1 Your measurements

Type feet and inches the way you'd write them, like 12' 6" or 30 3/8. Decimals work too.

ft
ft
sq ft
Total area to leave out.
%
CMHA estimates use 5% for breakage and cuts.
$

2 What to buy

Blocks
189
8 × 8 × 16 in, with extra
Mortar
15 bags
80 lb, about 13 blocks per bag
Wall area (less openings)160 sq ft
Blocks before extra180
Full courses × blocks per courseabout 6 × 30, before openings
Mortar15 bags of QUIKRETE Mortar Mix (Type N) or Mason Mix (Type S), 80 lb

Block walls that hold back soil or carry a load need steel reinforcing bars in grouted cells and a proper footing. The building code and your local building department set the spacing, so get a permit before you build one.

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