Rebar Weight Chart & Calculator (Online & Free)

Rebar Weight Calculator

Rebar Weight Chart

Note:

(1) Theoretical weight calculation formula of rebar: theoretical weight (kg/m) = 0.00617 × D² (where, D is the section diameter, unit: mm)
(2) The density is calculated as 7.85g/cm³;
(3) The theoretical weight of hot-rolled ribbed bars, cold-rolled ribbed bars, HRB335, HRB400, HRB500 and other deformed bars of different classifications is the same.
(4) The theoretical weight calculated by the formula is different from the actual weight, and the error is generally about 0.2% ~ 0.7%, which can only be used as a reference for estimation.

Weight of Reinforcement With Common Specifications

(weight per meter)

For example:

• Φ6=0.222Kg
• Φ8=0.395Kg
• Φ10=0.617Kg
• Φ12=0.888Kg
• Φ14=1.21Kg
• Φ16=1.58Kg
• Φ18=2Kg
• Φ20=2.47Kg
• Φ22=3Kg
• Φ25=3.86Kg
• Φ28=4.83Kg
• Φ32=6.31Kg
• Φ36=7.99Kg
• Φ40=9.87Kg

Specification of Rebar

The specifications of rebar are essential components in import and export trade contracts, providing crucial details for quality assurance and compliance.

Typically, rebar specifications should encompass:

1. Standard grade (e.g., ASTM A615, BS 4449, or ISO 6935-2)
2. Nominal diameter
3. Nominal weight per unit length
4. Specified length
5. Allowable tolerances for the above parameters

The internationally recognized standard nominal diameters for rebar are 6, 8, 10, 12, 16, 20, 25, 32, 40, and 50mm. These sizes are designed to meet various structural requirements and facilitate standardization across global markets.

Rebar can be supplied in two primary length configurations:

1. Fixed length: Precise, uniform lengths for specific construction needs
2. Multiple lengths: Varied lengths within a specified range, offering flexibility in application

The fixed length range for rebar exports varies by country:

• China: 6-12m
• Japan: 3.5-10m

For domestic rebar in many countries, including the United States, standard lengths are typically 9m (30 feet) or 12m (40 feet) when not otherwise specified in the contract. However, it’s crucial to verify local standards and project requirements, as practices may vary.

Accurate specification of rebar properties ensures structural integrity, facilitates proper material quantification, and streamlines the construction process. It also plays a vital role in quality control, cost estimation, and regulatory compliance in international trade and construction projects.