Mortar Calculator
Calculate mortar calculator for wall area. Precise material estimations for building contractors and DIY home builders across USA/UK/Canada.
Calculate Mortar Calculator
Enter project dimensions below to compute required material quantities.
Calculation Results
Calculated using verified construction formula: Mortar Bags = Unit Count * Bags Per Unit * (1 + Waste Margin Pct)
Quick Summary
The Mortar Calculator computes total pre-mix 80lb mortar bags, total weight, mixing water gallons, and material cost estimates for both concrete CMU block and clay brick masonry projects.
- Dual Unit Support (Brick & CMU): Calculates mortar quantities for both modular bricks and 8x8x16 concrete blocks.
- Weight & Water Breakdown: Computes total dry mortar weight in tons and gallons of water required.
- Waste Factor: Includes 10% safety margin for trowel droppings and board cleanup.
How to Use the Mortar Calculator
- Enter total Total Masonry Units (Bricks or Blocks).
- Select Masonry Unit Type (Standard CMU Block or Modular Brick).
- Enter Mortar Joint Thickness in inches (3/8 inch standard).
- Adjust the Waste Margin (%) (10% standard).
- Click Calculate to view 80lb mortar bags, dry weight, water gallons, and cost.
Mortar Calculator Formula & Method
This tool utilizes verified construction geometric formulas to compute material requirements:
Brick Mortar Rate: 7.5 bags per 1,000 bricks
Total 80lb Bags = (Unit Count * Mortar Rate) * (1 + Waste Margin / 100)
Where:
- CMU Mortar Yield: 1 bag of 80lb masonry mortar mix lays approx 30 to 35 standard CMU blocks.
- Brick Mortar Yield: 1 bag of 80lb masonry mortar mix lays approx 130 to 140 modular bricks.
- Joint Thickness: Standard 3/8-inch (0.375 in) bed and head joint.
Worked Example
Example: 500 Standard 8x8x16 CMU Blocks (3/8 Mortar Joint) with 10% Waste
- Unit Count: 500 CMU Blocks
- Mortar Rate: 3.0 bags per 100 blocks = 15.0 bags
- Total Bags with 10% Waste: 15.0 * 1.10 = 16.5 bags -> 17 Bags (80 lb)
Applying the formula yields:
Total 80lb Mortar Bags Needed: 17 Bags
Total Dry Mortar Weight: 17 * 80 lbs = 1,360 lbs
Mixing Water Needed: 17 * 1.2 = 20 Gallons
What This Calculator Includes vs. Does Not Include
What This Calculator Includes
- Universal Masonry Mortar Scoping: Measures mortar bags and water requirements for brick, block, stone, and paver projects.
- Dry Weight & Water Multipliers: Computes mixing water gallons and total dry bag tonnage.
What This Calculator Does Not Include
- Concrete Cell Grout Fill: Core filling concrete for hollow block cells.
Tips & Best Practices
- Use Type S Mortar for Below-Grade CMU Footings: Type S mortar provides 1,800 PSI compressive strength required for soil contact foundation walls.
- Keep Mortar Boards Wet: Dampening wooden mortar boards before dropping fresh mortar prevents boards from soaking water out of the mix.
Common Mistakes to Avoid
- Using Dried Mortar Scrapings Off the Ground: Mortar scraped off dirt ground contains soil contaminants that ruin cement adhesion.
Frequently Asked Questions (FAQ)
How many bags of mortar for 500 concrete blocks?
Laying 500 standard 8x8x16 CMU blocks requires approximately 15 bags of 80lb mortar mix (17 bags with 10% waste).
How many bags of mortar for 1,000 bricks?
Laying 1,000 standard modular bricks requires approximately 7.5 bags of 80lb mortar mix (9 bags with 10% waste).
How many concrete blocks will one 80lb bag of mortar lay?
One 80lb bag of pre-mix masonry mortar lays approximately 30 to 35 standard CMU blocks.
What is the weight of one cubic foot of wet mortar?
Wet masonry mortar weighs approximately 130 to 135 lbs per cubic foot.
How much water is needed per 80lb bag of mortar mix?
Add approximately 1.0 to 1.2 gallons of clean water per 80lb bag of pre-mix mortar.
What is the difference between masonry cement and mortar mix?
Masonry cement is raw unmixed powder (requires sand); mortar mix is pre-blended cement + sand (just add water).
How long does a bag of mortar take to dry?
Mortar hardens in 24 hours and achieves full design compressive strength in 28 days.
How much does an 80lb bag of mortar mix cost?
An 80lb bag of pre-mix masonry mortar costs between and .
Is this mortar calculator free to use?
Yes, TibCal's Mortar Calculator is 100% free.