Calculate bricks per square foot from brick size and joint thickness, or estimate bricks needed for a project after subtracting openings.
Related Calculators
- Brick Weight Calculator
- Brick Calculator
- Brick Course Height Calculator
- Brick Circle Calculator
- Wall Area Calculator
- Block Core Fill Calculator
- All Construction Calculators
Bricks Per Square Foot Formula
The calculator uses three formulas depending on the mode you choose.
Brick size mode (find density from a brick’s dimensions):
- L = exposed brick length (in)
- H = exposed brick height or width (in)
- J = mortar joint thickness (in); use 0 only for a zero-joint estimate; dry-laid pavers may require joints
- 144 = square inches per square foot
Project total mode (find total bricks needed):
- A_gross = project length × height (ft²)
- A_openings = doors, windows, or cutouts (ft²)
- D = bricks per square foot
- W = waste allowance (%)
Count and area mode (find density from known counts):
- N = number of bricks installed
- A = area covered (ft²)
The size formula assumes a uniform mortar joint on both length and height edges, which matches how brick “modules” are dimensioned. Check bond patterns, corners, returns, partial bricks and special shapes separately; a waste percentage alone does not determine their quantities. Project totals are rounded up to whole bricks.
Typical Bricks Per Square Foot by Type
These are editable examples, not universal product sizes. Confirm manufacturer dimensions and specified joints. All examples assume a uniform 3/8-inch joint except the paver, which assumes zero joint. Project presets use the rounded densities below; size mode calculates from dimensions without intermediate rounding.
| Brick / paver | Face size (in) | Bricks/ft² | Bricks/m² |
|---|---|---|---|
| Modular | 7.625 × 2.25 | 6.86 | 73.8 |
| Standard | 8 × 2.25 | 6.55 | 70.5 |
| Queen | 7.625 × 2.75 | 5.76 | 62.0 |
| King | 9.625 × 2.625 | 4.80 | 51.7 |
| 4 × 8 paver | 8 × 4 (no joint) | 4.50 | 48.4 |
The percentages below are illustrative allowances, not guarantees. Confirm waste with your supplier based on cuts and breakage. In the calculator, blank openings and waste mean zero.
| Project type | Illustrative waste |
|---|---|
| Straight wall, simple corners | 5% |
| Walls with windows or doors | 7–10% |
| Patios with curves or borders | 10% |
| Herringbone or diagonal patterns | 15%+ |
Worked Example
You’re bricking a 20 ft long, 8 ft tall wall with one 3 ft × 5 ft window, using the rounded modular density preset of 6.86 per square foot, with 10% waste.
- Gross area: 20 × 8 = 160 ft²
- Window: 3 × 5 = 15 ft²
- Net area: 160 − 15 = 145 ft²
- Base bricks: 145 × 6.86 = 994.7
- With waste: 994.7 × 1.10 = 1,094.17 → order 1,095 bricks
FAQ
Why does my count differ from the supplier’s? Suppliers may quote slightly different module sizes or assume different joint thicknesses. The examples use equal 3/8-inch joints in both directions. Specified vertical coursing can require a different bed joint; follow the project specification.
Do I count both sides of a wall? The calculator estimates one face or layer. Count each face or wythe separately, allowing for its dimensions, openings and bond pattern. Double the estimate only when both layers have the same requirements.
Does joint thickness really matter? Yes. Going from 3/8-inch to 1/2-inch joints drops modular brick density from 6.86 to about 6.44 per ft², roughly 6% fewer bricks per area.
