Rectangle Frames

Frame Size Guide

Measure a rectangle frame with confidence

Start with the piece itself. Record width first, then height, and keep the item size separate from the visible opening and finished outside dimensions.

WIDTH → HEIGHT →

The essential rule

Width × height, measured in inches

An 18 × 24 inch frame is 18 inches wide and 24 inches high. Turn the same dimensions sideways and it becomes a 24 × 18 landscape orientation.

Do not round early. Measure to at least the nearest 1/16 inch when possible. We can discuss tolerances and overlap for your specific item.

Three useful measurements

Know which rectangle you are describing

1. Item size

The physical width and height of the art, photo, poster, or mirror. Measure the object itself, not its listed or expected size.

2. Visible opening

The area visible inside a mat or frame lip. It may be slightly smaller than the item so edges are safely held or concealed.

3. Outside frame size

The total wall footprint. It includes the opening, optional mat borders, and frame profile on all sides.

Reference dimensions

Common rectangular sizes

These familiar dimensions are reference points, not limits. Always measure your actual piece before requesting a frame.

4 × 6 inCommon snapshot photograph
5 × 7 inSmall photograph or print
8 × 10 inPortrait or art print
11 × 14 inPhoto and print format
16 × 20 inMedium wall presentation
18 × 24 inCommon poster proportion
24 × 36 inLarge poster format
CustomExact, metric, panoramic, or irregular

Practical measuring steps

Before you submit a request

  1. Place the piece flat and use a rigid ruler or tape in good condition.
  2. Measure width across the top, middle, and bottom; note any variation.
  3. Measure height at the left, center, and right.
  4. Record the smallest dimensions if the piece is uneven, and tell us about the variation.
  5. Note whether the orientation is portrait (taller), landscape (wider), or square.
  6. If wall space is limited, also measure the maximum available outside width and height.

A photograph of the piece beside the measuring tool can help clarify unusual edges or dimensions. Final sizing is discussed before an order is confirmed.

Begin a custom request

Have measurements ready?

Send the item width and height, orientation, and any maximum outside dimensions. If you are uncertain, describe the piece and we’ll identify what else is needed.

Request a custom frame