HomeExpertly
www.homeexpertly.com

Cinder Block Calculator

Count concrete blocks (CMU) from real geometry — wall size and openings, block size and core fill — then size the mortar, grout and wall weight, with U.S. pricing and a downloadable PDF.

Block sizes, grout fill and rebar are set by your engineer and local code — follow the plans. Prices use 2024-2025 U.S. figures. For planning purposes only.

Wall & Block
1 Wall Area
ft
×
ft
x
−21 sf
−15 sf
sq ft
Length × height × walls − openings. Edit to enter a known area.
5%
Covers cuts, breakage and culls. 3-5% is typical for block.
2 Block
in
in
in
lb
Nominal sizes include the 3/8 in mortar joint, so 8 x 16 blocks run about 1.13 per sq ft.
3 Fill & Cost
/ bag
About 12-13 blocks per 80 lb bag of premix mortar at a 3/8 in joint.
$
$
Block Estimate
Cinder Blocks Needed
—
Enter your wall to begin
Blocks / sq ft —
Mortar Bags —
Grout Bags —
Materials & Layout
Block size—
Blocks per sq ft—
Courses rows high—
Area with waste—
Mortar bags—
Core fill grout—
TOTAL BLOCKS—
Wall Weight —
Block Weight —
Total Cost —
Blocks By Size
Total blocks for your wall, by block size
Block Size Comparison — Your Wall
Block SizePer sq ftTotal BlocksMortar Bags

For your 109 sq ft wall. Half-high block doubles the count; taller faces cut it.