CMU Block Calculator

Estimate concrete masonry units (CMU), concrete blocks and wall materials with a practical calculator for masons, builders and DIY projects.

Plan a CMU wall by entering its length and height, adding separate wall sections, and subtracting doors and windows. Review estimated block quantities, waste, net wall area, mortar volume, cement bags and sand. Use custom dimensions when your supplier's block sizes differ.

FEATURES
• Estimate CMU blocks for one or more wall sections.
• Add doors and windows to deduct openings from wall area.
• Switch between imperial and metric measurements.
• Choose a CMU preset or enter custom block dimensions.
• Adjust mortar joint thickness, waste percentage and cement-to-sand ratio.
• Estimate wet mortar, 50 kg cement bags and sand quantities.
• Add optional core grout and vertical reinforcement allowances.
• Enter your material and labor rates and currency to estimate costs.
• Save estimates on your device and share a summary.
• Follow the built-in quick guide.

Designed for U.S. projects using feet and inches, with metric support when needed. Verify actual CMU dimensions with your supplier before ordering.

Planning estimates only. Results depend on your measurements and settings. Check quantities against site conditions and construction drawings. Horizontal reinforcement, bond beams, lintels, delivery charges and taxes are excluded. Follow structural plans and local requirements for reinforcement.