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Steel reinforcement bars (rebars) play a vital role in strengthening and reinforcing concrete structures. Choosing the right size ensures your project's strength and durability, while calculating weight helps with efficient handling and transport, especially for large quantities.

This guide covers the different steel bar sizes, explains how to calculate their weight, and helps you choose the best one for your project.

 

1. Understanding Steel Bar Sizes in the Philippines

Steel bars in the Philippines are categorized by diameter and are usually measured in millimeters (mm). The most common sizes include:

• 6mm Rebar – For minor reinforcements (tying rebars) and light structures.

• 10mm Rebar – For Residential Homes (One to Two Stories). Often used for slab reinforcements, beams, and small-scale projects.

• 12mm Rebar – Also for Residential Homes (One to Two Stories). A common choice for columns and beams in low-rise buildings.

• 16mm Rebar – For multi-story structures (two or more stories) when combined with other rebar sizes. Suitable for larger beams and columns requiring more strength.

• 20mm – 25mm Rebar – Used for multi-story buildings, bridges, and major infrastructures.

In short, larger diameters provide greater tensile strength, making them ideal for load-bearing components. But they can be unnecessary and costly for minor applications.

 

2. Computing Steel Bar Weight Per Meter Based on Its Size

A rebar's weight is directly related to its size. When purchasing rebar, you typically select the size first, then calculate its weight to estimate costs, plan transportation, and ensure compliance with structural specifications. Below is the formula for determining a rebar's weight per meter based on its size.

Weight per meter= ᵈ²⁄₁₆₂

Where:

• d = diameter of the rebar in millimeters

• 162 is a constant based on the density of steel (7850 kg/m³)

Example Calculation

• For a 16mm rebar:

• (16^2/162) = 256/162, approximately 1.58 kg/m

 

3. Steel Bar Grade is Important as Well

Steel bars come in different grades, indicating their tensile strength. It's important that both the size and grade match the project's requirements.

In the Philippines, common grades include:

• Grade 230 (USA Grade 33) – Suitable for light structures.

• Grade 275 (USA Grade 40) – Used in standard residential and commercial buildings.

• Grade 415 (USA Grade 60) – High-strength steel for large infrastructure projects.

Always check manufacturer markings, thickness, and certification marks like the Philippine Standard (PS) logo to ensure quality.

 

4. Other Factors to Consider When Choosing Rebar Size

• Reinforcement for Natural Disasters – In earthquake-prone areas like the Philippines, buildings need steel bars that can withstand static and dynamic loads. Consult an engineer to determine the required reinforcement for your project.

• Spacing and Quantity of Steel Bars – Thicker bars aren’t always the best solution. Increasing the number of thinner bars can sometimes distribute weight more effectively. Consult an engineer to determine the optimal rebar spacing and placement.

 

5. Common Mistakes to Avoid

• Using undersized steel bars – Some suppliers sell steel bars with diameters slightly smaller than advertised. Always check the size with a caliper before purchasing.

• Overloading weak rebars – Using thin steel bars for heavy-load structures can lead to cracks and failure over time.

• Improperly tying rebars – Loose or weakly tied rebars can shift during concrete pouring, reducing the structure’s strength.

• Ignoring rust and defects – Surface-level rust is acceptable, but excessive corrosion weakens the material. Always inspect rebars before buying.

Final Thoughts

Choosing the right rebar size and grade is crucial for building durable, safe structures. While consulting an engineer is essential for any professional project, understanding rebar sizes and grades is still important. This knowledge helps you avoid mistakes while making the right purchase.

We hope this guide was helpful! If you need more assistance, our team at Mackun Hardware is always ready to help.

 

Check out our assortment of rebar sizes, grades, and their prices here.

 

 

For inquiries and orders you may visit or contact us:

Address: RW Building, Sergio Osmeña Street Cagayan de Oro City, Misamis Oriental 9000

Contact No. : +63 956 037 2805