Establish the measurement and quote basis
Use a scale suitable for the expected mass, tare the collection container and weigh a counted representative sample. Record conditioning and which components are included.
Record the SKU, date, source document and unit beside the observation. Mark an estimate as provisional so it cannot be mistaken for supplier-confirmed data.
Worked purchasing example
A tared sample of 100 empty containers weighs 2,480 g. Average mass is 24.8 g/container. At EUR 1.60/kg the resin-only allocation is EUR 0.03968/container.
These figures are illustrative arithmetic, not market prices or a promised saving. Replace them with measurements and offers covering your actual job.
Turn the result into a decision
Use separate samples for different SKUs or production lots. A sample average estimates consumption; it does not prove that every piece meets a tolerance.
Use the linked calculator to check the same boundary, then include complete known order charges in comparison. Preserve unresolved items in the specification rather than replacing them with zero.
Common questions
Should lids and labels be included?
Include them only if they belong to the stated mass boundary. For resin cost of the container body, weigh the body separately; for complete-system reduction, include all relevant components.
Are the example prices current supplier quotes?
No. They are illustrative values chosen to demonstrate the calculation. Enter current confirmed offers for the same specification and quantity.