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Standard Unit Block Shapes – Wooden Block Shapes and Sizes.

These are based upon the Standard Unit Block invented by Caroline Pratt 100 years ago and used widely as a play-based educational material. Dimensions are given in inches.

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definitions with size, shape, and dimensions of standard unit blocks.

Click on the name of the wooden block shape to search for that shape of unit block.

Wooden blocks measuring 5.5 x 2.75 x 1.375 inches. The base wooden block size. All other standard unit blocks are fractions or multiple of the basic unit. Another term for standard units.

Wooden blocks measuring 5.5 x 2.75 x 1.375 inches. This is the basic unit with its 4:2:1 ratio upon which all other shapes are based. Educator Caroline Pratt extended Froebel's Fourth Gift using a slightly larger wooden block made from hard maple.

Wooden blocks measuring 2.75 x 2.75 x 1.375 inches. These square blocks are half the length of the basic standard unit block but the same width and depth. In cheaper sets, half units may be substituted for standard unit, or even called standard units, to increase the advertised block count and reduce shipping weight. Compare with Melissa & Doug 60 Standard Unit Blocks.

Wooden blocks measuring 11 x 2.75 x 1.375 inches. These blocks are twice as long as the standard unit block. In cheaper sets, there may be only two or less of these to increase the block count and reduce shipping weight.

Wooden blocks measuring 22 x 2.75 x 1.375 inches. These blcoks are four times as long as standard units. Almost nonexistent in economy unit block sets. Compare with Melissa & Doug 60 Standard Unit Blocks.

Wooden blocks measuring 5.5 x 2.75 x 1.375 inches. The same dimensions as the standard unit except one 2.75 edge is cut off to make the 5.5 x 1.375 inch sides triangular.

Wooden blocks measuring 5.5 x 2.75 x 1.375 inches. The same dimensions as the standard unit except one 1.375 edge is cut off to make the 5.5 x 2.75 inch sides triangular.

Wooden blocks measuring 2.75 x 2.75 x 1.375 inches. The same dimensions as the half unit except one 1.375 edge is cut off to make the 2.75 x 2.75 inch sides triangular.

Wooden blocks measuring 5.5 x 2.75 x 1.375 inches. The same dimensions as the standard unit except for a 2.75 inch diameter semicircle cut out of the middle of the one 5.5 inch edge.

Wooden blocks measuring 5.5 x 2.75 x 1.375 inches. The same dimensions as the standard unit except for a 1.375 inch radius quarter circle and half pillar removed from the one 5.5 inch edge creating an "L" shaped block. Two of these may be use together to create a Roman Arch.

Wooden blocks measuring 2.75 x 2.75 x 1.375 inches. These blocks are the same dimensions as half units except one corner is removed to create a quarter circle shape on the 2.75 by 2.75 inch side.

Wooden blocks measuring 11 x 8.25 x 1.375 inches. These blocks add a half unit to one end of a 8.25 inch radius quarter cicle arch. A standard unit can fit under the half unit and a 2.75 inch radius quarter circle and 5.5 inch radius quarter circle arch can fit under the curved portion of an elliptical curve.

Wooden blocks measuring 22 x 2.75 x 0.6875 inches. These blocks are ideally half thickness quadruple units used for roads, roofs, floors, tables and bridges.

Wooden blocks measuring 11 x 2.75 x 0.6875 inches. These blocks are ideally half thickness double units used for roads, roofs, floors, tables and bridges.

Wooden blocks measuring 5.5 or 11 or 22 x 2.75 x 0.6875 inches. Half-thickness standard units, double units, or quadruple units used to make roads. May include intersections