Masonry Mortar Weight and Bag Calculator
Estimate dry masonry mortar and whole bags from wall area, product consumption and site allowance.
Formula
Planning estimate. Check product specifications and local requirements before purchasing.
Worked example: Masonry Mortar Calculator
Measurements in this example
| Length | 8 m |
|---|---|
| Height | 2.7 m |
| Product consumption | 25 kg/m² |
| Bag weight | 25 kg |
| Waste allowance | 8 % |
Calculated quantities
| Area | 21.6 m² |
|---|---|
| Dry material | 583.2 kg |
| Bags | 24 |
What to check
This calculation uses: Length, Height, Product consumption, Bag weight, Waste allowance. It returns: Area, Dry material, Bags.
Measure masonry by the face that receives mortar and separate walls when unit size, joint or mortar type changes.
Wall area is multiplied by the editable dry-mix consumption and allowance, then divided by bag weight.
Use the manufacturer yield for the chosen blocks and joint thickness. Dense units and deep joints can change consumption substantially.
Weather, suction, mixing water and workable time affect site losses. Do not add water to recover mortar beyond its permitted life.
Use the units beside each field. The values in the worked example are starting inputs; replace them with your measurements and the specifications of your material.
Compare alternatives
Open a tool, enter your measured dimensions, then save an estimate. Keep another version if you want to compare products or allowances.