Mortar Calculator

Mortar volume depends on the wall area and the thickness of the mortar joints between bricks or blocks.

Imperial formula: Mortar Volume (cu ft) = Wall Area (sq ft) x Joint Coverage Factor

For standard bricks (8" x 2.25") with 3/8" joints, roughly 7 bags (80 lb) of mortar mix covers 100 sq ft of wall.

Metric formula: Mortar Volume (liters) = Wall Area (m²) x Joint Coverage Factor

For standard bricks (215 mm x 65 mm) with 10 mm joints, roughly 0.03 m³ of mortar per m² of wall.

Joint thickness guidelines:

• 3/8 inch (10 mm) — Standard for most brickwork
• 1/2 inch (12 mm) — Common for concrete block walls
• 1/4 inch (6 mm) — Thin joints for precision brickwork

Coverage per 80 lb (36 kg) bag:

• 3/8" joints: approx. 14 sq ft of standard brick wall
• 1/2" joints: approx. 11 sq ft of standard brick wall

Always add 10–15% extra for waste and tooling.