TMT Bar Weight Calculator
TMT bar weight per metre = d² / 162, where d is the diameter in mm. A 12 mm bar weighs 0.889 kg per metre and 10.67 kg per 12 m length. Use the calculator to convert bars to kilograms or tonnes to bar count before you order steel.
Bars to weight
Weight per metre0.889 kg
Weight per bar10.67 kg
Total for 10 bars106.7 kg
Weight to bars
Uses the diameter and bar length selected on the left.
12 mm bars of 12 m in 1 t93 bars
Total length1125 m
TMT bar weight chart
| Diameter | Weight per metre | Weight per 12 m bar | Bars per tonne (12 m) | Typical use |
|---|---|---|---|---|
| 6 mm | 0.222 kg | 2.67 kg | 375 | Stirrups, ties, lintels |
| 8 mm | 0.395 kg | 4.74 kg | 210 | Stirrups, slab distribution steel |
| 10 mm | 0.617 kg | 7.41 kg | 135 | Slabs, lintels, stair waist |
| 12 mm | 0.889 kg | 10.67 kg | 93 | Slabs, beams, small columns |
| 16 mm | 1.580 kg | 18.96 kg | 52 | Beams, columns, footings |
| 20 mm | 2.469 kg | 29.63 kg | 33 | Columns, heavy beams, footings |
| 25 mm | 3.858 kg | 46.30 kg | 21 | Main columns, raft foundations |
| 32 mm | 6.321 kg | 75.85 kg | 13 | Heavy structures, large spans |
How to order TMT steel without waste
- Take the bar bending schedule from your structural drawing. It lists each diameter and the total running metres.
- Convert metres to kilograms with the chart above, then add 3 to 5% for cutting and lap waste.
- Order in full 12 m bars by weight. Shorter lengths leave more offcuts.
- Stage deliveries by element: footings and columns first, then beams and slab, so steel does not sit on site and rust.
TKR Building Materials supplies ISI-marked Fe 500 and Fe 550D TMT from JSW and Tata Steel across Tenkasi district, billed by actual weight. See TMT bars and steel in Tenkasi or call +91 76676 66264 for today's rate per kg.
TMT Steel
Common Questions
A 12 mm TMT bar weighs 0.889 kg per metre, so a standard 12 m bar weighs about 10.67 kg. One tonne contains about 94 bars of 12 mm x 12 m.
Weight in kg per metre = d² / 162, where d is the bar diameter in millimetres. For example, 16 mm: 16 x 16 / 162 = 1.58 kg per metre.
An 8 mm bar weighs 0.395 kg per metre, or 4.74 kg per 12 m bar, so one tonne has about 211 bars. In practice, bundles are sold by weight, so the count varies slightly.
IS 1786 allows a rolling tolerance of about plus or minus 7% for 8 and 10 mm bars and plus or minus 5% for 12 mm and above. Branded TMT from JSW or Tata Steel stays close to nominal; we bill by actual weighed quantity.