This aluminum coil weight calculator also works for steel, copper and zinc. Enter the metal, gauge and width, then either the coil weight or the length you need. The calculator returns the other value and the weight per linear foot.
Coil weight & length
- Result
- Fill in the fields to see the result.
Estimate based on nominal thickness and the values above. Confirm with us before ordering.
The formula
- Weight per linear foot (lb) = width (in) × thickness (in) × 12 × density (lb per cubic inch).
- Linear feet = coil weight ÷ weight per linear foot.
- Coil weight = linear feet × weight per linear foot.
The densities are 0.0975 for aluminum, 0.2836 for steel, 0.323 for copper and 0.258 for zinc.
Worked examples
- 24″ × .032″ aluminum: 24 × 0.032 × 12 × 0.0975 = 0.90 lb per foot, or about 1.11 feet per pound. A 500 lb coil holds about 556 linear feet.
- 20″ × .032″ aluminum: 20 × 0.032 × 12 × 0.0975 = 0.75 lb per foot.
- 24″ × 24 ga steel: at a nominal 0.0239″, 24 × 0.0239 × 12 × 0.2836 = 1.95 lb per foot.
Why a real coil differs a little
- Mills roll to a tolerance, so actual thickness varies slightly from nominal.
- Paint and metallic coatings add a small amount of weight.
- The coil tag shows the real weight of that coil. Use it when you can.
For ordering, the calculator is close enough to plan. For a takeoff on a large job, send us the numbers and we’ll check them.
Questions
Why doesn’t my coil tag match the calculator exactly?
Thickness tolerance and coating weight. The tag weight is the real one.
How do I enter copper sold by the ounce?
Copper is often sold by ounces per square foot. 16 oz copper is about 0.0216″ thick and 20 oz is about 0.027″. Enter that thickness with the copper setting.
Does this work for trim coil rolls?
Yes. Enter the roll width and gauge, and the length or the weight.
Can I add the result to my quote?
Yes. The button under the result adds the metal, gauge, width and quantity to your quote list.
Next steps: see how many panels a coil makes with the panels-per-coil calculator, or browse aluminum and steel coil. All tools are on the calculators page.