Brick Course Height Calculator

The course-height formula

One complete masonry course consists of the brick's vertical dimension plus the bed-joint thickness.

The chosen rounding determines whether the final complete course finishes above or below the nominal wall height.

Worked example

For a 3,000 mm wall, 65 mm brick height and 10 mm bed joint:

In this example the dimensions align exactly, so there is no height adjustment from rounding.

What happens when the wall height does not divide evenly?

Suppose a 3,050 mm wall uses the same 75 mm course module. The raw count is 40.67 courses. If complete courses are required, rounding up produces 41 courses and a nominal built height of 3,075 mm, 25 mm above the target.

Joint thickness is part of the module

Changing the mortar joint changes the repeating vertical pitch. A 5 mm difference in joint thickness can accumulate over dozens of courses, so small assumptions can become a visible wall-height difference.

Why the final course needs a drawing check

The calculator can show the arithmetic overshoot or undershoot, but it cannot choose whether the final course should be trimmed, detailed with a different joint, finished under a lintel, or handled with another architectural detail.

Limitations

This tool calculates nominal vertical course geometry only. It does not design masonry, lintels, movement joints, reinforced masonry, openings or structural details.

Frequently Asked Questions

How do you calculate brick courses?

Divide wall height by brick height plus the bed-joint thickness.

Does mortar joint affect course count?

Yes.

Should I round up?

Round up when you need a complete number of courses, then resolve the resulting height in the design.

Can I round down?

Yes for a nominal “not above target” check, but the remaining height must be resolved.

Does this determine finished wall detailing?

No.