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What did that price increase actually cost you?

Take one item from two invoices — the price then, the price now, and how much of it you buy. This turns the change into a monthly and annual dollar figure. Add an outside reference price if you have one, and it shows your gap against it.

Old price per unitPick ONE unit and use it everywhere — $/lb here means pounds below; $/case here means cases belowCurrent price per unitSame item, same unit, latest invoiceUnits per orderIn the SAME unit as your prices: 40 if you priced per lb and buy a 40 lb case — 1 if you priced per caseOrders per monthWeekly ≈ 4.33

Comparison price per unit (optional)Another supplier's quote, a cash-and-carry shelf price, or another operator's invoice — same spec and unit

What this tool can and can't tell you

Everything above is straight arithmetic on the numbers you typed — nothing is estimated and nothing is invented. What arithmetic on your own history cannot establish is whether a rise was a market move, a contract-permitted increase, or drift specific to your account. Distinguishing those takes an outside reference: another supplier's quote for the same spec, a cash-and-carry shelf price, or what other operators pay for the same case. That's the comparison field — and when you don't have a reference, that's the part the audit does for you.

A worked example

Illustrative arithmetic, not a customer result: chicken breast at $3.20/lb on a March invoice and $3.60/lb today is a 12.5% rise. At a 40 lb case, four orders a month, that's $64 a month — $768 a year, from one line item. The annualization rules we publish explain when to haircut a figure like that rather than quote the widest gap.

To run this across a whole invoice by hand, the self-audit method takes about an hour for your top items.