I am fitting my pantry with custom drawers, and I am worrying a bit about the weight capacity of one drawer in particular. The drawers are 14" wide and 21" deep. I've constructed them with the front/back and sides made with 1/2" baltic birch plywood - plus a prettier drawer front, but that's not really relevant. The bottom is 1/4" birch veneer plywood, dadoed and glued in on all four sides. The boxes were assembled with pocket screws to join the front/back to side pieces, and supported with full length side-mount drawer slides.
I think this should be able to handle most pantry storage needs for this size of drawer ... but the drawer I'm worrying about is the bottom one that will hold lots of bottles. According to the online Sagulator, a shelf of those dimensions made of "fir plywood" should be able to handle 50 pounds of uniformly-distributed weight no problem (and that's not accounting for the dado support on the front of the drawer) - with 'fixed ends'. With 'free ends' not so much.
It's sort of hard ... I find all kinds of guidance about what is "normal" or "light duty" versus "heavy duty" for drawer construction, but no quantitative indication of how much weight that really means, even approximately.
Is the Sagulator a reasonable way to figure out drawer weight capacity? Does a glued dado count as 'fixed ends'?. (The dadoes are not super snug, unfortunately ... not super loose but not as snug as I would have preferred). For me specifically, would this drawer construction (and size) support a drawer-full of bottles, I'm estimating maybe 30 pounds or so?
p.s. the 1/4" plywood has a description of "White or Yellow Birch Grade B2 (or equivalent) with a veneer core CARB Phase 2 compliant" for the inner plys, if that matters.