Mortar Calculator

How much mortar for brick or block work?

MORTAR BAGS
bags
70 lb bags

Usage Tip

Mix mortar in small batches; it sets in 2-3 hours. Re-temper once with water only.

THE MATH
Bags = (Area ÷ 100) × rate × 1.10
Where: rate = bags per 100 sq ft (one square)
• Includes 10% waste
• Brick 7 / block 4 / fieldstone 5 bags per square
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The calculators and tools on Formula Factory are provided for general guidance and informational purposes only. Results are estimates based on standard formulas and the values you enter — they do not constitute professional engineering, electrical, or architectural advice. Always verify calculations with a qualified professional before making decisions for any safety-critical, code-compliance, or commercial application. Formula Factory makes no representations or warranties as to the accuracy or completeness of any result, and accepts no liability for errors, omissions, or any outcomes arising from reliance on this information.