Estimate concrete block quantity, CMU/cinder block count, pallet loads, and wall material cost using contractor-grade block wall formulas.
Standard wall — 20×8 ft · 8×16 CMU · 10% waste
This concrete block calculator uses wall area divided by the face area of one block (including mortar joints) to estimate quantity. For standard 8x8x16 CMU, contractors often use about 1.125 blocks per square foot as a quick field check. This page lets you customize block size, mortar joint, waste, and cost so your estimate matches your supplier quote.
Blocks = (Net wall area in sq ft) / (Block face area in sq ft) × (1 + waste%)
Use 10% waste for most simple walls. Increase to 12-15% when you have many corners, openings, bond beam cuts, or multiple block types. Verify structural details with your engineer and local code requirements.
This page is designed as a single estimator for concrete block calculator, cinder block calculator, and CMU block calculator searches so users get one high-quality tool instead of duplicate thin pages.
After block quantity, use our concrete calculator for footing and grout volume and the gravel calculator for compacted base material.