Establish the measurement and quote basis
Use one explicit demand period and compare purchase tiers, delivery fees, storage and potential obsolete stock. Do not mix a single large-order quote with a monthly delivery fee.
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
For 12,000 packs, one EUR 300 delivery versus four EUR 100 deliveries changes freight from EUR 300 to EUR 400. A EUR 0.01/pack price reduction saves EUR 120, but a EUR 150 extra holding charge reverses that saving.
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
Separate ordered quantity from consumed quantity and retain any final surplus. A lower unit quote can increase period cash cost if it forces unneeded inventory.
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 the comparison always cover a year?
No. Use the same real evaluation period for both scenarios. State the number of shipments and demand rather than assuming one delivery per month.
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.