What Is a Size of a Brick | Types & Properties | Advantages & Uses
Knowing the size of a brick is like knowing the size of a Lego piece. It helps builders put walls together the right way. If bricks are the right size, houses and bridges stay strong and safe.
This guide shows the common brick sizes, the different dimensions used in many countries, and how bricks can be placed. It also talks about the rules we follow, like the IS codes, and the mix ratios for mortar that hold bricks together.
Follow the easy tips in this guide to avoid common mistakes. You will also find simple FAQs that answer the most asked questions about brick sizes and how to use them.
Key Engineering Takeaways & Site Checklist (what is a size of a brick)
Key Engineering Takeaways & Site Checklist (what is a size of a brick)
What Is the Size of a Standard Brick?
A standard brick has a size that most builders use in India and many other places. The size is measured with a ruler and can vary a little because of how the brick is made. The name “Engineer” on a brick usually means the brick is a little taller, not that it is stronger.
Builders follow codes like ASTM C652, ASTM C216, and ASTM C62 to check brick sizes. They also use simple ratios such as 1:2:4 or 1:3:6 when mixing mortar with bricks.
| Property | Typical Value | Notes |
|---|---|---|
| Length | 190 mm (7.48 in) | Measured from one end to the other |
| Width | 90 mm (3.54 in) | Side to side measurement |
| Thickness | 90 mm (3.54 in) | Depth of the brick |
| Allowed Tolerance | ±5 mm | Small variation allowed by code |
- Check length on site. Use a steel tape to read the brick length. Write down the number and compare it with 190 mm. If it is more than 195 mm, the brick may be out of tolerance.
- Measure width and thickness. Place the brick on a flat board. Measure both sides with the same tape. Both should be close to 90 mm. A difference larger than 5 mm can cause gaps in the wall.
- Record the results. Write the three numbers in a notebook. Keep the list for the whole batch of bricks. This helps the foreman know if the supplier is consistent.
Steps to Verify Brick Size on Site
- Lay out a clean, flat surface. Remove dust and debris.
- Pick five bricks from the delivery batch. This gives a small sample.
- Measure each brick’s length, width, and thickness with a steel tape.
- Write each measurement in a table. Look for any number that exceeds the allowed tolerance.
- If a brick fails, set it aside and inform the supplier. Use only bricks that pass the check.
What Are the Dimensions of a Brick?
Bricks come in many shapes, but most follow a common set of dimensions. In metric units, a typical brick is 190 mm long, 90 mm wide, and 90 mm thick. In inches, that is about 7.48 × 3.54 × 3.54.
Another way to write the size is 8⅜ inches wide, 4 inches high, and 2¼ inches deep. This description is often used in the United States. Brick pavers, a special type of brick, are usually 4 × 8 inches.
| Unit | Length | Width | Thickness |
|---|---|---|---|
| Metric | 190 mm | 90 mm | 90 mm |
| Imperial | 7.48 in | 3.54 in | 3.54 in |
| Common US | 8⅜ in | 4 in | 2¼ in |
- Know the code. In India, IS 190 tells the government’s size rules. The code says the brick should be close to 190 mm × 90 mm × 90 mm. Following the code helps avoid legal problems.
- Mind the tolerances. The code also allows a small change of about 90 mm, 215 mm, or 65 mm for special bricks. Always check the supplier’s paperwork for these numbers.
- Match mortar mix. When you know the brick size, you can pick the right mortar ratio like 1:2:4. This means 1 part cement, 2 parts sand, and 4 parts aggregate. The right mix makes the wall strong.
Simple Steps to Choose the Right Brick Size
- Read the project drawing. It tells which brick size to use.
- Ask the supplier for a size certificate. This shows the brick meets IS 190 or ASTM standards.
- Take a sample brick and measure it with a steel tape.
- Compare the numbers to the drawing and the certificate.
- If they match, approve the batch. If not, request a new batch.
Brick Dimension and Size in Different Countries
Brick size is not the same everywhere. Different places use different numbers for length, width and height. The size you pick changes how thick a wall will be and how strong it can hold.
In India the most common brick follows IS 240. It is about 190 mm long, 90 mm wide and 65 mm high. In the UK a standard brick is a little bigger – about 215 mm × 102.5 mm × 65 mm. In the United States many bricks are measured in inches – roughly 190 mm × 90 mm × 57 mm (7½ × 3 ⅝ × 2¼ in).
| Country | Length | Width | Height |
|---|---|---|---|
| India | 190 mm | 90 mm | 65 mm |
| United Kingdom | 215 mm | 102.5 mm | 65 mm |
| United States | 190 mm | 90 mm | 57 mm |
| Australia | 230 mm | 110 mm | 76 mm |
Common Burnt Clay Brick
These bricks are made from natural clay that is baked at high temperature.
- Composition: about 70 % clay, 20 % sand, 10 % water. The clay gives shape, sand adds strength, water helps the mix stay workable.
- Standards: IS 240 for India, ASTM C 62 for the USA. The standards tell us the exact size limits and strength that the brick must meet.
