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Woodworking Math

Rabbet joint

A rabbet is a step cut along the edge or end of a board: an open-sided recess, in Fine Woodworking’s words, that lets another board sit into it. Rabbets join case corners and backs, hold glass and panels in frames, and form one half of many other joints, from tongue and groove to half-blind dovetails.

How deep

A rabbet is traditionally no deeper than two thirds of the stock: 1/2 in in 3/4 in stock.

The depth is usually set from the thickness of the board being cut, so enough wood is left behind the step. For 3/4 in stock that means no deeper than 1/2 in. The width usually matches the thickness of the piece that sits in it.

Traditional rule, stated by Fine Woodworking (Taunton Press) and Woodcraft

Why it beats a butt joint

The USDA Wood Handbook says a plain end-grain butt joint cannot be glued strong enough for ordinary service, and that where end grain meets edge grain the joint needs interlocking parts, so that edge grain is glued to edge grain. It names dowels, mortise and tenons and rabbets as examples of strong joints of that kind.

One source: USDA Forest Products Laboratory, the authority for wood adhesive joints it tested

How it’s cut

Woodcraft calls a hand-held router the most common way to cut rabbets, with a piloted rabbeting bit whose bearing sets the width. On the table saw, a dado stack buried in a sacrificial fence cuts a rabbet in one pass, or two cuts at right angles with an ordinary blade remove the waste. By hand, a rabbet plane or a shoulder plane does the job.

Related joints

Sources

  1. Fine Woodworking (Taunton Press), Mario Rodriguez, "All About Rabbet and Dado Joints" (2005), read 2026-11-07
  2. Woodcraft, Craig Bentzley, "Joinery Made Simple: Rabbets, Dadoes, and Grooves", read 2026-11-07
  3. USDA Forest Products Laboratory, Wood Handbook (FPL-GTR-282, 2021), ch. 10 "Wood Adhesives", End-Grain and End-to-Edge-Grain Joints, read 2026-11-07

Proportions marked as a traditional rule are shop tradition, not measurements. This site gives no joint-strength numbers: the published tests each used a different rig. How we source these numbers.