Steel Calculator
Get the weight of reinforcement steel from bar diameter, length and count, using the standard d²⁄162 formula.
How the steel calculator works
The weight of a round TMT bar comes from a simple, widely used formula:
- Unit weight (kg/m) = d² ÷ 162, where d is the diameter in mm
- Total weight = unit weight × length per bar × number of bars
Unit weight by bar diameter
| Diameter | Weight (kg/m) |
|---|
| 8 mm | 0.395 |
| 10 mm | 0.617 |
| 12 mm | 0.888 |
| 16 mm | 1.580 |
| 20 mm | 2.470 |
| 25 mm | 3.850 |
Thumb-rule for a full RCC house: about 4–5 kg of steel per sq ft of built-up area. Use a bar bending schedule for exact quantities.
Steel calculator FAQ
What is the weight of a 12 mm steel bar?›
About 0.888 kg per metre (12² ÷ 162), so a 12 m bar weighs roughly 10.66 kg.
What is the d²/162 formula?›
It gives a round steel bar's weight per metre, where d is the diameter in mm. It comes from steel's density and the bar's cross-section.
How much steel does a house need?›
Roughly 4–5 kg per sq ft of built-up area for a typical low-rise RCC home — more for heavier or taller structures.