The unit weight of steel bars of dia 8mm, 10mm, 6mm, 12mm, 16mm, 20mm and so on higher depends on diameter of steel rods, length of steel rods, manufacturing process and density of steel. You can calculate the weight of steel rods by using steel formula D^2L/162, where D = diameter of rebar in mm and L = length of rebar in meter.

The steel bars are also known as by various name like steel rods, rebar (reinforcing bar), TMT bars (Thermo Mechanically Treated bars)

TMX bars (Thermex steel), Tor steel (Toristeg Steel Corporation of Luxembourg) & HYSD (High Yield Strength Deformed) bars based on manufacturing process, location, properties and latest technology. However, all different types of steel bars have common density and weight per unit volume, or little bit fluctuation.

Steel also known as reinforcement bars or rebar embedded in concrete member to increase their tensile strength. As we know that Steel are used in formation of structural member like column, beam, footing, foundation, slab of building. Different size of Steel bar supply by supplier having length 12 metre or 40 ft.

Unit mass of steel or rebar is the ratio of weight of Steel to its per unit volume. Usually it is expressed in kilograms per cubic metre (kg/m3) or Pounds per cubic feet (lb/ft3). Unit mass of steel is 7850 kg/m3 (kilograms per cubic metre) or 490 lbs/ft3 (pounds per cubic feet).

**Unit weight of steel **

The unit weight of steel is defined as the ratio of mass of steel to unit volume of steel. The unit weight of steel is generally measured in kilogram per cubic meter is 7850kg/m3, measured in kilo-Newton per cubic meter is 78.5kN/m3 or measured in gram per cubic centimetre is 7.85 g/cm^3, which is approximately equal in pounds per cubic feet is 490 lbs/ft3 or measured in Pounds per cubic yards is 13,231 lbs/yd^3.

**Steel bars size and length**

Generally steel bars come in diameter of 6mm (2 soot), 8mm (2.5 soot), 10mm (3 soot), 12mm (4 soot), 16mm (5 soot), 20mm (6 soot), 25mm (8 soot), 32mm and so on– and supplied in straight or U shaped bent length of 12 meters or 40 feet.

**Formula for unit weight of steel**

Unit Weight of steel is defined as ratio of weight of steel to its unit volume, weight of Steel measured in kilogram (kg) and pounds (lbs) and its volume is measured in cubic metre (m3) and cubic feet (ft3). Then its unit weight = unit mass/unit volume, represented as W = m/V, where W is Steel unit weights, m for mass and V for volume. It is also known as specific weight of steel or density of steel and their SI unit is kilogram per cubic metre (kg/m3). Steel is most used element in civil engineering for structural construction, after knowing the Steel Unit Weight, it is easy to calculate amount of Steel required for projects.

**Unit weight of steel bars:8mm, 10mm, 12mm, 16mm, 20mm ..**

The unit weight of the steel bars (rods) or rebar is assumed to be 7,850 kg/m3 or 78.5 kN/m3 or 7.85 grams per cubic centimeter or 490 pounds per cubic foot or 13,231 Pounds per cubic yard. The unit weight of steel or specific gravity of steel is the ratio of the mass of steel to its per unit volume. Steel bars are mainly used as reinforcement to reinforce concrete structures.

**8mm steel rod weight in kg**

The typical weight of a 8mm of steel bar (rod or rebar) is about 0.395 kilograms per meter (kg/m), 0.12 kilograms per foot (kg/ft), 4.74 kilograms per rod (12 meters full length) and 47 kilograms per bundle (for 10 rods).

**10mm steel rod weight in kg**

The typical weight of a 10mm of steel bar (rod, or rebar) is about 0.617 kilograms per meter (kg/m), 0.188 kilograms per foot (kg/ft), 7.407 kilograms per piece (12 meters full length) and 52 kilograms per bundle (for 7 rods).

**12mm steel rod weight in kg**

The typical weight of a 12mm of steel bar (rod, or rebar) is about 0.89 kilograms per meter (kg/m), 0.27 kilograms per foot (kg/ft), 10.66 kilograms per piece (12 meters or 40 ft full length) and 53 kilograms per bundle (5 rods).

