Table of Contents
Steel bar or TMT bars are ordered in tons, pieces, and bundles of bars, thus knowing the unit weight of steel bar for different dia of bar per unit length is important for construction. Having an idea of TMT bar weight chart with the number of bars per bundle is important for ordering the quantity of steel in bundles.
Different structural members required different amounts of steel thus suitable steel bars of appropriate dia bars are selected for the slab, beams, columns, and other structural members. For instance, the slab requires 10 mm or 12 mm steel bars as main bars and 8 mm or 10 mm for distribution bars. For beams 12 mm or 16 mm bars are used, thus according to the span or member the dia of bar changes.
All individuals associated with construction or civil engineering need to have a clear idea about the steel bar weight of different dia of steel and also the number of bars in a bundle and the weight of the bar per meter length.
Unit Weight of Steel Bars
The unit weight of steel bars per unit length is very important to calculate the quantity of steel for giving orders. The unit weight of steel is known thus we can calculate the unit weight of TMT bars per meter length and per feet length of bars.
Steel Bar Unit Weight Calculator
| Diameter | Unit Weight per Meter (kg) | Weight of 1 Bar (kg) | Number of bars in Bundle | Weight of bundle of bar (kg) | No. of bars in a Ton | Number of bundles in a Ton |
|---|---|---|---|---|---|---|
| 5.5 mm | 0.186 kg | 2.24 kg | 20 | 45 kg | 446 | 22 |
The specific weight of steel or unit weight of steel is 7850 kg/m3 or 78.5 kN/m3 or 490 lbs/ft3. Thus by knowing the unit weight of reinforcing steel we can calculate the unit weight of rod per unit length of steel bars for different dia of steel.
Unit weight of Steel bars = volume* density
Therefore Weight = cross-sectional area* length* density
W = [π/4 * (diameter of bar)2] * length of bar * density of steel.
We know that,
the value of π = 3.14,
The density of steel is 7850 kg/m3, or 78.5 kN/m3 or 490 lbs/ft3
‘D’ Diameter of bar is measured in ‘mm’,
‘L’ Length of bar is measured in ‘meter’
Therefore, the Formula for the unit weight of steel bar per unit length is
W = [3.14 D2/ (4*1000*1000)] * length * 7850
W = D2 * L * 0.00616225
W = D2 * L/162 Kg/m …(unit weight of steel bar in kilogram per meter length)
or
W = D2 * L/533 Kg/ft …(unit weight of steel bar in kilogram per feet length)
| Diameter of bar (mm) | Unit weight of steel per meter length | Unit weight of steel per feet length |
|---|---|---|
| 5.5 mm | 0.186 kg | 0.057 kg |
| 6 mm | 0.222 kg | 0.068 kg |
| 8 mm | 0.395 kg | 0.120 kg |
| 10 mm | 0.617 kg | 0.188 kg |
| 12 mm | 0.889 kg | 0.270 kg |
| 16 mm | 1.58 kg | 0.480 kg |
| 20 mm | 2.47 kg | 0.750 kg |
| 25 mm | 3.86 kg | 1.173 kg |
| 28 mm | 4.84 kg | 1.471 kg |
| 32 mm | 6.32 kg | 1.921 kg |
| 40 mm | 9.88 kg | 3.002 kg |
Steel Bar Weight, Numbers in a Bundle
Unit weight of bar for different dia of steel with a weight of 1 bar and number of bars in a bundle is important for construction-related work. The number of bars in a ton of steel for a specific dia of steel and the number of bundles in a ton are shown below.
The length of each bar is 12 meters or 40 feet in length.
| Diameter of bar (mm) | Unit weight of steel per meter length | Weight of 1 Bar | Number of bars in Bundle | Weight of bundle of bar | No. of bars in a Ton | Number of bundles in a ton |
|---|---|---|---|---|---|---|
| 5.5 mm | 0.186 kg | 2.24 kg | 20 | 45 | 446 | 22 |
| 6 mm | 0.222 kg | 2.67 kg | 20 | 53 | 375 | 19 |
| 8 mm | 0.395 kg | 4.74 kg | 10 | 47 | 211 | 21 |
| 10 mm | 0.617 kg | 7.41 kg | 7 | 52 | 135 | 19 |
| 12 mm | 0.889 kg | 10.67 kg | 5 | 53 | 94 | 19 |
| 16 mm | 1.58 kg | 18.96 kg | 3 | 57 | 53 | 18 |
| 20 mm | 2.47 kg | 29.63 kg | 2 | 59 | 34 | 17 |
| 25 mm | 3.86 kg | 46.30 kg | 1 | 46 | 22 | 22 |
| 28 mm | 4.84 kg | 58.07 kg | 1 | 58 | 17 | 17 |
| 32 mm | 6.32 kg | 75.85 kg | 1 | 76 | 13 | 13 |
| 40 mm | 9.88 kg | 118.52 kg | 1 | 119 | 8 | 8 |
How Many Steel Bars in One Bundle of Steel
The number of bars in a bundle of steel bars is shown in the table given below.
