Question 1

How do you calculate steel coil weight?

Accepted Answer

Steel coil weight is calculated using the formula: Weight (kg) = Thickness (mm) x Width (mm) x Length (m) x Density (g/cm3) / 1000. For carbon steel, galvanized steel, and PPGI, the density is 7.85 g/cm3. For stainless steel 304, use 7.93 g/cm3. For example, a 0.5mm thick, 1250mm wide, 1000m long galvanized steel coil weighs: 0.5 x 1250 x 1000 x 7.85 / 1000 = 4,906 kg (approximately 4.9 tons).

Question 2

How many tons of steel coils fit in a 20ft container?

Accepted Answer

A standard 20ft container can hold approximately 25-28 metric tons of steel coils, depending on coil dimensions and loading method (eye-to-sky or eye-to-side). The maximum payload of a 20ft container is about 25 tons (with some carriers allowing up to 28 tons). The actual number of coils depends on individual coil weight and outer diameter. A 40ft container can hold approximately 26-28 tons due to weight distribution limits.

Question 3

What is the density of galvanized steel?

Accepted Answer

The density of galvanized steel is approximately 7.85 g/cm3 (7,850 kg/m3), which is the same as the base carbon steel substrate. The thin zinc coating (typically 7-20 micrometers per side) adds negligible weight to the overall density calculation. This density value is used for weight calculations of GI coils, galvanized sheets, and related products including DX51D+Z, SGCC, and A653 grade materials.

Question 4

How do you calculate coil length from weight?

Accepted Answer

To calculate coil length from known weight, use the reverse formula: Length (m) = Weight (kg) x 1000 / (Thickness (mm) x Width (mm) x Density (g/cm3)). For example, if a carbon steel coil weighs 5,000 kg, is 0.8mm thick and 1250mm wide: Length = 5000 x 1000 / (0.8 x 1250 x 7.85) = 636.9 meters. This calculator supports both weight-to-length and length-to-weight conversions.

Question 5

What is the difference in density between carbon steel and stainless steel?

Accepted Answer

Carbon steel has a density of 7.85 g/cm3, while stainless steel density varies by grade: 304/304L is 7.93 g/cm3, 316/316L is 7.98 g/cm3, and 430 is 7.75 g/cm3. The difference is small (1-2%) but becomes significant for large orders. For example, a 10-ton order of 304 stainless steel coil would be about 1% heavier than the same dimensions in carbon steel, affecting shipping costs and container loading calculations.

Thickness	Width	Wt / Meter	Coil (1000m)
0.18 mm	1000 mm	1.41 kg/m	1.41 t
0.20 mm	1000 mm	1.57 kg/m	1.57 t
0.30 mm	1000 mm	2.36 kg/m	2.36 t
0.40 mm	1219 mm	3.83 kg/m	3.83 t
0.50 mm	1219 mm	4.78 kg/m	4.78 t
0.50 mm	1250 mm	4.91 kg/m	4.91 t
0.80 mm	1250 mm	7.85 kg/m	7.85 t
1.00 mm	1250 mm	9.81 kg/m	9.81 t
1.20 mm	1250 mm	11.78 kg/m	11.78 t
1.50 mm	1500 mm	17.66 kg/m	17.66 t
2.00 mm	1500 mm	23.55 kg/m	23.55 t

Material	Density	Common Grades	Applications
Carbon Steel	7.85	Q235, Q345, SS400, A36, S235JR	Construction, machinery, pipelines
Galvanized Steel	7.85	DX51D+Z, SGCC, A653 CS-B	Roofing, HVAC, automotive
PPGI / PPGL	7.85	DX51D+Z with PE/SMP/PVDF	Roofing, wall panels, appliances
Stainless 304	7.93	304, 304L, 1.4301, SUS304	Food equipment, chemical tanks
Stainless 316	7.98	316, 316L, 1.4401, SUS316	Marine, pharma, oil & gas
Stainless 430	7.75	430, 1.4016, SUS430	Kitchen sinks, auto trim
Silicon Steel	7.85	B50A800, 50W800, M800-50A	Transformers, motors
Tinplate	7.85	T1-T5, DR7-DR9, MR, TFS	Food cans, aerosol containers
Aluminum (1/3/5)	2.71	1050, 1060, 3003, 3105, 5052	Packaging, roofing, marine
Aluminum (6/7)	2.81	6061, 6063, 7075	Structural, aerospace
Copper	8.96	C11000, C12200	Electrical, plumbing

Steel Coil Weight Calculator

Quick Reference: Common Galvanized Steel Coil Weights

Steel Density Reference Table

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Steel Coil Weight Calculator

Quick Reference: Common Galvanized Steel Coil Weights

Steel Density Reference Table

Need Steel Coils at Competitive Prices?

More Free Steel Tools

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