Cinder Block Calculator
Planning factor ~1.125 blocks per square foot of wall face.
Step 1: Units
Step 2
Enter project measurements
Use decimals if needed (e.g. 3.5).
Step 3
How to use this calculator
Net wall area.
What the math is doing
Blocks ≈ ceil(sf × 1.125 × (1+waste)).
Frequently asked questions
Lightweight aggregate?
Block size still drives count.
Rebar cells?
Grout volume separate.
Lintels?
Add special units.
Waterproofing?
Not included.