| Bar Dimension (mm) | Number of bars in Bundle |
|---|---|
| 5.5 mm | 20 |
| 6 mm | 20 |
| 8 mm | 10 |
| 10 mm | 7 |
| 12 mm | 5 |
| 16 mm | 3 |
| 20 mm | 2 |
| 25 mm | 1 |
| 28 mm | 1 |
| 32 mm | 1 |
| 40 mm | 1 |
Unit Weight of Steel For Different Bars
Detailed information about different dia of steel bars with its unit weight and weight per meter length is shown below. The number of bars in a bundle and the weight of each bundle and other useful information are also given for each bar.
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Unit Weight of 5.5 mm Steel Bar
The weight of 1 tmt bar of 5.5 mm dia bar can be calculated using the formula,
Weight of bar per meter length = D2/162.
Thus Weight of 5.5 mm dia bar = (5.5)2/162
Weight per meter length = 0.186 kg
For unit weight of 5.5 mm dia bar per feet length W = D2/533
Weight per feet length = 0.057 kg
Thus weight of 1 TMT bar of 5.5 mm dia TMT bar of 12 meter length is 2.24 kg.
A bundle of 5.5 mm consists of 20 bars and weight of bundle is 45 kg per bundle.
1 Ton of 5.5 mm bars will have approximately 446 number of bars or have 22 bundles in a ton.
Steel bar of 5.5 mm dia bar weight around 0.186 kg per meter length and weight of around 0.057 kg per feet length.
Thus the weight of 5.5 mm dia TMT bar is 2.24 kg for 12 meter length of the bar.
Unit Weight of 6 mm Steel Bar
The weight of 1 TMT bar of 6 mm dia bar can be calculated using the formula,
Weight of bar per meter length = D2/162.
Thus Weight of 6 mm dia bar = (6 mm)2/162
Weight per meter length = 0.222 kg
For unit weight of 6 mm dia bar per feet length W = D2/533
Weight per feet length = 0.068 kg
Thus weight of 1 tmt bar of 6 mm dia TMT bar of 12 meter length is 2.67 kg.
A bundle of 6 mm consists of 20 bars and the weight of bundle is 53 kg per bundle.
1 Ton of 6 mm bars will have approximately 375 number of bars or have 19 bundles in a ton.
Steel bar of 6 mm dia bar weight around 0.222 kg per meter length and weight around 0.068 kg per feet length.
Thus the weight of 6 mm dia TMT bar is 2.67 kg for 12 meter length of bar.
Unit Weight of 8 mm Steel Bar
The weight of 1 TMT bar of 8 mm dia bar can be calculated using the formula,
Weight of bar per meter length = D2/162.
Thus Weight of 8 mm dia bar = (8 mm)2/162
Weight per meter length = 0.395 kg
For unit weight of 8 mm dia bar per feet length W = D2/533
Weight per feet length = 0.120 kg
Thus weight of 1 TMT bar of 8 mm dia TMT bar of 12 meter length is 4.74 kg.
A bundle of 8 mm consists of 10 bars and weight of bundle is 47 kg per bundle.
1 Ton of 8 mm bars will have approximately 211 number of bars or 21 bundles in a ton.
Steel bar of 8 mm dia bar weighs around 0.395 kg per meter in length and around 0.120 kg per foot in length.
Thus the weight of 8 mm dia TMT bar is 4.74 kg for 12 meter length of bar.
Unit Weight of 10 mm Steel Bar
The weight of 1 TMT bar of 10 mm dia bar can be calculated using the formula,
Weight of bar per meter length = D2/162.
Thus Weight of 10 mm dia bar = (10 mm)2/162
Weight per meter length = 0.617 kg
For unit weight of 10 mm dia bar per feet length W = D2/533
Weight per feet length = 0.188 kg
Thus weight of 1 TMT bar of 10 mm dia TMT bar of 12 meter length is 7.41 kg.
A bundle of 10 mm consists of 7 bars and weight of bundle is 52 kg per bundle.
1 Ton of 10 mm bars will have approximately 135 number of bars or have 19 bundles in a ton.
Steel bar of 10 mm dia bar weigh around 0.617 kg per meter in length and around 0.188 kg per foot length.
Thus weight of 10 mm dia TMT bar is 7.41 kg for 12-meter length of bar.
Unit Weight of 12 mm Steel Bar
The weight of 1 TMT bar of 12 mm dia bar can be calculated using the formula,
Weight of bar per meter length = D2/162.
