Steel Coil Calculate

Coil Calculator (Length, Weight & OD)

Estimate coil length from weight, or coil weight from length, and calculate outer diameter (OD) using a practical annulus approximation. Designed for purchasing, slitting/recoiling planning, and logistics checks—optimized for desktop, tablet, and mobile.

Mode A: Weight → Length (+ OD)

Mode B: Length → Weight (+ OD)

Inputs

Material (preset density)

Density (kg/m³)

Thickness (mm)

Width (mm)

Inner Diameter ID (mm)

OD gap factor (optional, %)

Coil weight (tons)

Coil weight (kg)

OD is estimated using an annulus approximation. It ignores interwrap gaps, edge crown, and packing variation. For lifting, coil ID/OD fit, and container blocking, confirm with mill packing drawings and your handling spec.

Results

Coil length

—

Coil weight

—

Outer Diameter (OD)

—

Strip unit weight

—

Mode A active

Why Coil Calculations Matter

Coil purchasing is almost always quoted by weight, while production and logistics often need length and diameter. Accurate estimates help you compare offers, plan slitting yields, schedule recoiling, and confirm container loading and lifting limits.

Procurement: translate “tons” into usable length for downstream planning.
Logistics: check OD/ID constraints for pallets, saddles, and container bracing.
Processing: estimate meters per ton for cost breakdown and yield tracking.

Common Formulas Used

The calculator is based on two practical relationships:
1) Weight (kg) = Thickness × Width × Length × Density
2) OD estimate uses annulus volume: Volume = (π/4) × (OD² − ID²) × Width

Practical Examples

Example A (Weight → Length): Carbon steel coil, 2.5 mm × 1000 mm, 12 tons. The calculator returns an estimated length and OD for a given ID (e.g., 508 mm).

Example B (Length → Weight): Duplex 2205 coil, 2.0 mm × 1500 mm, 800 m. You can estimate total weight for quotation and shipping planning.

Sample Coil Weight Table (Reference)

Thickness (mm)	Width (mm)	Length (m)	Density (kg/m³)	Estimated Weight (tons)
0.5	1000	2000	7930	7.93
1.0	1250	1000	7930	9.91
2.0	1500	800	7800	18.72

These are reference examples for estimating only. Actual coil weight may vary by tolerance, edge condition, and mill practice.

FAQ

Q1: What if my alloy is not listed?
A: Select any material, then directly overwrite the density value.

Q2: How accurate is OD?
A: OD is an estimate using a practical annulus approximation. For strict handling fit-up, confirm with packing drawings.

Q3: Can this support stainless and carbon coils?
A: Yes. It includes common densities and accepts custom density values.