Slab Wall Ruler — Measure & Cut Clay Walls for Handbuilding

Handbuilding just got easier. The Slab Wall Ruler is a simple, all-in-one cylinder measuring tool designed to help potters size and cut clay walls quickly and consistently. Whether you’re making tall narrow cups, short wide bowls, mugs, or lidded forms, this tool takes out the guesswork. No more trimming oversized slabs after wrapping, and no more making or buying stacks of straight-sided cylinder templates — just measure, cut, and build walls that fit every time.

Choose Your Size

• Mini — Measures walls for pieces as small as 1" wide x 1" tall and up to 4" wide x 5" tall. Perfect for espresso cups, ramekins, shot glasses, mugs, cups, and bud vases. Includes a scoring tool and clay compass for bases up to 4”.

• Standard — Handles larger work, measuring walls for pieces up to 6" wide x 6" tall. Perfect for bowls, pet dishes, small vases, lidded jars, and planters. Includes a scoring tool and clay compass for bases up to 6”.

Base Size

Base sizes are laid out in ½-inch increments. Each guide line shows where to trim so your slab forms a cylinder that fits neatly on top of that base size.

Wall Height

Use the height markers when you want precision, or just use them as a reference. You can trim the wall width and base edge, then freeform the rim for wavy, carved, or organic tops.

Built for Handbuilding

Designed for ¼” slabs with the wall sitting on top of the base, the Slab Wall Ruler is durable, studio-ready, and built for daily use. Whether you’re just learning the basics of slab building or you’re an experienced handbuilder aiming for consistency, this ruler is a new studio essential. With the Slab Wall Ruler, you’ll measure, cut, and assemble clay walls that fit together just right — every single time.