Steel Coil Weight Calculator
Carbon steel - cold rolled (CR) and hot rolled (HR) - is the most common coil material in Indian service centers, with a density of 7.85 g/cm³. HR coils typically run heavier gauges and larger ODs than CR, so weights of 20–30 tonnes are routine on HR lines.
This is an interactive calculator; enable JavaScript to use it. Enter coil OD, ID and width to get weight in kg/tonnes, plus strip length if thickness is given.
Typical Steel Coil Specifications
| Density | 7.85 g/cm³ (CR, HR and MS) |
| Common thickness | CR: 0.10–3mm · HR: 1.5–12mm |
| Common coil ID | 508mm (20") or 610mm (24") |
| Typical coil weight | 5–30 tonnes |
Example: an HR coil with 1800mm OD, 610mm ID and 1500mm width weighs about π/4 × (1800² − 610²) × 1500 × 7.85 × 10⁻⁶ ≈ 26.5 tonnes.
Coil Weight Formula
Weight (kg) = π/4 × (OD² − ID²) × Width × Density × 10⁻⁶ - with OD, ID and Width in millimetres and density in g/cm³.
Frequently Asked Questions
How much does a standard MS steel coil weigh?
Most mild steel coils in India weigh between 5 and 25 tonnes. A common CR coil (1250mm wide, 1500mm OD, 508mm ID) is about 15.3 tonnes; heavy HR coils can reach 30+ tonnes.
Is the weight formula different for HR and CR steel?
No - both use density 7.85 g/cm³, so the same formula applies. HR coils are simply thicker gauge and often wider/larger OD, which is why they weigh more.