Picture Frame Calculator

Written by Great Medico

Updated September 25, 2026 •2 min read

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The Picture Frame Calculator turns a common planning or conversion task into a transparent result. Its job is to estimate finished outer frame dimensions and moulding length from artwork, mat, and frame widths. Because the Picture Frame Calculator uses a compact rule, realistic values and careful unit/date checks matter more than extra decimal precision.

What this calculator does

The primary result is “Outer frame size” and is displayed in in. Supporting values on the page include Moulding length, Artwork. In practical terms, the Picture Frame Calculator is meant to estimate finished outer frame dimensions and moulding length from artwork, mat, and frame widths. The Picture Frame Calculator does not infer or add inputs that are absent from its visible form.

How to use it

Enter Artwork width, Artwork height, Mat width and Frame moulding width. For the Picture Frame Calculator, check the selected unit beside every measured quantity. When comparing Picture Frame Calculator scenarios, change one field at a time so the source of the difference stays obvious.

How the calculation works

For the Picture Frame Calculator, artwork size is expanded by the mat and moulding on both sides: outer width = artwork width + 2×(mat + frame), and outer height uses the same rule. Approximate moulding length is the perimeter 2×(outer width + outer height).

Example

For 16 × 20 inch artwork, a 2-inch mat, and 1.5-inch moulding, each side gains 3.5 inches twice. The finished footprint is therefore 23 × 27 inches, and the estimated moulding perimeter is 100 inches.

How to interpret the result

Read the outer width × height as the approximate finished footprint on the wall. The moulding-length metric is a perimeter estimate; order extra material when cutting waste, miters, defects, or matching patterns matter.

Limitations and notes

For the Picture Frame Calculator, the geometry assumes uniform mat and moulding widths on every side. Rabbet depth, overlap, frame joins, glazing, backing, mounting method, mat reveal, and cutting waste are not included.