Mortar Calculator
A mortar calculator estimates how much mortar you need for block or brick by applying a standard usage rate per unit: roughly 3 bags of mortar per 100 standard blocks, or about 1 bag per 30 to 40 bricks. Enter your block or brick count below for an estimated number of mortar bags.
block: ~3 bags per 100; brick: ~1 bag per 30-40; user can refine.
- Units
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Pick block or brick and enter the unit count.
Estimate only. Material yields vary by product and brand; check your product label and add a margin.
How Much Mortar Do You Need for Block or Brick?
Mortar usage follows the unit count. For standard concrete block, plan on about 3 bags of mortar per 100 blocks, so a 300 block wall needs roughly 9 bags. For standard brick, plan on about 1 bag per 30 to 40 bricks, so 1,000 bricks need around 25 to 33 bags. These are working estimates, since joint size and technique change the real figure, so buy a little extra. The calculator estimates bags from your count.
What Affects How Much Mortar You Use?
Mortar usage depends on the unit size, the joint thickness, and your technique (full bedding versus face-shell bedding for block). Thicker joints and full bedding use more mortar, while neat work with face-shell bedding uses less. Because of this range, the calculator gives a standard-practice estimate, and you should add a margin for waste and for filling cores if your design requires it.
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Frequently asked questions
- How much mortar do I need for concrete block?
- Plan on about 3 bags of mortar per 100 standard blocks. A 300 block wall needs roughly 9 bags, plus extra for waste and joint variation.
- How much mortar for brick?
- Plan on about 1 bag of mortar per 30 to 40 standard bricks, so 1,000 bricks need around 25 to 33 bags depending on joint size.