Carrier cost calculator
Brief & Field — free working tool
https://briefandfield.com/library/carrier-cost/

Basket and comparison basis
Which closed period, shipment IDs, currency, tax basis and horizon are being compared?

Your notes:

Essential service conditions
Which conditions must both options satisfy? Mark failures and unresolved requirements.

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Contracts and price rules
Record offer versions and the source of rates, bands, surcharge bases and relevant service fees.

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Cost table
For each line, record quantity × rate, evidence and whether it is invoiced, modelled, estimated or unknown.

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Handling, exceptions and switching
What work changes, who confirms it, and is it cash cost, allocated time or an unresolved effect?

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Threshold and missing facts
Which additional net cost or mix change reverses the ranking? What should be checked first?

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Recommendation and follow-up
Which action is justified now? Who resolves open questions and checks the actual result?

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Sources
https://www.gov.uk/guidance/the-aqua-book
https://www.dopravio.sk/

Original B&F worksheet: CC BY 4.0. Linked publications retain their own terms.