Short answer: Bathroom scales are fine for small amounts if you weigh yourself holding the load and subtract your own weight, while heavier loads can be weighed in batches on a luggage or platform scale, and you should weigh each metal separately, cleaned of dirt and attachments, because a decent weight is the foundation of a decent estimate.
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List Free →Small loads
Weigh yourself, then yourself holding the scrap, and subtract.
Large loads
Weigh in batches and add them up, or use a platform scale.
Weigh clean
Remove attachments and shake off dirt, so you weigh what will be paid for.
How ScrapTrade Fits In
ScrapTrade offers use transparent weighing, so your own weight is a useful cross-check.
An estimate makes you a harder person to underpay. ScrapTrade shows current prices and connects you with verified buyers, transparent weighing and escrow-protected payments.
List or Find Scrap on ScrapTrade →Practical answers on estimating the value of a scrap load from weight, metal type and realistic deductions.