1. Using a scale: The most straightforward way to measure the weight of an aluminum coil is to use a scale. You will need a scale that can handle the weight of the coil. Place the coil on the scale and record the weight displayed on the scale.
2. Using a formula: If you know the dimensions of the coil (length, width, and thickness), you can use a formula to calculate the weight. The formula for calculating the weight of a rectangular object is:

Weight (in pounds) = Length (inches) x Width (inches) x Thickness (inches) x Density (in pounds per cubic inch)

The density of aluminum is 0.098 pounds per cubic inch. So, for example, if your coil is 10 inches long, 5 inches wide, and 0.25 inches thick, the calculation would be:

Weight = 10 x 5 x 0.25 x 0.098 = 12.25 pounds

3. Using a tape measure and chart: If you don’t have a scale or the dimensions of the coil, you can use a tape measure and a weight chart to estimate the weight. Measure the circumference and the width of the coil with a tape measure. Then use a weight chart for the specific type of aluminum coil you have to estimate the weight based on those measurements. Keep in mind that this method will only give an estimate and may not be as accurate as the other methods.