Concrete Block Calculator

Calculate the total number of concrete or cinder blocks needed for wall construction including waste allowance.

Wall Length (ft) 30 ft

15 ft 30 ft 50 ft 100 ft

Wall Height (ft) 8 ft

6 ft 8 ft 10 ft 12 ft

Standard Block Size (L x H)

Blocks Required

270 Blocks

Includes 5% Waste: 284 Blocks

Wall Area

240 sq ft

Est. Mortar Bags

~ 9 Bags (80 lb)

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Frequently Asked Questions

Understanding concrete block wall estimation.

A standard 8x8x16 cinder block (with a 3/8" mortar joint) covers 1.125 square feet of wall face. Therefore, you need 1.125 blocks per square foot (or 9 blocks per 8 square feet).

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