Masonry & Riprap Estimator
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Project Information
| Project Engineer | |
| Project Location |
1. Masonry Works (CHB)
Calculates hollow blocks, mortar (laying), and plastering.
Show Calculation Logic
Standard: 12.5 blocks per m².
Formula: Net Area = (H × L) - Awindows - Adoors.
Mortar: 4" (0.53 bags/m²), 6" (1.02 bags/m²).
Plaster (Class B): 0.294 bags/m² per face.
Formula: Net Area = (H × L) - Awindows - Adoors.
Mortar: 4" (0.53 bags/m²), 6" (1.02 bags/m²).
Plaster (Class B): 0.294 bags/m² per face.
| Wall Height (H) | m | |
| Wall Length (L) | m | |
| Window Area | sq.m | |
| Door Area | sq.m | |
| Breakage % | % | |
| Block Size | ||
| Plastering | ||
| Net Wall Area | sq.m | |
| Total CHB | pcs | |
| Mortar Cement | bags | |
| Mortar Sand | cu.m | |
| Plaster Cement | bags | |
| Plaster Sand | cu.m | |
Figure 1: CHB Wall & Mortar Joints
2. Grouted Riprap Works
Volume calculation for trapezoidal slope protection (Class A Mortar).
Show Calculation Logic
Formula: Volume = ½(W1 + W2) × H × L.
Factors: Cement (2.611 bags/m³), Sand (0.1444 m³/m³), Boulders (1.0 m³/m³).
Factors: Cement (2.611 bags/m³), Sand (0.1444 m³/m³), Boulders (1.0 m³/m³).
| Height (H) | m | |
| Top Width (W1) | m | |
| Bottom Width (W2) | m | |
| Length (L) | m | |
| Total Volume | cu.m | |
| Boulders | cu.m | |
| Cement (Grout) | bags | |
| Sand (Grout) | cu.m | |
Figure 2: Riprap Cross Section
About this Calculator
This tool estimates materials for masonry and slope protection works according to Philippine construction standards.
References
- Simplified Construction Estimate by Max Fajardo Jr.
- CONST_ESTIMATE_MADE_EASY_BY_ENGR_CAJILLA.xls
Usage Guide
Enter the dimensions of your wall or slope. Adjust waste percentage as needed. Click "Recalculate" to update the Bill of Materials.
Disclaimer: For estimation purposes only. Verify with a licensed engineer.
Calculated via EngineeringStuffs.com. For estimation purposes only. Verify with a licensed engineer.