🧱 Masonry Calculator PRO
Calculate bricks, mortar, wall ties, lintel steel, reinforcement, and total cost for any masonry wall.
Dimension Diagram — updates as you type
Net wall area (minus openings) divided by the block face gives the unit count. Mortar follows from joints.
1Brick & Wall Type
2Wall Dimensions
3 Openings (Windows & Doors)
No openings added. Click "+ Add Opening" to deduct windows or doors.
4🔩 Lintel Steel Calculation
Steel lintels are required above all openings. Calculation based on standard 4" bearing each side.
Add openings above to calculate lintel requirements.
5 🔗 Wall Ties & Reinforcement
Code: Ties spaced max 24" o.c. vertically & horizontally (IRC R608.10). Rows at each course or every other course.
Wall ties not required for this wall type.
6Pricing
Labour Cost
Project Details
Results
Area
Brick & Mortar
⚠️ Pre-Export Checklist
- Wall dimensions verified on-site
- All opening sizes confirmed by architect
- Brick type and colour selected
- Mortar mix ratio specified by engineer
- Wall ties type and spacing per code
- Lintel sizes verified for structural loads
- Control/expansion joints locations marked
How to Calculate Bricks, Mortar & Reinforcement for Masonry Walls
Show formulas, brick specs & worked examples ▼
Brick Specifications
| Type | Actual (in) | Nominal (in) | Bricks/sqft (½" joint) |
|---|---|---|---|
| Modular | 7⅝ × 2¼ × 3⅝ | 8 × 2⅝ × 4 | 6.75 |
| King | 7⅝ × 2¾ × 2⅝ | 9⅞ × 3⅛ × 2¾ | 5.76 |
| Queen | 7⅝ × 2¾ × 3⅝ | 8 × 3⅛ × 4 | 6.75 |
| Jumbo | 7⅝ × 3⅝ × 2⅝ | 8 × 4 × 3 | 5.56 |
| Closure | 7⅝ × 3⅝ × 3⅝ | 8 × 4 × 4 | 4.50 |
| Norwegian | 7⅝ × 3⅝ × 11⅝ | 8 × 4 × 12 | 1.50 |
Formulas
Gross Area = Length × Height
Net Area= Gross Area − Sum of All Openings
Bricks Needed= Net Area × Bricks/sqft × Wythe Factor × (1 + Waste%)
Mortar Volume= Net Area × (Joint Size / 12) × (Brick Height / 12) × (Brick Width / 12) × Wythe Factor
Cement (bags)= Mortar Volume × Ratio Cement Part ÷ 1 ft³/bag
Sand (cu yd)= Mortar Volume × Ratio Sand Part ÷ 27
Wall Ties= ⌈Length ÷ Tie Spacing⌉ × ⌈Height ÷ 16⌉
Lintel Length= Opening Width + 8" (4" bearing each side)
Lintel Steel= Lintel Length (in) × Weight per inch (kg/in)
Worked Example — Cavity Wall with Openings
30 ft × 10 ft cavity wall, Modular brick, ½" joint, 1:4 mortar, 2 windows (36"×48") + 1 door (36"×84"):
- Gross area: 30 × 10 = 300 sqft
- Window openings: 2 × (3 × 4) = 24 sqft
- Door opening: 1 × (3 × 7) = 21 sqft
- Net area: 300 − 24 − 21 = 255 sqft
- Bricks (double wythe × 2): 255 × 6.75 × 2 × 1.05 = 3,607 pcs
- Mortar: 255 × 0.042 × 2 = 21.4 cuft
- Cement (1:4): 21.4 × 0.25 = 6 bags
- Sand: 21.4 × 0.75 ÷ 27 = 0.59 cu yd
- Wall ties (16" o.c.): 23 rows × 23 ties = 529 ties
- Lintels: (36+8) + (36+8) + (36+8) = 132" = 3.36m
Mortar Ratios — When to Use
- 1:3 — Structural masonry, load-bearing walls, foundations, below-grade work
- 1:4 — General-purpose, most exterior and interior walls, parapets
- 1:6 — Non-load-bearing, partitions, garden walls, decorative work
Wall Types Explained
- Single Wythe — One layer of brick (4"–4.5" thick). Most common for garden walls and non-structural partitions.
- Double Wythe — Two layers laid together (8"–9" thick). Stronger load-bearing capacity.
- Cavity Wall — Two wythes with an air gap (drainage cavity). Best weather resistance. Requires wall ties.
- Veneer — One wythe brick tied to a structural frame (wood, steel, concrete). Most common in modern construction.
Common Mistakes to Avoid
- Not subtracting openings — overestimates bricks by 10-15%
- Wrong joint size — ⅜" vs ½" changes brick count by ~5%
- Using wrong mortar ratio for structural vs non-structural applications
- Skip lintel calculation — every opening needs steel support above
- Ignoring control joints — leads to cracking from thermal expansion
- Not ordering enough wall ties for cavity walls
Pro Tips
- Order 5-10% extra bricks for cuts and breakage
- Mix mortar in small batches — pot life is 1-2 hours
- Pre-wet bricks on hot days to prevent suction from weak mortar bond
- Use a string line for every course — ensures straight, consistent joints
- Control joints: max 20 ft spacing for walls under 20 ft height
- Expansion joints: max 30 ft for walls exposed to temperature extremes
- Check local building codes for lintel and tie requirements
Drag to rotate — Scroll to zoom
Calculadoras Relacionadas
Frequently used together on the same project.
