Coil weight calculator weight and strip length of any coil.
Coil weight (kg) = π/4 × (OD² − ID²) × width × density. A 1,250 mm wide mild steel coil with a 508 mm ID and a 1,200 mm OD weighs about 9.11 tonnes, and at 1.0 mm thick it holds about 928 m of strip. Enter your coil below for any size and metal.
Theoretical weight from nominal size and density. Actual weight varies within mill tolerances.
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Steel coil weight chart by outside diameter
Mild steel at 7.85 g/cm³. Weight per mm of width for 508 mm (20") and 610 mm (24") inside diameters, and full coil weight in tonnes on a 508 mm ID. For stainless steel multiply by 1.01; for aluminium by 0.344.
| Coil OD | kg per mm width, 508 ID | kg per mm width, 610 ID | 1,000 mm wide, t | 1,250 mm wide, t | 1,500 mm wide, t |
|---|---|---|---|---|---|
| 800 mm | 2.35 | 1.65 | 2.35 | 2.94 | 3.53 |
| 900 mm | 3.40 | 2.70 | 3.40 | 4.25 | 5.10 |
| 1,000 mm | 4.57 | 3.87 | 4.57 | 5.72 | 6.86 |
| 1,100 mm | 5.87 | 5.17 | 5.87 | 7.34 | 8.80 |
| 1,200 mm | 7.29 | 6.58 | 7.29 | 9.11 | 10.93 |
| 1,300 mm | 8.83 | 8.13 | 8.83 | 11.04 | 13.24 |
| 1,400 mm | 10.49 | 9.79 | 10.49 | 13.12 | 15.74 |
| 1,500 mm | 12.28 | 11.58 | 12.28 | 15.35 | 18.42 |
| 1,600 mm | 14.19 | 13.49 | 14.19 | 17.74 | 21.29 |
| 1,800 mm | 18.38 | 17.68 | 18.38 | 22.98 | 27.58 |
| 2,000 mm | 23.07 | 22.37 | 23.07 | 28.84 | 34.61 |
Coil length per tonne by thickness
Metres of strip in one tonne of coil: length (m) = 1,000 ÷ (width (m) × thickness (mm) × density). Multiply by the coil weight in tonnes for the full length.
| Thickness | MS, 1,000 mm wide, m/t | MS, 1,250 mm wide, m/t | MS, 1,500 mm wide, m/t | SS 304, 1,250 mm wide, m/t |
|---|---|---|---|---|
| 0.4 mm | 318.5 | 254.8 | 212.3 | 252.2 |
| 0.5 mm | 254.8 | 203.8 | 169.9 | 201.8 |
| 0.6 mm | 212.3 | 169.9 | 141.5 | 168.1 |
| 0.8 mm | 159.2 | 127.4 | 106.2 | 126.1 |
| 1 mm | 127.4 | 101.9 | 84.9 | 100.9 |
| 1.2 mm | 106.2 | 84.9 | 70.8 | 84.1 |
| 1.5 mm | 84.9 | 67.9 | 56.6 | 67.3 |
| 1.6 mm | 79.6 | 63.7 | 53.1 | 63.1 |
| 2 mm | 63.7 | 51.0 | 42.5 | 50.4 |
| 2.5 mm | 51.0 | 40.8 | 34.0 | 40.4 |
| 3 mm | 42.5 | 34.0 | 28.3 | 33.6 |
| 4 mm | 31.8 | 25.5 | 21.2 | 25.2 |
| 5 mm | 25.5 | 20.4 | 17.0 | 20.2 |
| 6 mm | 21.2 | 17.0 | 14.2 | 16.8 |
Coil formulas
- Coil weight: W (kg) = π/4 × (OD² − ID²) × width × density, all in metres and kg/m³.
- Coil length: L (m) = W ÷ (width (m) × thickness (mm) × density (g/cm³)), or π/4 × (OD² − ID²) ÷ thickness.
- Coil OD from weight: OD = √(ID² + 4W ÷ (π × width × density)).
- Slit coil weight: mother coil weight × slit width ÷ mother coil width.
For flat sheets and plates cut from the coil, use the MS plate weight calculator or the SS sheet weight calculator; for gauge sizes see the SWG to mm chart.
Reference basis: Compiled by Steel Impex India. Check each table’s source, product form and delivery condition before use. Sources, calculation methods and corrections.
Frequently asked questions
How do you calculate the weight of a steel coil?
Weight (kg) = π/4 × (OD² − ID²) × width × density, with OD, ID and width in metres and density in kg/m³ (7,850 for mild steel, 7,930 for SS 304, 2,700 for aluminium). A 1,200 mm OD, 508 mm ID, 1,250 mm wide MS coil weighs about 9,109 kg.
How do you calculate the length of a coil?
Length (m) = coil weight (kg) ÷ (width (m) × thickness (mm) × density (g/cm³)). For example, a 9,109 kg MS coil 1,250 mm wide and 1.0 mm thick holds 9,109 ÷ (1.25 × 1.0 × 7.85) = 928 m of strip.
How do you find the outside diameter of a coil from its weight?
OD = √(ID² + 4 × weight ÷ (π × width × density)). A 5 tonne, 1,250 mm wide MS coil on a 508 mm ID is about 952 mm OD.
What are the standard inside diameters of steel coils?
Hot rolled and cold rolled coils are usually wound on a 508 mm (20") or 610 mm (24") ID, and some lines use 762 mm (30"). Slit coils and narrow strip often use 406 mm or 508 mm.
What is the weight of a coil per mm of width?
Divide the coil weight by its width in mm. A 1,200 mm OD MS coil on a 508 mm ID weighs about 7.29 kg per mm of width, so a 100 mm slit from it weighs about 729 kg.
Does calculated coil weight include the core and packing?
The metal calculation estimates material mass from the selected geometry and density. Core, wrapping, pallets and other packaging must be added separately when planning gross transport weight.
Can I share a calculation for several pieces?
Yes. Use Copy calculation link after checking dimensions, density and a whole-number quantity. The link preserves those inputs but excludes your price. Calculated mass is an estimate; confirm commercial weight and packing separately.