Thus Weight of 12 mm dia bar = (12 mm)2/162
Weight per meter length = 0.889 kg
For unit weight of 12 mm dia bar per feet length W = D2/533
Weight per feet length = 0.270 kg
Thus weight of 1 tmt bar of 12 mm dia TMT bar of 12 meter length is 10.67 kg.
A bundle of 12 mm consists of 5 bars and weight of bundle is 53 kg per bundle.
1 Ton of 12 mm bars will have approximately 94 bars or 19 bundles in a ton.
Steel bar of 12 mm dia bar weight around 0.889 kg per meter length and weight around 0.270 kg per feet length.
Thus weight of 12 mm dia TMT bar is 10.67 kg for 12 meter length of bar.
Unit Weight of 16 mm Steel Bar
Weight of 1 tmt bar of 16 mm dia bar can be calculated using the formula,
Weight of bar per meter length = D2/162.
Thus Weight of 16 mm dia bar = (16 mm)2/162
Weight per meter length = 1.58 kg
For unit weight of 16 mm dia bar per feet length W = D2/533
Weight per feet length = 0.480 kg
Thus weight of 1 TMT bar of 16 mm dia TMT bar of 12 meter length is 18.96 kg.
A bundle of 16 mm consists of 3 bars and the weight of bundle is 57 kg per bundle.
1 Ton of 16 mm bars will have approximately 53 bars or 18 bundles in a ton.
Steel bar of 16 mm dia bar weight around 1.58 kg per meter length and weight around 0.480 kg per feet length.
Thus weight of 16 mm dia TMT bar is 18.96 kg for 12 meter length of bar.
Unit Weight of 20 mm Steel Bar
Weight of 1 tmt bar of 20 mm dia bar can be calculated using the formula,
Weight of bar per meter length = D2/162
Thus Weight of 20 mm dia bar = (20 mm)2/162
Weight per meter length = 2.47 kg
For unit weight of 20 mm dia bar per feet length W = D2/533
Weight per feet length = 0.750 kg
Thus weight of 1 tmt bar of 20 mm dia TMT bar of 12 meter length is 29.63 kg.
A bundle of 20 mm consists of 2 bars and weight of bundle is 59 kg per bundle.
1 Ton of 20 mm bars will have approximately 34 number of bars or have 17 bundles in a ton.
Steel bar of 20 mm dia bar weight around 2.47 kg per meter length and weight around 0.750 kg per feet length.
Thus weight of 20 mm dia TMT bar is 29.63 kg for 12 meter length of bar.
Unit Weight of 25 mm Steel Bar
Weight of 1 tmt bar of 25 mm dia bar can be calculated using the formula,
Weight of bar per meter length = D2/162.
Thus Weight of 25 mm dia bar = (25 mm)2/162
Weight per meter length = 3.86 kg
For unit weight of 25 mm dia bar per feet length W = D2/533
Weight per feet length = 1.173 kg
Thus weight of 1 tmt bar of 25 mm dia TMT bar of 12 meter length is 46.30 kg.
A bundle of 25 mm consists of 1 bars and the weight of bundle is 46 kg per bundle.
1 Ton of 25 mm bars will have approximately 22 bars or have 22 bundles in a ton.
Steel bar of 25 mm dia bar weight around 3.86 kg per meter length and weight around 1.173 kg per feet length.
Thus weight of 25 mm dia TMT bar is 46.30 kg for 12 meter length of bar.
Unit Weight of 28 mm Steel Bar
Weight of 1 tmt bar of 28 mm dia bar can be calculated using the formula,
Weight of bar per meter length = D2/162
Thus Weight of 28 mm dia bar = (28 mm)2/162
Weight per meter length = 4.84 kg
For unit weight of 28 mm dia bar per feet length W = D2/533
Weight per feet length = 1.471 kg
Thus weight of 1 tmt bar of 28 mm dia TMT bar of 12 meter length is 58.07 kg.
A bundle of 28 mm consists of 1 bars and weight of bundle is 58 kg per bundle.
1 Ton of 28 mm bars will have approximately 17 bars or have 17 bundles in a ton.
Steel bar of 28 mm dia bar weight around 4.84 kg per meter length and weight around 1.471 kg per feet length.
Thus the weight of 28 mm dia TMT bar is 58.07 kg for 12 meter length of bar.
Unit Weight of 32 mm Steel Bar
Weight of 1 tmt bar of 32 mm dia bar can be calculated using the formula,
Weight of bar per meter length = D2/162
Thus Weight of 32 mm dia bar = (32 mm)2/162
Weight per meter length = 6.32 kg
For unit weight of 32 mm dia bar per feet length W = D2/533
Weight per feet length = 1.921 kg
Thus weight of 1 tmt bar of 32 mm dia TMT bar of 12 meter length is 75.85 kg.