Client & Quote (prints on PDF & Excel)
Adjustments (applies to exports)
Contingency is added as a separate line on the exported cost summary. Waste % is printed as an advisory reminder.
Project notes (prints on PDF & Excel)
Result compare (A/B)
| Item | Pinned | Current | Change |
|---|---|---|---|
Saved rates auto-apply from your Price Library. Advanced details stay in your browser — nothing is uploaded except inside your own PDF/Excel exports.
Brick and block work is one of the oldest construction trades, and accurate material estimation is critical to staying on budget. Our free online masonry calculator determines the number of bricks or blocks needed for any wall, computes mortar volume, and converts that to cement bags and sand quantity.
The calculator works from wall dimensions and the specific unit size you are using. Standard modular bricks require approximately 6.75 bricks per square foot of wall face. The mortar volume calculation uses a standard ratio of roughly 0.7 cubic feet of mortar per 100 bricks.
📖 Como Usar Esta Calculadora de Alvenaria
Step 1: Enter Wall Dimensions
Type the length and height of the wall in feet.
Step 2: Select Unit Type
Choose standard brick, modular brick, king brick, or concrete block (CMU).
Step 3: Set Mortar Joint Size
Standard mortar joints are 3/8 inch for brick and 3/8 to 1/2 inch for block.
Step 4: Choose Mortar Mix Ratio
Select 1:3 (rich), 1:4 (standard), or 1:5 (lean).
Step 5: Enter Material Costs
Input per-unit cost for bricks or blocks, price per bag for cement, per ton for sand.
Step 6: Review Results
The output shows total bricks or blocks, mortar volume, cement bags, sand, and total cost.
📐 A Fórmula de Alvenaria
Brick count is calculated from wall area and unit face dimensions. Bricks per Sq Ft = 1 / ((Brick Length + Mortar Joint) × (Brick Height + Mortar Joint)). A standard modular brick with a 3/8-inch mortar joint gives approximately 6.75 bricks per square foot.
For a 20 ft by 8 ft wall: Wall area = 160 square feet. Bricks needed = 160 × 6.75 = 1,080 bricks. Add 5% waste: 1,134 bricks. Mortar volume is approximately 0.7 cubic feet per 100 bricks: 7.56 cubic feet of mortar.
For concrete blocks at 8x8x16 inches, the calculation uses 1.125 blocks per square foot. A 20 ft by 8 ft block wall requires 180 blocks, plus 5% waste = 189 blocks.
⚠️ Erros Comuns a Evitar
Not accounting for mortar joints in brick count
✓ Mortar joints reduce the number of bricks per square foot. Ignoring them overestimates by 10 to 15%.
Using the wrong mortar mix ratio
✓ Structural walls need 1:3 mix. Using weak mix on load-bearing walls is a structural failure risk.
Not accounting for wall openings
✓ Doors, windows, and pass-throughs reduce brick count but add lintel costs.
Underestimating mortar quantity
✓ Mortar shrinks as it cures. Order 10 to 15% more than the calculated volume.
💡 Dicas Profissionais
Soak bricks in water for at least one hour before laying. Dry bricks pull moisture from the mortar.
Use a string line for every course. Even experienced masons develop a lean over long walls without a guide line.
Mix mortar in small batches. Mortar stiffens after about 90 minutes in the tub.
Install wall ties every 24 inches horizontally and 16 inches vertically for veneer walls.
❓ Perguntas Frequentes
Standard modular bricks require approximately 6.75 bricks per square foot, including mortar joints.
A 1:3 ratio is used for structural walls. A 1:4 ratio is standard for most applications.
For 100 standard bricks, you need approximately 2 bags of Portland cement plus about 5 cubic feet of sand.
Mortar reaches initial set in 2 to 4 hours. Full cure takes 28 days.
🏗️ Aplicações Reais
Masonry estimation is essential for staying on budget because brick and block costs add up fast. A standard 20 ft by 8 ft brick wall requires approximately 1,080 bricks and costs 800 to 1,200 dollars in materials.
For a full house brick veneer with 1,400 square feet of wall area, you need about 9,450 bricks. The calculator prevents overbuying or underbuying, both of which are costly.
Our free masonry calculator is the most accurate online tool for estimating brick count, mortar volume, cement bags, and masonry material costs. Get accurate quantities before laying the first unit.
✅Method, Sources & Review
Maintained by theBuildingCalc methods desk· Last reviewedSeptember 23, 2026. This calculator implements the standards and references below; every figure can be rechecked against the formulas and worked example on this page.
Results are estimates, not engineering advice. Verify against local codes and licensed professionals for structural, electrical, and gas work. See ourTerms. Spotted an error? Report it— corrections ship with the next review.