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Canvas Stretcher & Gallery Wrap Calculator

Size a canvas for stretcher bars, or check the largest face a cut canvas can cover.

What are you doing?

The finished face of the stretcher frame, the part that stays visible from the front.

Bar depth is the thickness of the stretcher bars, which becomes the visible wrap on each side. Fold-under is how much canvas is pulled around and stapled to the back.

The cut adds the bar depth and fold-under on every side, so a 16 by 20 inch face over 1.5 inch bars with a 2 inch fold-under needs a 23 by 27 inch canvas. For a gallery wrap the image has to run at least the bar depth past the face on each side; the fold-under never shows. The page does not judge whether a bar size suits a canvas or how much extra to add for squaring a stretched edge. Everything is worked out in your browser; nothing is sent or stored.