A bundle of 32 mm consists of 1 bars and weight of bundle is 76 kg per bundle.
1 Ton of 32 mm bars will have approximately 13 number of bars or have 13 bundles in a ton.
Steel bar of 32 mm dia bar weight around 6.32 kg per meter length and weight around 1.921 kg per feet length.
Thus the weight of 32 mm dia TMT bar is 75.85 kg for 12 meter length of bar.
Unit Weight of 40 mm Steel Bar
Weight of 1 tmt bar of 40 mm dia bar can be calculated using the formula,
Weight of bar per meter length = D2/162.
Thus Weight of 40 mm dia bar = (40 mm)2/162
Weight per meter length = 9.88 kg
For unit weight of 40 mm dia bar per feet length W = D2/533
Weight per feet length = 3.002 kg
Thus weight of 1 tmt bar of 40 mm dia TMT bar of 12 meter length is 118.52 kg.
A bundle of 40 mm consists of 1 bars and weight of bundle is 119 kg per bundle.
1 Ton of 40 mm bars will have approximately 8 number of bars or have 8 bundles in a ton.
Steel bar of 40 mm dia bar weight around 9.88 kg per meter length and weight around 3.002 kg per feet length.
Thus weight of 40 mm dia TMT bar is 118.52 kg for 12 meter length of bar.
ISI Standard Unit Weight of Steel Bars
According to BIS Standard IS-1786 from Bureau of Indian Standards (BIS) steel bars of specific diameter should have following unit weight per meter as shown in the table.
| Bar Size in mm | ISI Standard (gm/mtr) |
|---|---|
| 6mm | 204 to 240 gm/mtr |
| 8mm | 367 to 422 gm/mtr |
| 10mm | 574 to 660 gm/mtr |
| 12mm | 844 to 932 gm/mtr |
| 16mm | 1501 to 1657 gm/mtr |
| 20mm | 2394 to 2544 gm/mtr |
| 25mm | 3735 to 3965 gm/mtr |
| 28mm | 4690 to 4980 gm/mtr |
| 32mm | 6127 to 6505 gm/mtr |
Variation and Tolerance in Steel
Steel bars used in construction should adhere to strict quality check and be consistent in quality. IS:1786-2008 specify certain tolerance range for specific dia of bars as shown in the table given below.
| Size of bars in mm | Batch Tolerance | Sample Tolerance |
|---|---|---|
| Up to and including 10 | ± 7 | -8 |
| Over 10 upto and including 16 | ± 5 | -6 |
| Over 16 | ± 3 | -4 |
Frequently Asked Questions on Unit Weight of Steel
What is the unit weight of steel?
The unit weight of steel refers to the weight of a specific volume of steel. Unit weight of steel is 7850 kg/m3 or 490 lb/ft3 or 78.5 KN/m3 or 7.85 g/cm3or 13231 lbs/yd3.
How is the unit weight of steel calculated?
The unit weight of steel can be calculated using the formula:
Unit Weight (kg/m³) = Mass (kg) / Volume (m³).
Steel weight formula = πD*2/ 4 × L × density or d2/192
What is the density of steel?
The density of steel varies depending on its composition. On average, the density of mild steel is around 7,850 kg/m³ (490 lb/ft³) or 78.5 KN/m3 or 7.85 g/cm3or 13231 lbs/yd3.
Does the unit weight of steel vary with different types of steel?
Yes, different types of steel alloys have different compositions, leading to varying densities and unit weights. For instance, stainless steel, carbon steel, and alloy steel will have different unit weights.
What are some common unit weights of different types of steel?
Mild Steel: Approximately 7,850 kg/m³ (490 lb/ft³).
Stainless Steel (304): Around 8,000 kg/m³ (500 lb/ft³).
Carbon Steel: Generally similar to mild steel, around 7,850 kg/m³ (490 lb/ft³).
Alloy Steel: Unit weight can vary depending on the specific alloy composition.
Why is knowing the unit weight of steel important?
It helps engineers and designers accurately calculate the weight of steel components, which is crucial for load-bearing calculations, structural design, and material estimation.
How is the unit weight of steel used in construction projects?
In construction, the unit weight of steel is used to determine the weight of structural members like beams, columns, and slabs. Unit weight of steel is important for ensuring the stability and safety of structures by ensuring that the materials used can withstand the anticipated loads.
What are the units used to express the unit weight of steel?
The unit weight of steel is typically expressed in kilograms per cubic meter (kg/m³) or pounds per cubic foot (lb/ft³), depending on the region and system of measurement.
How does temperature affect the unit weight of steel?
Temperature can have a slight effect on the density and, consequently, the unit weight of steel. As temperature changes, the volume of the steel may also change due to thermal expansion or contraction, leading to minor variations in unit weight.
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