Getting prices in: units, pack sizes, and the case-vs-each trap

The prices on your invoices are easy. The units next to them are where cost guides go wrong. A distributor sells you a “case,” a recipe calls for “a cup,” and the number that connects them is doing more work than anyone admits. This guide is about entering prices so that connection is always sound.

Enter what the invoice says, then let conversion happen

The instinct is to normalize everything to one unit as you type — convert every price to “per ounce” in your head so the guide is tidy. Don't. That's exactly where the arithmetic error sneaks in, and once it's in, nothing flags it.

Instead, record each price in the unit it was quoted in. Paid $42.00 for a case? Enter 42.00 and case. Paid $3.15 a pound on the same item from another line on the invoice? That's a second price/unit pair on the same item: 3.15 and lb. When a recipe later needs 8 oz, the tool converts from the lb line automatically, because pounds and ounces are the same kind of measure.

The case-vs-each trap

A “case” is not a unit of measure. It's a packaging fact, and it only means something once you know what's inside it:

• A case of 24 × 12 oz cans is 288 oz of product — but only if the recipe uses the contents by weight.
• A case of 6 × #10 cans priced at $38 is $6.33 a can if your recipe measures in cans, or roughly $0.06 an ounce if it measures the drained contents.
• A case of 200 “each” (portioned fish, individual pastries) is price ÷ 200 per each — a clean division with no weight conversion at all.

The fix is to add the unit you actually cook in as its own line. If you buy portioned chicken by the case but plate it by the piece, record both: the case price with unit case and a per-piece price with unit each (or pc). Now a recipe that says “2 each” costs correctly, and you can still see the case price for purchasing.

Bulk-buy math: turning a lump sum into a per-unit price

Often all you know is “$76 for a 40 lb case.” The per-unit price is total ÷ pack quantity: $76 ÷ 40 = $1.90 per lb. If you then want per ounce, divide by 16 more: $0.11875 per oz. Keep the full precision — rounding to $0.12 here becomes real money across thousands of ounces a month.

In the Cost Guide tool, the small calculator next to each price does this for you: enter the case total and the pack size, and it fills in the per-unit price with the multiplication shown so you can check it.

Units the tool understands

Conversions work automatically within a category — mass to mass, volume to volume:

• Mass: oz, lb (and #), g, kg.
• Volume: fl oz, cup, pt, qt, gal, ml, l.
• Count: each, pc, ct — matched to each other but not converted to weight or volume, because the tool has no way to know what one piece weighs.

What the tool can't do is cross categories — it won't turn a price per pound into a price per cup, because that depends on the ingredient's density (a cup of flour and a cup of honey are very different weights). If a recipe measures an ingredient by volume but you buy it by weight, add a line in the volume unit with your own measured conversion.

A quick checklist for each item

• Is there a price line in the unit my recipes actually use?
• If I buy by the case, did I record what one case contains?
• Did I keep full decimal precision on per-unit prices?
• Is the vendor name on every price, so I can trace it back?

Get the units right once and the rest of the cost guide — recipe costing, food cost percentage — just works.