3mm aluminium sheet price refers to the price for aluminium sheets of 3mm thick. The requirement seems to be clear, but it turns out to be a little vague, for the aluminium sheet is divided into so many alloys whose price entail varied manufacturing costs. Simply speaking, the sheet has eight regular series, each of which comprises around ten alloys. There is classification based on different thickness scopes as well. The ones between 0.15mm and 2.0mm thick is regarded as thin sheets, 2.0mm and 6.0mm regular sheets, 6.0 and 25.0mm medium sheets, and 25mm above thick sheets. 3mm aluminium sheet belongs to the regular type.
The aluminium sheet price is based on weight. A square of 3mm sheet weighs about 8.13kg (obtained by multiplying 3 and 2.71, the density of aluminium). The eventual price contains costs for aluminium ingots and manufacturing processes. You can get aluminium ingot price from the internet, but the manufacturing cost varies from supplier to supplier, and you have to contact your supplier for a specific answer.
A better way is to give your usage of the sheet, and your supplier will recommend the most suitable alloy and the most cost effective 3mm aluminium sheet price. Good luck with your purchase!