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Mortar Sand Calculator

Calculate sand and cement quantities for ASTM standard mortar types: Type M (High Strength), Type S (Structural), Type N (General), and Type O (Interior).

Mortar Batch Mix

Real-Time
Sand Volume
0.00 yd³
0 CFT
Cement Bags (94 lb / 50 kg)
0 Bags
0 lbs
Sand Weight
0.00 tons
Masonry sand
Dry Volume Total
0.00 CFT
Compacted dry mix
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ASTM C270 Mortar Specifications

Proportions for Type M (2500 psi), Type S (1800 psi), Type N (750 psi), and Type O (350 psi).

TYPE M 2,500 psi TYPE S 1,800 psi TYPE N 750 psi TYPE O 350 psi ASTM BATCHING • Type M: 1 Cement : 0.25 Lime : 3 Sand • Type S: 1 Cement : 0.5 Lime : 4.5 Sand • Type N: 1 Cement : 1 Lime : 6 Sand • Aggregate ratio: 2.25–3.0 × Binders

ASTM C270 Mortar Specifications

Proportions for Type M (2500 psi), Type S (1800 psi), Type N (750 psi), and Type O (350 psi).

Mathematical Theory

Engineering Calculations & Formulas

Mathematical formulas and engineering constants powering this calculator.

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ASTM Sand Proportioning

Sand volume must be between 2.25 and 3.0 times total cementitious volume.

Sand Volume = 2.25 to 3.0 × (Vol Cement + Vol Lime)
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Compressive Strength Rating

Standard 28-day curing strength according to ASTM C270 standards.

Type M = 2500 psi  |  Type S = 1800 psi
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Batch Weight Proportions

Converts volumetric ASTM mortar parts to site batch weight in kg/lbs.

Sand Mass = Mortar Dry Vol × (Sand Ratio / Sum) × 1600 kg/m³

ASTM C270 Mortar Types Explained

  • Type M (2,500 psi): High compressive strength for retaining walls, foundations, and heavy load-bearing structures.
  • Type S (1,800 psi): High tensile bond strength for exterior walls at or below grade.
  • Type N (750 psi): Standard medium strength for residential exterior chimneys and walls.
  • Type O (350 psi): Low compressive strength for non-load-bearing interior walls.

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