Mortar Calculator
Use this mortar calculator to estimate how many bags you need for a brick or block project. Enter the number of bricks or blocks, the bag yield, and an allowance for waste so you can order the right amount before the wall goes up. It is a simple way to avoid running short midway through the job.
Result
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What This Mortar Calculator Helps You Do
Use this mortar calculator to estimate how many bags you need for a brick or block project. Enter the number of bricks or blocks, the bag yield, and an allowance for waste so you can order the right amount before the wall goes up. It is a simple way to avoid running short midway through the job.
How to Calculate Mortar Calculator
- Choose brick or block mode - Pick the mode that matches your wall project.
- Enter the quantity - Type in how many bricks or blocks you need for the wall.
- Set the yield - Enter the number of bricks or blocks a single mortar bag can cover.
- Add waste and cost - Include an allowance if you want a safer order quantity and add price if you want to estimate the total spend.
Mortar Calculator Formula
| Symbol | Definition | Unit |
|---|---|---|
| N | Number of bricks or blocks | units |
| Y | Yield per bag | units/bag |
| w | Waste allowance | % |
| P | Price per bag | $ |
Worked Examples
- bricks: 5000
- yieldPerBag: 24
- waste: 10
Result: Mortar bags = 230.00 bags
Rounding up helps avoid running short on a brick wall project. The estimate is 230.00 bags.
- blocks: 900
- yieldPerBag: 15
- waste: 8
Result: Mortar bags = 65.00 bags
Block yield is lower, so the bag count can change quickly with the wall size. The estimate is 65.00 bags.
- bricks: 4200
- yieldPerBag: 25
- waste: 12
- pricePerBag: 10.25
Result: Mortar cost = 1937.25 $
Cost estimation is useful when the supplier sells mortar by the bag instead of by weight. The estimate is 1937.25 $.
- blocks: 1200
- yieldPerBag: 14
- waste: 10
- pricePerBag: 11
Result: Mortar cost = 1045.00 $
A cost check keeps the masonry budget under control before the first course is laid. The estimate is 1045.00 $.
How to Interpret Your Results
| Range | Meaning | Action |
|---|---|---|
| < 10 bags | Small patch | Often enough for a repair or a short wall section. |
| 10–50 bags | Small wall | Typical for a garden wall or a modest masonry job. |
| 50–200 bags | Medium wall | Plan delivery and storage so the site stays organized. |
| > 200 bags | Large masonry job | Coordinate supply, staging, and waste control before work starts. |
Frequently Asked Questions
Sources
Last reviewed: March 2026