You have finally finished a new collection of paintings and secured a gallery showing. Now you face a pile of consignment agreements and inventory sheets demanding your artwork dimensions.
For many artists, this feels like an afterthought. You quickly jot down the numbers, hand over the spreadsheet, and wait for the show to hang.
But a few days later, the gallery’s website goes live, and every single vertical painting is listed as a horizontal landscape. Your 24-inch tall by 18-inch wide portrait is suddenly being marketed as a short, wide rectangle.
The golden rule of gallery inventory is entirely non-negotiable: Height always precedes Width. If you want to be treated like a professional, you must submit your dimensions using the strict H x W x D industry standard.
1. Overcoming the Graphic Design Habit
If you come from an advertising, graphic design, or photography background, this standard is going to feel entirely backward. Photographers are trained to say “8 by 10” or “5 by 7” regardless of orientation.
Graphic designers are taught to list width before height. The fine art gallery business plays by different rules.
When gallery staff receive a consignment sheet, their database software expects the height first. If you flip those numbers, the gallery associate will blindly enter your data exactly as written.
They won’t pause to ask, “Did she mean this is a vertical piece?” They will simply enter 18 x 24, and your inventory records will be permanently compromised. By conforming to the height-first convention, you remove a major point of friction for the gallery staff.
2. The Rules of Measurement and Precision
Beyond the order of the numbers, there is a distinct gallery preference for how those numbers are formatted. We are running a retail business, not a scientific laboratory.
Here are the core rules for formatting your sizes:
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Stick to inches: If you are selling in the United States, use inches. Metric measurements do not translate cleanly to an American buyer’s spatial awareness.
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Use decimals instead of fractions: Gallery websites and inventory software prefer decimals. List your piece as 24.5 rather than 24 ½.
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Round to the nearest half-inch: Your buyer is not going to refuse a painting because it is listed at 16.5 inches when it is technically 16.375 inches. Keep the math clean.
3. Handling Frames, Depth, and Sculpture
Once you have the basics down, you will inevitably run into corner cases. “What if my frame is massive? What if I paint on a deep panel? What about the base of my sculpture?”
When a collector is evaluating a piece, they are trying to visualize its scale in their living room. You must provide dimensions that best serve that psychological need.
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Framed wall art: Always list the unframed image size. Frames can be swapped or removed, so the canvas size is the true anchor point. If a buyer asks, the gallery will measure the outside frame dimension for them.
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Deep canvas panels: Galleries usually ignore the third dimension (depth) for standard wall art. However, if you paint on a chunky, 2-inch gallery-wrapped panel, include the depth so the collector isn’t surprised by how far it protrudes from the wall.
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Sculpture bases: For three-dimensional work, height remains the most critical metric. Always measure from the bottom of the base to the highest point of the piece to establish the true scale.
One Final Takeaway
Every interaction you have with a gallery is an opportunity to prove you are a seasoned professional. Consistently listing your dimensions as Height x Width x Depth tells a gallery owner that you understand the business.
It shows you respect their systems and want to make their job as effortless as possible. You are proving that you are an artist they can easily partner with.
What Is Your Sizing Standard?
Have you been listing your artwork dimensions backward, or have you naturally followed the height-first rule? Share your experiences with gallery inventory sheets in the comments below.
