How many blocks do you need for a masonry wall?

Masonry
Estimating & Takeoff
Material Tracking

A block order is coursing arithmetic: wall length and height divided by the laid unit plus a 3/8 bed and head joint. Measuring the actual CMU on the pallet with the T1R Range and feeding it to the wall calculator counts against the block you are laying rather than a nominal 8 by 16. That is the difference between a spare cube on site and sending someone back to the yard halfway up the last course.

How the block count is worked out

Measure the actual CMU on the pallet
T1R feeds length and height to the calculator
Counts on the laid unit plus bed and head joint
Not a nominal 8 by 16 assumption
No trip back to the yard on the last course

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Block count comes from the real unit size, not the nominal one. Measure the block on the pallet, put the length and height into the wall calculator with your wall dimensions, and the count comes back including the coursing. Guessing at nominal sizes is how you end up a partial cube short on the last course.