Inputs
Example Data (Sample Scenario)
| Input | Example Value | Notes |
|---|---|---|
| Wall (L × H × Thickness) | 10 m × 3 m × 230 mm | Common boundary wall section. |
| Openings | 2.0 m² | Doors and windows deducted from area. |
| Brick size + joint | 190×90×90 mm, joint 10 mm | Adjust to local brick standards. |
| Mortar mix | 1 : 6 | Cement : sand by volume. |
| Rates | Brick 22, Cement bag 1350, Sand 3500 | Use your currency; values shown are examples. |
| Labor rate | 750 per m² | Includes laying and finishing labor. |
| Markups | Overhead 10%, Profit 10%, Contingency 5% | Typical field estimating allowances. |
Formula Used
- Gross area: Agross = L × H
- Net area: Anet = max(0, Agross − Aopenings)
- Wall volume: Vwall = Anet × t
- Brick volume with mortar: Vunit = (Lb+j) × (Wb+j) × (Hb+j)
- Net bricks: N = Vwall / Vunit
- Bricks with waste: Nw = N × (1 + w%)
- Mortar wet volume: Vm,wet = max(0, Vwall − N × Vbrick) × (1 + m%)
- Mortar dry volume: Vm,dry = Vm,wet × k
- Mix split: Cement = Vm,dry × (c/(c+s)), Sand = Vm,dry × (s/(c+s))
- Cement bags: Bags = Cement / Vbag
- Labor: Costlabor = Anet × Rate
- Totals: Apply transport %, overhead %, profit %, contingency %, then tax/VAT %.
How to Use This Calculator
- Select your unit system. Enter wall length and height accordingly.
- Enter wall thickness in millimeters and total opening area.
- Confirm brick size and mortar joint to match site practice.
- Set mortar mix ratio, dry volume factor, and bag volume if needed.
- Fill in brick, cement, sand, labor, and optional water rates.
- Add transport, overhead, profit, contingency, and tax percentages.
- Click Calculate to view results above the form.
- Use Download CSV or Download PDF for reporting.
Field Inputs That Drive Brickwork Cost Accuracy
Brickwork estimating improves when site measurements and rate sources match real procurement conditions. This calculator treats wall geometry, opening deductions, thickness, brick size, and joint width as the primary quantity drivers. Small changes in joint width or brick dimensions can meaningfully change brick count, mortar demand, and therefore total cost.
Quantity Breakdown From Area to Materials
Net wall area is computed after subtracting door and window openings, then multiplied by thickness to obtain wall volume. Bricks are derived from “brick-plus-joint” unit volume, while mortar is estimated as the remaining volume after subtracting the solid brick volume. Waste factors are applied separately to bricks and mortar so field losses are not hidden inside one generic percentage.
Mortar Mix, Dry Factor, and Cement Bags
Mortar converts from wet volume to dry volume using a dry factor, then splits into cement and sand by the selected mix ratio (for example 1:6). Cement is converted to bags using a bag-volume assumption, allowing procurement planning and comparison between vendors. If you prefer purchase rounding, enable bag rounding.
Cost Structure for Tender, Site Billing, and Control
Materials are priced from unit rates (per brick, per bag, per cubic meter). Labor is computed from net area and a chosen rate basis. Transport, access, tools, overheads, profit, contingency, and tax are then applied in a transparent sequence. This structure supports quick “what-if” checks during negotiations or revisions.
Example Data for a Typical Boundary Wall Section
Use the following sample inputs to validate your workflow and rate assumptions before field deployment. Adjust the rates to your market and the brick size to local supply.
| Parameter | Example | Unit |
|---|---|---|
| Wall length | 10 | m |
| Wall height | 3 | m |
| Thickness | 230 | mm |
| Openings | 2.0 | m² |
| Brick size | 190×90×90 | mm |
| Joint | 10 | mm |
| Mix ratio | 1:6 | cement:sand |
| Brick rate | 22 | per brick |
| Labor rate | 750 | per m² |
Tip: Keep rates in one currency and refresh them weekly for active projects.
FAQs
1) Why does joint thickness affect brick quantity?
The calculator uses “brick plus joint” dimensions to form a unit volume. Larger joints increase unit volume, which reduces the calculated brick count but increases mortar demand.
2) How are openings handled in the estimate?
Opening areas are deducted from gross wall area to produce net wall area. Quantities and labor are based on net area, so doors and windows do not inflate materials or costs.
3) What does the dry volume factor represent?
Dry factor accounts for bulking and voids when converting wet mortar volume to dry ingredient volume. Typical values are around 1.30 to 1.35, depending on site practice and sand moisture.
4) Can I use imperial measurements on site?
Yes. Choose the imperial option to enter length and height in feet and openings in square feet. The calculator converts them internally to metric for consistent volume and mortar computations.
5) Why is cement converted to bags instead of weight?
Site procurement often occurs by bag count. The bag-volume assumption provides a practical bridge from mortar volume to purchase quantities. Update the bag volume if your bag size differs.
6) How are overheads, profit, and contingency applied?
They are applied sequentially on top of the base subtotal (materials, transport, labor, and extras). This produces a transparent build-up that aligns with common estimating practice and tender documentation.
7) What should I do if my field results differ?
Verify brick size, joint thickness, opening deductions, and waste factors first. Then align labor rate basis (per m² or per ft²) and confirm material unit rates match delivered quantities and specifications.