**16mm steel rod weight in kg**

The typical weight of a 16mm of steel bar (rod, or rebar) is about 1.58 kilograms per meter (kg/m), 0.48 kilograms per foot (kg/ft), 18.96 kilograms per piece (12 meters or 40 ft full length) and 57 kilograms per bundle (for 3 rods).

**20mm steel rod weight in kg**

The typical weight of a 20mm of steel bar (rod, or rebar) is about 2.47 kilograms per meter (kg/m), 0.751 kilograms per foot (kg/ft), 29.63 kilograms per piece (12 meters or 40 ft full length) and 59 kilograms per bundle (for 2 rods).

**25mm steel rod weight in kg**

The typical weight of a 25mm of steel bar (rod, or rebar) is about 3.86 kilograms per meter (kg/m), 1.174 kilograms per foot (kg/ft), 46 kilograms per piece (12 meters or 40 ft full length) and 46 kilograms per bundle (for 1 rod).

**32mm steel rod weight in kg**

The typical weight of a 32mm of steel bar (rod, or rebar) is about 6.32 kilograms per meter (kg/m), 1.925 kilograms per foot (kg/ft), 75.84 kilograms per piece (12 meters or 40 ft full length) and 76 kilograms per bundle (for 1 rod).

**40mm steel rod weight in kg**

The typical weight of a 40mm of steel bar (rod, or rebar) is about 9.87 kilograms per meter (kg/m), 3 kilograms per foot (kg/ft), 118.52 kilograms per piece (12 meters or 40 ft full length) and 118. kilograms per bundle (for 1 rod).

**6mm steel rod weight**

The typical weight of a 6mm of steel bar (rod or rebar) is about 0.22 kilograms per meter (kg/m), 0.0675 kilograms per foot (kg/ft), 2.67 kilograms per rod (12 meters full length) and 53 kilograms per bundle (for 20 rods).

**The typical unit weight of steel bars per meter**

The typical unit weight of 6mm steel bar is about 0.222 kg/m, 8 mm is about 0.395 kg/m, 10 mm is about 0.617 kg/m, 12 mm is about 0.89 kg/m, 16 mm is about 1.58 kg/m, 20 mm is about 2.47 kg/m, 25 mm is about 3.86 kg/m and 32 mm is about 6.32 kg/m.

**Unit weight of Steel per foot**

The typical unit weight of a 6mm Steel bar is about 0.067kg per foot, 8mm steel is 0.120kg per foot, 10mm steel is 0.188kg per foot, 12mm steel is 0.270kg per foot, 16mm steel is 0.480kg per foot, 20mm steel is 0.751kg per foot, 25mm steel is 1.174kg per foot and for 32mm steel is 1.925kg per foot.

**Rod weight per bundle: 12mm, 10mm, 8mm, 16mm, 20mm & 25mm steel bar**

**Rod weight per piece: 12mm, 10mm, 8mm, 16mm, 20mm & 25mm steel bar**

**Rod weight per meter: 12mm, 10mm, 8mm, 16mm, 20mm & 25mm steel bar**

**Unit weight of steel in pounds per foot**

The typical unit weight of #2.5 rebar or steel bars is about 0.265 pounds per foot, #3 rebar is 0.376lb/foot, #4 rebar is 0.668lb per foot, #5 rebar is 1.043lb per foot, #6 rebar is 1.502lb/ foot, #7 rebar is 2.044lb/ foot, #8 rebar is 2.67lb/ foot, #9 rebar is 3.40lb/ foot, #10 rebar is 4.303lb/ foot and #11 rebar is 5.313lb/foot.

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**Unit weight of steel in kg/m3**

The typical unit weight of steel is 7,850 kg/m3. It means when measured in cubic metre, weight of 1m3 of steel is around 7,850kg. Thus, 7,850 kilograms per cubic meter is the unit weight of steel in kg/m3.

