Brick & Block Calculator
Estimate how many bricks or blocks a wall needs from its area and the unit size, allowing for the mortar joint and waste, plus the bags of mortar. Calculates in your browser.
Units to buy
-
Show the math
Each unit occupies its face plus the mortar joint:
unit area = (width + joint) × (height + joint) ÷ 144
units = wall area × (1 + waste%) ÷ unit area
A standard modular brick with a 3/8-inch joint works out to about 6.5–7 per square foot. Roughly 7 bags of mortar per 1,000 bricks is typical. All math runs locally in your browser.
What this does
A brick & block calculator estimates how many units a wall needs from its area and the unit size, allowing for the mortar joint and waste, plus bags of mortar.
How to use it
- Enter the wall area.
- Enter the unit size and joint.
- Add a waste allowance.
- Read the units and mortar bags.
How it works
Each unit occupies its own size plus the mortar joint. A standard brick works out to about 7 per square foot of wall face.
units = wall area ÷ (unit + joint) area
Understanding your result
The count already allows for the mortar joint and a waste margin, but order another 5 to 10 percent for breakage, cuts, and the inevitable rejects, since running short mid-wall means a second delivery and a colour you may not match. Use the mortar estimate as a starting point, as joint size and mixing practice shift consumption noticeably.
Example
A 100 sq ft wall in standard brick needs roughly 700 bricks.
Sources & methodology
Last updated .
Frequently asked questions
How many bricks are in a square foot?
A standard modular brick with a 3/8-inch joint works out to about 6.5–7 per square foot of wall face. The tool computes it from your unit size and joint.
Why include the mortar joint?
Each unit effectively occupies its own size plus the joint, so adding the joint to width and height gives an accurate count.
How much mortar will I need?
Roughly 7 bags per 1,000 standard bricks is a common rule; enter your own figure to match the unit and joint.
Is anything stored?
No. Everything is calculated locally in your browser.
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