Cabinet and shelf calculators — boxes, drawers and spans

Box sizes and a cut list from the opening, with the slide clearances rounded the way that still fits.

How far a shelf bends under books, how far it can span, and what a strip on the front edge buys you.

A carcass cut list from the finished outside dimensions, face-frame or frameless.

Shelf and rod heights for a single-hang, double-hang or shelf-only closet, with the shelf's sag checked.

Hinge count from door height, and where each one sits down the door.

Whether an overhang needs corbels or brackets, and how many, by material and run length.

Square feet of a straight, L or U countertop with the corner counted once, plus island and backsplash, and how many slabs the pieces come out of.

How many shelves fit a bookcase for the books going on it, even marks for each one, and whether the span will sag.

Table length and width, or diameter, from the seats around it, the room it needs with a walkway, and the seating run for a kitchen island.

Seated and standing desk, chair seat, monitor and workbench heights from your elbow height or your height, with the sources named.

Door sizes from the face frame opening for full overlay, partial overlay or inset, single or pair, and the stile, rail and panel cuts for a five-piece door.

Stiles, rails and mullions to cut for any number of openings across and rows down, pocket-screwed or tenoned, and the opening each one leaves.