Calculate brick weight, density, length, width or thickness from the other values with unit conversions for inches, feet, cm, m and tons.
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Brick Weight Formula
The brick weight calculation is based on volume multiplied by density. The calculator converts the length, width, and thickness to inches, density to lb/in³, and weight to pounds before solving the missing value.
- W = brick weight
- L = brick length
- Wd = brick width
- T = brick thickness
- ρ = brick density
If the brick weight is known and one other value is missing, the formula is rearranged:
The calculator can solve for any one missing field as long as the other four fields are filled in. For example, if you leave brick weight blank, it multiplies length, width, thickness, and density. If you leave density blank, it divides the known weight by the brick volume. If you leave a dimension blank, it divides the known weight by the other two dimensions and density.
Common Brick Sizes and Approximate Weights
Actual brick weight varies by material, holes, moisture, and manufacturer. These values are useful for checking whether your result is in a reasonable range.
| Brick Type | Typical Size | Approximate Weight |
|---|---|---|
| Standard modular brick | 7.625 in × 3.625 in × 2.25 in | 4 to 5 lb |
| Engineering brick | About 8 in × 4 in × 2.25 in | 5 to 6.5 lb |
| Concrete brick | About 8 in × 4 in × 2.25 in | 5 to 7 lb |
| Fire brick | 9 in × 4.5 in × 2.5 in | 7 to 9 lb |
Typical Brick Density Values
| Material | Typical Density | Equivalent Approximation |
|---|---|---|
| Clay brick | 110 to 130 lb/ft³ | 0.064 to 0.075 lb/in³ |
| Concrete brick | 120 to 150 lb/ft³ | 0.069 to 0.087 lb/in³ |
| Fire brick | 130 to 150 lb/ft³ | 0.075 to 0.087 lb/in³ |
Brick Weight Examples
Example 1: Find the weight of a brick
Suppose a brick is 8 in long, 4 in wide, and 2.25 in thick. Its density is 120 lb/ft³.
First convert density to lb/in³:
Then multiply volume by density:
The brick weighs about 5.00 lb.
Example 2: Find density from brick weight
Suppose a brick measures 7.625 in × 3.625 in × 2.25 in and weighs 4.5 lb.
The density is about 0.07236 lb/in³, which is approximately 125 lb/ft³.
Brick Weight Calculator FAQ
Why does brick density matter?
Density tells you how much material weight is packed into a given volume. Two bricks with the same dimensions can have different weights if one is made from denser clay, concrete, or refractory material. Hollow or cored bricks also weigh less than solid bricks of the same outside size.
Should mortar be included in brick weight?
This calculator finds the weight of the brick itself, not the weight of a finished wall. If you are estimating the load of masonry, include mortar separately. Mortar can add a meaningful amount of weight, especially across a large wall area.
Why is my calculated brick weight different from the supplier’s listed weight?
Supplier weights often account for the actual manufactured shape, cores, recesses, material mix, and moisture content. A simple volume times density calculation treats the brick as a solid rectangular block unless you adjust the density or dimensions to reflect the actual brick.
