STILL TOOLS

Professional Picture Framing Calculator

Plan a frame and mat from an artwork, an existing frame opening or a mat opening. Review exact dimensions, overlap, border balance, catalogue matches, tolerances and rejected standards before ordering.

Frame & Mat Specification

A planning reference for artists, photographers and framing professionals. Check every dimension against your own stock and profile before ordering.

InputWhat did you measure?

WidthHeight

MatA mat is the card border around the artwork.Artwork hidden under the matReady-made frame catalogueRounding for a made-to-measure frame

Recommendation: 15.75 × 19.69 in. Ready-made frame

Recommendation

15.75 × 19.69 in

400 × 500 mm · 40 × 50 cm

Ready-made frame · 40 × 50 cm

What this means: The ready-made frame changes the border a little

Narrow, Classic and Wide look for a ready-made frame. Ready-made sizes are fixed, so the border may change. The diagram and result table show what you will get. Choose Exact width to keep the border you enter.

Artwork	12 × 16 in
Frame size (inner / glazing)	15.75 × 19.69 in
Mat opening	11.75 × 15.75 in
What you get at the top	1.97 in
What you get at the bottom	1.97 in
What you get at the sides	2 in
What you chose	2 in
Artwork hidden under the mat	0.13 in
Aspect ratio	3 : 4
Ready-made frame catalogue	Global catalogue

How ready-made frames were checked

Smallest border allowed	1.3 in
Largest border allowed	5 in
Largest allowed difference between top and sides	2.35 in
Difference counted as a changed border	0.01 in
Difference counted as uneven	0.49 in

Reported by the engine for this input. Read-only — the matching rules are fixed.

Ready-made sizes that do not fit

Size	Side border / top border	Verdict
14 × 18 in · 14 × 18 in	+1.13 in / +1.13 in	borders too narrow
12 × 16 in · 12 × 16 in	+0.13 in / +0.13 in	borders too narrow
11.81 × 15.75 in · 30 × 40 cm	+0.03 in / −0 in	smaller than artwork
11 × 14 in · 11 × 14 in	−0.37 in / −0.87 in	smaller than artwork
11.69 × 16.54 in · A3	−0.03 in / +0.39 in	smaller than artwork

Frame size means the inner frame / glazing size, not the outer edge of the moulding.

The mat opening is slightly smaller than the artwork so it holds it in place.

Artwork Size Visualizer ← Picture Frame Size Calculator & Mat Matcher

This reference calculator is provided for information only. Results are estimates based on the measurements and options entered. Always verify dimensions, fit and product specifications with your supplier or manufacturer before ordering. STILL is not responsible for orders or other decisions made in reliance on these results, to the extent permitted by applicable law. See our Terms of Use for details.

How to use the professional calculator

Choose whether you measured the artwork, the inner frame or glazing size, or the visible mat opening. Then select the unit, mat width, overlap, catalogue and rounding method. The recommendation shows the calculated inner frame size together with the mat opening, border dimensions and applicable tolerances.

Understanding the result

Frame size means the inner frame or glazing size, not the outside dimensions of the moulding. Mat opening means the visible cut window. When a mat opening is entered, the artwork size is calculated as the opening plus the selected overlap on every edge. Nearby standards and rejected matches are shown for comparison, not as automatic ordering recommendations.

Before ordering

Ready-made frame dimensions and manufacturing tolerances vary between suppliers. Confirm the inner opening, rebate, glazing, mat opening and required overlap with the framer or manufacturer before placing an order.