Standard US brick Size & Weight

A standard US modular brick is about 194 x 92 x 57 mm (7 5/8 x 3 5/8 x 2 1/4 in) and weighs roughly 2 kilograms. Add a 10 mm (3/8 in) mortar joint and it works to a nominal 8 x 4 x 2 2/3 inches, which is how bricklayers plan a wall.

This guide covers the exact brick dimensions, the difference between nominal and actual size, the other common US brick types, and how a brick compares to a phone and a loaf of bread.

Quick Answer: How Big Is a Standard US Brick?

A modular brick measures about 194 mm long, 92 mm wide, and 57 mm tall (actual), and 203 x 102 x 68 mm (nominal, including one mortar joint). It weighs 1.8 – 2.3 kg.

Standard Brick Dimensions at a Glance

• Actual size: the physical brick, about 194 x 92 x 57 mm
• Nominal size: actual plus a 10 mm mortar joint, so a modular brick lays up to 8 x 2 2/3 in on a wall
• Three courses of modular brick = 8 in of wall height, which is why brick coursing aligns with 8-inch block
• Weight: roughly 2 kg for a solid clay brick; cored bricks (with holes) are lighter

What Does a Standard Brick Look Like in Size?

A brick is a bit shorter than a 30 cm ruler, about the length of a small loaf of bread, and roughly the footprint of a paperback book with more height. Held in one hand it fills the palm and is heavy enough that a full hod of a dozen bricks weighs about 24 kg.

6 Everyday Comparisons for a Standard Brick

1. A 30 cm ruler (305 mm) is about 111 mm longer than a brick.
2. An iPhone 15 (147.6 mm) is 46 mm shorter than a brick’s length and slimmer.
3. A UK brick (215 x 102.5 x 65 mm) is 21 mm longer, 10 mm wider, and 8 mm taller than a US modular brick.
4. A standard concrete block (390 x 190 x 190 mm nominal) is about twice a brick in every dimension.
5. A loaf of bread (~280 x 130 x 110 mm) is longer and taller.
6. A house key (~55 mm) is about the height of a brick.

Standard Brick Size in Different Units

US Brick Types and Sizes

Larger bricks (queen, king, utility) lay a wall faster with fewer units and less mortar, which is why they are common in commercial work.

Nominal vs Actual: Why It Matters

Bricklayers design walls in nominal dimensions because each brick occupies its own size plus one mortar joint. A modular brick is 194 mm long but takes up 203 mm of wall (8 in) once you add the 10 mm joint. So a wall “4 bricks long” is 4 x 8 in = 32 in, not 4 x 7 5/8 in. Ordering and layout use nominal; cutting and fitting use actual.

Common Mistakes When Comparing Brick Dimensions

1. Using the nominal size as the physical brick. The brick in your hand is about 3/8 in smaller in each direction than its nominal size.
2. Assuming all US bricks are one size. Modular, queen, king, and utility bricks differ significantly.
3. Confusing a US and a UK brick. The UK brick (215 x 102.5 x 65 mm) is noticeably larger.
4. Ignoring cored vs solid. Bricks with holes weigh less and use less clay; a solid brick is heavier.
5. Forgetting the mortar joint in a course count. Three modular courses make 8 inches only with the joints included.

Frequently Asked Questions

What is the standard US brick size?

A modular brick is about 194 x 92 x 57 mm (7 5/8 x 3 5/8 x 2 1/4 in) actual, or 8 x 4 x 2 2/3 in nominal.

How much does a brick weigh?

About 2 kg (4.5 lb) for a solid clay brick.

What is the difference between nominal and actual brick size?

Nominal includes a mortar joint (usually 10 mm); actual is the physical brick without mortar.

How is a US brick different from a UK brick?

A UK brick (215 x 102.5 x 65 mm) is 21 mm longer, 10 mm wider, and 8 mm taller.

How many bricks make 8 inches of wall height?

Three courses of modular brick, with the mortar joints.

What is a queen-size brick?

A larger US brick, about 203 x 79 x 70 mm, that covers more wall per unit.

Final Takeaway

A standard US modular brick is about 194 x 92 x 57 mm and 2 kilograms, laying up to a nominal 8 x 4 x 2 2/3 inches with a mortar joint. Walls are planned in nominal sizes, the brick in your hand is the smaller actual size, and the US modular brick is a bit smaller than a UK brick.