Project Inputs
Large screens: 3 columns. Smaller screens: 2 columns. Mobile: 1 column.Formula Used
1) Gross wall area
Gross wall area = wall length × wall height
2) Net wall area
Net wall area = gross wall area − total openings area
3) Net wall volume
Net wall volume = net wall area × wall thickness
4) Nominal unit volume
Nominal unit volume = (unit length + vertical joint) × (unit height + horizontal joint) × unit width
5) Number of units
Units = net wall volume ÷ nominal unit volume
6) Wet mortar volume
Wet mortar = net wall volume − (units × actual unit volume)
7) Dry mortar volume
Dry mortar = wet mortar × (1 + wastage%) × dry factor
8) Material split
Cement volume = dry mortar × cement part ÷ total parts
Sand volume = dry mortar × sand part ÷ total parts
9) Cement bags and water
Cement mass = cement volume × cement density
Water estimate = cement mass × water-cement ratio
How to Use This Calculator
- Enter wall dimensions and choose the correct length unit.
- Add total area of doors, windows, or other openings.
- Enter brick or block dimensions plus horizontal and vertical joint thickness.
- Set the mortar mix ratio, dry factor, wastage, and water-cement ratio.
- Enter cement density and bag weight to estimate procurement quantities.
- Press the calculate button to show the result block above the form.
- Use the CSV button for spreadsheet export and the PDF button for report output.
Example Data Table
This worked example is generated using the same formula logic as the calculator.
| Parameter | Example Value | Calculated Output |
|---|---|---|
| Wall dimensions | 5 m × 3 m × 0.23 m | Gross area: 15.00 m² |
| Openings deduction | 1.50 m² | Net area: 13.50 m² |
| Brick dimensions | 190 × 90 × 90 mm | Units exact: 1,725.00 |
| Joint thickness | 10 mm horizontal, 10 mm vertical | Wet mortar: 0.495 m³ |
| Mix ratio | 1 : 6 | Dry mortar: 0.659 m³ |
| Wastage and dry factor | 10% wastage, 1.33 dry factor | Cement bags: 3 |
| Water-cement ratio | 0.50 | Water: 67.75 L |
| Sand requirement | Computed from material split | Sand: 0.565 m³ |
FAQs
These answers stay brief and use plain HTML only.
1) What does this mortar quantity calculator estimate?
It estimates net wall volume, masonry unit count, wet mortar, dry mortar, cement volume, sand volume, cement bags, and approximate water demand. It is suited for brick and block masonry planning.
2) Why is a dry volume factor included?
Dry ingredients occupy more volume than finished wet mortar because of bulking, voids, and site losses. The dry factor converts wet mortar demand into a more practical batching quantity for cement and sand.
3) Should I subtract doors and windows?
Yes. Deducting openings improves accuracy because those areas do not require masonry units or mortar. Enter the combined opening area so the calculator works with the true net wall surface.
4) What joint thickness should I enter?
Use the actual site or design joint thickness for bed joints and head joints. Ten millimeters is common, but engineered masonry may specify different values depending on unit type and workmanship standards.
5) Can this tool be used for both bricks and blocks?
Yes. Enter the correct unit dimensions and joint thicknesses for the material you are using. The method is geometry-based, so it works for many rectangular bricks and concrete blocks.
6) Why is the rounded unit count higher than the exact count?
The exact count is mathematical. Procurement usually needs whole pieces, so the rounded value helps purchasing. Site breakage, cutting, and handling losses may justify ordering slightly above the rounded figure.
7) Is the water result exact for site mixing?
No. It is a planning estimate based on the selected water-cement ratio. Actual water demand changes with sand moisture, cement type, workability needs, weather, and mixing method.
8) How can I improve result accuracy further?
Use field-measured wall dimensions, actual opening deductions, real unit sizes, specified joint thicknesses, project mix ratios, and a realistic wastage allowance. Align your inputs with drawings, specifications, and site practices.