How many concrete blocks do I need?
Based on standard 8 x 8 x 16 inch blocks with 3/8 inch mortar joints.
Blocks to buy
189 blocks
Estimated material cost
Blocks to buy
189 x $$2.50 per block
$473
Mortar mix
7 x $$9.00 per 80 lb bag
$63.00
Typical store prices before tax and delivery. Change any price to match your store.
How to measure
Measure the length and height of the wall. Decide whether every core will be filled with concrete.
Tips from the field
- 1.125 blocks cover one square foot of wall. Includes 5% extra for breakage.
- Check local code for rebar and core fill on retaining or load-bearing walls.
What you'll need
Common questions
How many blocks per square foot?
About 1.125 standard 8 x 8 x 16 inch blocks per square foot of wall.
How much mortar do concrete blocks need?
About one 80 lb bag of mortar mix for every 30 blocks.
Do block walls need rebar?
Load-bearing and retaining walls usually need vertical rebar with filled cores. Check local code.
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Printed from housecalcs.com/tools/concrete-block-calculator