can cause moisture damage over time. A 2-inch mat is standard for most prints, while larger artwork or gallery-style presentations often use 3-4 inch mats.

When selecting frame molding, consider the visual weight in proportion to the art size. Small prints (under 11x14) look best with narrow frames (0.75-1.5 inches). Medium prints (11x14 to 20x24) work well with 1-2 inch frames. Large pieces (over 20x24) can handle wider frames of 2-3 inches or more.

## Frequently Asked Questions

**Q: What is the standard mat width?**

A: The most common mat width is 2 inches. For a more gallery-style look, use 2.5-3 inches. Small frames (5x7, 8x10) look good with 1.5-2 inch mats. Large pieces can handle 3-4 inch mats. The bottom mat border is sometimes made 0.5 inches wider than the sides and top (weighted bottom) for a more balanced visual appearance.

**Q: Why is the mat opening smaller than my art?**

A: The mat overlaps the edges of the artwork by about 1/4 inch on each side. This overlap holds the art in place and hides any uneven edges. The visible area of your art will be 1/2 inch smaller in each dimension than its actual size.

**Q: Do I need a mat?**

A: Mats are recommended for any artwork on paper (prints, watercolors, photos). They prevent glass from touching the art, which causes condensation damage. Canvas paintings mounted on stretcher bars do not need mats or glass. Mats also enhance the visual presentation significantly.

**Q: What type of glass should I use?**

A: Regular glass works for most framing. Museum glass (anti-reflective, UV-filtering) is ideal for valuable or light-sensitive pieces but costs significantly more. Acrylic (plexiglass) is lighter and shatter-resistant, making it better for large frames, children's rooms, or frames shipped long distances.

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Source: https://vastcalc.com/calculators/everyday/picture-frame
Category: Everyday Life
Last updated: 2026-04-21