- Strength: typically 7–10 MPa compressive strength. This means the brick can hold the weight of a small wall without cracking.
- Setting time: bricks do not set; they are already hard after firing. You only need to wait for the mortar to cure.
- Typical use: residential walls, garden fences, low‑rise buildings. They are cheap and easy to find.
- How to use (site steps):
- Prepare the wall surface by cleaning dust and loose material. A clean surface lets mortar stick well.
- Mix mortar with a water‑to‑cement ratio of 0.5. Too much water makes mortar weak, too little makes it hard to work with.
- Check the mortar slump; it should be about 75 mm. This gives the right flow without being runny.
- Lay bricks with a 10 mm mortar joint. The joint fills gaps and spreads load evenly.
- Tap each brick gently with a rubber mallet to compact the mortar. Good compaction removes air pockets.
- After a full layer, wet the wall lightly and cover with a plastic sheet for 7 days. This curing keeps moisture in, letting the mortar gain strength.
- Test the wall after curing by tapping – a solid sound means good bonding.
- Advantages: low cost, widely available, good fire resistance. They work well for most everyday projects.
- Limitations: lower compressive strength than engineered bricks, can absorb water if not properly pointed.
Fly Ash Brick
Fly ash bricks are made from waste ash from power plants mixed with cement.
- Composition: 50 % fly ash, 30 % cement, 20 % sand and water. Fly ash makes the brick light, cement gives strength.
- Standards: IS 383 for India, ASTM C 1152 for the USA. These standards set limits for water absorption and strength.
- Strength: 10–12 MPa compressive strength, higher than common clay bricks. This makes them good for medium‑rise structures.
- Setting time: mortar sets in about 24 hours, but the brick itself is already solid.
- Typical use: load‑bearing walls, industrial floors, areas where low weight is needed.
- How to use (site steps):
- Clear the foundation and dampen it lightly. A damp surface prevents rapid moisture loss from the mortar.
- Prepare a mortar mix with a water‑to‑cement ratio of 0.45. Less water gives higher strength.
- Check slump; aim for 70 mm. This ensures the mortar is workable but not too wet.
- Lay fly ash bricks with a 12 mm joint to allow for slight expansion.
- Compact each brick with a light hammer strike. Proper compaction avoids gaps.
- Cover the wall with wet burlap for 5 days. The moisture helps the mortar cure fully.
- After curing, perform a simple pull‑out test to confirm the bricks are well bonded.
- Advantages: lighter than clay bricks, uses industrial waste, good fire and sound insulation.
- Limitations: may swell slightly in very wet conditions, needs good quality mortar to avoid cracks.
Concrete Brick
Concrete bricks are made from cement, sand, gravel and water, poured into molds.
- Composition: 15 % cement, 35 % sand, 45 % gravel, 5 % water. Cement binds the mix, sand fills gaps, gravel adds bulk.
- Standards: IS 383, ASTM C 216. These set limits for density, compressive strength, and water absorption.
- Strength: 15–20 MPa, strong enough for many structural walls.
- Setting time: mortar sets in 24 hours; concrete bricks cure over 7 days for full strength.
- Typical use: foundations, retaining walls, high‑rise block work.
- How to use (site steps):
- Moisten the sub‑base to reduce water loss from the mortar.
- Mix mortar with a water‑to‑cement ratio of 0.48; too much water weakens the bond.
- Maintain a slump of 80 mm for smooth spreading.
- Place concrete bricks with a 10 mm joint, using a trowel to press mortar into the joint.
- Use a spirit level to keep each course level; straight walls resist cracking.
- After each course, lightly spray water and cover with a curing blanket for 7 days.
- Perform a compressive test on a sample brick after 28 days to verify strength.
- Advantages: high strength, low water absorption, good for heavy loads.
- Limitations: heavier to lift, higher cost, needs careful handling to avoid breakage.
Engineering Brick
Engineering bricks are made to be very strong and very low in water absorption.
- Composition: 20 % clay, 10 % silica, 70 % iron‑oxide rich material. Silica gives hardness, iron oxide adds color and durability.
- Standards: IS 383 (Class A), ASTM C 62 (Class A). These classes require at least 15 MPa strength and < 5 % water absorption.
- Strength: 15–30 MPa, much higher than ordinary bricks.
- Setting time: mortar sets in 24 hours; brick itself is already cured.
- Typical use: foundations, damp‑proof walls, chemical plants where water resistance matters.
- How to use (site steps):
- Ensure the foundation is level and free of oil or grease.
- Mix a low‑water mortar (w/c = 0.42) for maximum bond strength.
- Check slump; target 65 mm to keep mortar stiff.
- Lay engineering bricks with a 10 mm joint, making sure the face is clean.
- Use a rubber mallet to seat each brick fully, avoiding air pockets.
- After laying, keep the wall damp for 10 days to achieve full strength.
- Test water absorption on a sample brick; it should be less than 5 %.
- Advantages: very strong, low water absorption, excellent for load‑bearing and wet areas.
