Plan walls with blocks, mortar, and labor inputs. See unit rates, mix ratios, and allowances. Export results to share with teams and clients quickly.
| Input set | Wall (L × H) | Openings | Block size | Joint | Waste | Estimated blocks | Estimated mortar |
|---|---|---|---|---|---|---|---|
| Sample A | 12 m × 3 m | 1.2 m² | 400 × 200 mm | 10 mm | Blocks 5%, Mortar 8% | ≈ 447 blocks | ≈ 0.28 m³ |
| Sample B | 8 m × 2.7 m | 0.8 m² | 450 × 225 mm | 10 mm | Blocks 7%, Mortar 10% | ≈ 273 blocks | ≈ 0.20 m³ |
This calculator converts wall geometry into a practical material takeoff for budgeting. It targets straight walls, uniform thickness, and standard joints. Openings are deducted as net area, then allowances are added for cutting, breakage, and handling losses. Treat the output as a planning baseline, and refine it with drawings, bond patterns, lintels, and site constraints.
Block length, height, and joint thickness control the module area, which determines blocks per square meter. Small changes in joint thickness can noticeably shift counts on large walls. Wall thickness influences mortar volume because it multiplies bed and perpend volumes. Openings matter most when they are clustered, because additional returns and reveals may increase waste beyond simple area subtraction.
Mortar is first estimated as wet volume from joint geometry, then converted to dry ingredients using a dry volume factor. The selected mix ratio splits the dry volume into cement and sand shares. Bag volume is an assumption, so align it with your local bag size and density practice. If you use preblended mortar, compare the calculated dry volume to supplier yield data.
Unit rates turn quantities into direct material cost. Use recent quotations, include delivery, and confirm whether blocks are priced per piece or per pallet. Cement rounding is intentional to avoid short supply; if storage is tight, run scenarios with smaller rounding rules. For sand, check moisture and bulking impacts on delivered volume, and apply conservative waste when access is difficult.
After calculation, export the report for review during estimating, tendering, or site planning. Validate results by measuring a representative bay on site and comparing actual blocks laid per square meter. Adjust waste factors until the estimate matches your typical crew performance. Keep a record of final settings so future projects start with calibrated assumptions and faster approvals. Use site photos and daily counts to confirm your consumption trends regularly.
No. It estimates blocks and mortar materials only. Add reinforcement, lintels, ties, and grout separately based on your structural details and specifications.
Joint thickness changes the block module size. A larger module area reduces blocks per square meter, while a smaller module increases blocks per square meter.
Many teams use 1.25 to 1.35 for mortar. Choose a factor that matches your site mixing method and compare against past consumption records.
Start with 3–7% for blocks and 5–12% for mortar. Increase allowances for complex details, many openings, poor access, or frequent cutting.
Yes. Enter your block length and height, and keep units in millimeters. Confirm the wall thickness matches the block width used on site.
Cement is usually purchased and issued by bag. Rounding avoids shortages and delays, and it reflects typical procurement practice for small-to-medium jobs.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.