TMT bar weight chart
The weight of a TMT bar in kg per metre is its diameter in millimetres squared, divided by 162. A 12 mm bar weighs 0.888 kg per metre, which is 10.66 kg for a standard 12 metre bar.
Weight per metre, per bar and bars per tonne
| Diameter | Weight per metre | Weight per 12 m bar | Bars per tonne, approx. |
|---|---|---|---|
| 8 mm | 0.395 kg | 4.74 kg | 211 |
| 10 mm | 0.617 kg | 7.40 kg | 135 |
| 12 mm | 0.888 kg | 10.66 kg | 94 |
| 16 mm | 1.58 kg | 18.96 kg | 53 |
| 20 mm | 2.47 kg | 29.64 kg | 34 |
| 25 mm | 3.85 kg | 46.20 kg | 22 |
| 32 mm | 6.31 kg | 75.72 kg | 13 |
The formula
Weight in kg = (D x D / 162) x length in metres, where D is the diameter in mm.
Example: 40 bars of 16 mm, each 12 metres long. 16 x 16 / 162 = 1.58 kg per metre. 1.58 x 12 x 40 = 758 kg.
Why actual weight differs slightly
IS 1786 allows a batch to vary from the standard weight by 7 percent for bars up to 10 mm, 5 percent for bars over 10 mm and up to 16 mm, and 3 percent above 16 mm. TMT is sold by weight, so you pay for the weight delivered.
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WhatsApp us nowFrequently asked questions
What is the formula for TMT bar weight?
The weight of a TMT bar in kg per metre is the diameter in mm squared, divided by 162. Multiply by the length in metres for the weight of the bar.
How many 12 mm TMT bars are there in one tonne?
A 12 metre long 12 mm TMT bar weighs 10.66 kg, so one tonne holds about 94 bars.
What is the weight of an 8 mm TMT bar?
An 8 mm TMT bar weighs 0.395 kg per metre, which is 4.74 kg for a standard 12 metre bar.
What is the weight of a 16 mm TMT bar?
A 16 mm TMT bar weighs 1.58 kg per metre, which is 18.96 kg for a standard 12 metre bar.