- Limitations: higher price, heavier, may require special handling equipment.
Brick Orientation
How you turn a brick on the wall changes the strength and look of the wall. The most common ways are called “stretcher”, “header” and “English” bonds.
When a brick is laid flat with its long side showing, it is a stretcher. When the short side faces out, it is a header. Mixing both in a pattern gives extra tie‑strength between courses.
Stretcher Bond
All bricks are laid with the long face showing. This gives a smooth wall surface.
- Why use it: It is the fastest way to build a wall because you only need one brick per opening.
- How it works: Each brick overlaps the one below by half its length, spreading load evenly.
- Strength: Good for non‑load‑bearing walls; the overlap gives decent shear resistance.
- Steps to lay:
- Start with a level foundation and apply a 10 mm mortar bed.
- Place the first brick with the long side out, tap it gently to set.
- Lay the next brick so its end rests on the middle of the brick below (half‑brick offset).
- Continue the pattern, checking each brick with a spirit level.
- After each course, brush excess mortar away and smooth the joint.
- Cover the wall with damp burlap for 5 days to cure the mortar.
- Advantages: Simple, fast, uses fewer bricks per square meter.
- Limitations: Not as strong as bonds that tie bricks together across the wall thickness.
Frequently Asked Questions on what is a size of a brick
What are the standard dimensions of a brick as per IS 1193 and how do they vary for structural and non‑structural bricks?
IS 1193 (2019) defines the “standard brick” (also called “masonry brick”) as having a nominal size of 190 mm × 90 mm × 90 mm (length × breadth × height). The tolerances are ±2 mm for length, ±1 mm for breadth and height. For structural bricks (used in load‑bearing walls, arches, lintels, etc.) the dimensions are identical, but the compressive strength must be ≥ 20 MPa (minimum) and typically 25–30 MPa for high‑rise or seismic applications. Non‑structural bricks (partition walls, veneers) may be manufactured in the same size but are often graded for lower strength (≥ 10 MPa). In India, the most common non‑structural brick is the “solid brick” of the same 190 mm × 90 mm × 90 mm size; hollow core bricks (e.g., 190 mm × 90 mm × 90 mm with a 60 mm core) are also widely used for non‑load‑bearing walls to reduce weight.
How does the brick size affect the load‑bearing capacity of a masonry wall in a seismic zone?
In seismic design (IS 456:2000, Clause 4.3.4), the load‑bearing capacity of a brick wall is a function of brick compressive strength, wall thickness, and mortar joint width. A larger brick (e.g., 190 mm × 90 mm × 90 mm) provides a greater cross‑sectional area per unit length, which increases the wall’s axial capacity. However, larger bricks also increase the wall’s mass and inertia, which can be detrimental in seismic zones if not properly reinforced. The recommended practice is to use standard bricks (190 mm × 90 mm × 90 mm) with 10 mm mortar joints for walls ≥ 400 mm thick, and to incorporate vertical reinforcement (≥ 10 mm diameter bars) at 600 mm centres. If a wall is thinner (< 300 mm), a hollow core brick (190 mm × 90 mm × 90 mm with 60 mm core) is preferable to reduce mass while maintaining structural integrity, provided the wall is reinforced as per IS 3375.
What is the recommended mortar joint width for standard bricks in high‑rise construction, and how does it influence the overall wall thickness?
For high‑rise masonry (IS 456:2000, Clause 4.3.3), the mortar joint width is typically 10 mm for standard bricks. A 10 mm joint offers a good balance between structural performance and material economy. The overall wall thickness is calculated as:
Wall thickness = (Number of brick lengths × 190 mm) + (Number of mortar joints × 10 mm)
For a 400 mm thick wall, you would use 2 brick lengths (2 × 190 mm = 380 mm) plus 1 joint (10 mm) = 390 mm, and add a 10 mm mortar layer on the exterior to reach 400 mm. Thinner joints (5 mm) reduce material consumption but may compromise the wall’s ability to accommodate shrinkage and temperature changes, especially in seismic zones.
How do I calculate the number of bricks required for a wall when using bricks with a 90 mm length versus a 190 mm length?
First, determine the wall area (length × height). Then calculate the effective brick area including mortar:
Effective brick area = (brick length + mortar joint) × (brick breadth + mortar joint)
For a 190 mm × 90 mm brick with 10 mm mortar:
Effective area = (190 mm + 10 mm) × (90 mm + 10 mm) = 200 mm × 100 mm = 20 000 mm²
For a 90 mm × 90 mm brick (used in some low‑rise or partition walls) with 10 mm mortar:
Effective area = (90 mm + 10 mm) × (90 mm + 10 mm) = 100 mm × 100 mm = 10 000 mm²
Number of bricks = (Wall area in mm²) ÷ (Effective brick area in mm²) × 1.05 (to allow for 5 % wastage). Example: a 10 m × 3 m wall (30 000 000 mm²) would need:
Standard bricks: 30 000 000 ÷ 20 000 = 1500