Mortar Calculator
Calculate the number of mortar bags needed for bricks and concrete blocks masonry projects
1Project Specifications
Modular Bricks
Dimensions: 7⅝" × 2¼" × 3⅝"
Standard modular brick size for residential construction
Recommended: 10% for unexpected needs
2Mortar Bag Details
Common sizes: 50 lbs, 60 lbs, 80 lbs
Bag Weight in Pounds:
80.0 lbs
Optional: For cost estimation
3Mortar Requirements
Enter number of units and select block type to calculate mortar requirements
Bags = Number of Units ÷ Yield per Bag
How to Use the Mortar Calculator
Step-by-Step Instructions
- 1Select your brick or concrete block type
- 2Enter the total number of units for your project
- 3Set waste factor (10% recommended)
- 4Configure mortar bag weight and specifications
- 5Review the calculated bags needed and purchase accordingly
Calculation Formula
Bags = Number of Units ÷ Yield per Bag
Example:
- • 5,000 utility bricks
- • Yield: 24 bricks per 80lb bag
- • Calculation: 5,000 ÷ 24 = 208.3
- • Rounded up: 209 bags needed
Accuracy Tips
- Use manufacturer's yield specifications when available
- Account for site conditions and skill level
- Consider mortar joint thickness variations
- Always round up to ensure adequate supply
Mortar Yield Reference
| Block/Brick Type | Dimensions | Yield Range | Average Yield |
|---|---|---|---|
Modular Bricks Standard modular brick size for residential construction | 7⅝" × 2¼" × 3⅝" | 35 - 42 units | 38 units |
Queen Size Bricks Larger brick size for commercial and institutional buildings | 9⅝" × 2¾" × 2¾" | 28 - 35 units | 31 units |
King Size Bricks Extended length brick for faster installation | 9⅝" × 2¾" × 2¼" | 25 - 30 units | 27 units |
Utility Bricks Double-wide utility brick for structural applications | 11⅝" × 3⅝" × 3⅝" | 23 - 28 units | 24 units |
4 Inch Concrete Blocks Lightweight partition block for non-load bearing walls | 15⅝" × 7⅝" × 3⅝" | 10 - 14 units | 12 units |
6 Inch Concrete Blocks Standard residential basement and foundation block | 15⅝" × 7⅝" × 5⅝" | 8 - 12 units | 10 units |
8 Inch Concrete Blocks Standard load-bearing block for structural walls | 15⅝" × 7⅝" × 7⅝" | 6 - 10 units | 8 units |
10 Inch Concrete Blocks Heavy-duty block for retaining walls and foundations | 15⅝" × 7⅝" × 9⅝" | 5 - 8 units | 6 units |
12 Inch Concrete Blocks Maximum width block for structural and architectural use | 15⅝" × 7⅝" × 11⅝" | 4 - 7 units | 5 units |
Note: Yields are for 80 lb mortar bags under typical conditions. Actual yields may vary based on mortar type, joint thickness, site conditions, and installation methods.
Mortar Types and Applications
Type N Mortar
Above-grade exterior walls, interior load-bearing walls, chimneys
Type S Mortar
Below-grade applications, retaining walls, manholes, sewers
Type M Mortar
Heavy loads, below grade, contact with earth
⚠️ Safety and Professional Considerations
Material Safety
- Always purchase 10% extra for unexpected needs
- Verify mortar type meets structural requirements
- Check manufacturer specifications for yield rates
- Account for weather conditions affecting usage
Installation Quality
- Maintain consistent joint thickness (3/8" typical)
- Use proper mixing ratios for chosen mortar type
- Consider mason skill level for waste calculations
- Plan for appropriate curing time and conditions
Professional Engineering Required: Mortar calculations are critical for structural integrity and building code compliance. This calculator provides material estimates for planning purposes. Always consult with licensed masons, structural engineers, and local building authorities for load-bearing applications and code requirements. Verify all calculations against manufacturer specifications and project requirements.