**Unit weight of steel in kN/m3**

The typical unit weight of steel is 78.50 kN/m3. It means when measured in kilo Newton, a typical 1m3 of steel weight is around 7,850kN. Thus, 7850 kilo -Newton per cubic meter is the unit weight of steel in kN/m3.

**Unit weight of steel in N/mm^3**

7.85× 10^-8 is the Unit weight of steel in N/mm^3. It means when measured in Newton, a typical 1mm3 of steel weight is around 7.85 × 10^-8 N. Thus, 7.850 × 10^-8 Newton per cubic millimeter is the unit weight of steel in N/mm3.

**Unit weight of steel in kg/ft3**

222 is the Unit weight of steel in kg/ft3. It means when measured in kg, a typical 1ft3 of steel weight is around 222kg. Thus, 222 kilograms per cubic foot is the unit weight of steel in kg/ft3.

**Unit weight of steel in lb/ft3**

490 is the Unit weight of steel in lb/ft3. It means when measured in pound, a typical 1ft^3 of steel weight is around 490 pounds. Thus, 490 pounds per cubic foot is the unit weight of steel in lb/ft3.

**Unit weight of steel in g/cm3**

7.85 is the Unit weight of steel in g/cm3. It means when measured in grams, a typical 1cm3 of steel weight is around 7.85 grams. Thus, 7.85 grams per cubic centimeter is the unit weight of steel in g/cm3.

**Unit weight of steel bars formula**

There are two formula to calculate unit weight of steel bars, 1) D^2L/162 & 2) D^2L/533. This formula, D^2L/162 of steel bars are used to calculate weight of steel per meter, for example unit weight of 8mm diameter of steel = (8×8×1)÷162 = 0.395 kg/m. The D^2L/533 steel bars formula are used to calculate weight of steel per foot, for example unit weight of 8mm diameter of steel = (8×8×1)÷533 = 0.12 kg/ft.

**Unit weight of steel 6mm**

The typical unit weight of 6mm dia of steel bar or rod is around 0.222kg per meter which is approximately equal as 0.0676 kg per foot. One piece of 12 meter (40 ft) length of 6mm diameter of steel rods weight is 2.664 kgs.

**Unit weight of steel 8mm**

The typical unit weight of 8mm dia of steel bars or rods is around 0.395kg per meter which is approximately equal as 0.12 kg per foot. One piece of 12 meter (40 ft) length of 8mm diameter of steel rods weight is 4.74 kgs.

**Unit weight of steel 10mm**

The typical unit weight of 10mm dia of steel bars or rods is around 0.617kg per meter which is approximately equal as 0.188 kg per foot. One piece of 12 meter (40 ft) length of 10 mm diameter of steel rods weight is 7.407 kgs.

**Unit weight of steel 12mm**

The typical unit weight of 12mm dia of steel bars or rods is around 0.889kg per meter which is approximately equal as 0.27 kg per foot. One piece of 12 meter (40 ft) length of 12 mm diameter of steel rods weight is 10.667 kgs.

**Unit weight of steel 16mm**

The typical unit weight of 16mm dia of steel bars or rods is around 1.58kg per meter which is approximately equal as 0.48 kg per foot. One piece of 12 meter (40 ft) length of 16 mm diameter of steel rods weight is 18.96 kgs.

**Unit weight of steel 20mm**

Unit weight of 20mm dia of steel bars or rods is around 2.47kg per meter which is approximately equal as 0.752 kg per foot. One piece of 12 meter (40 ft) length of 20 mm diameter of steel rods weight is 29.62 kgs.

**Unit weight of steel as per IS code**

As per IS code and Indian standard the unit weight of structural steel is taken as 7850 kg/m3 or 78.50 kN/m3 or 7.85 g/cm3 or 490 lbs/ft3 or 13,231 lbs/yd3.

**Conclusions**:-

The unit weight of the structural steel bars or rod is assumed to be 7,850 kg/m3, 78.50 kN/m3, 7.85 g/cm^3, 490 lbs/ft^3 or 13,231 lbs/yd^3.