Use one unit on both sides
If the supplier quotes a pack price, divide by the number of comparable units in that pack. If the file supplies a list price and a discount multiplier, calculate net pack cost first: list price × multiplier ÷ units per pack = net cost per unit. Use the same currency, tax treatment, and underlying item on both sides.
In the fictional RowTune example, a coupling moves from $100 for a box of 10 to $225 for a box of 25. The box price rose 125%, yet the cost per coupling fell from $10 to $9, a 10% per-unit decrease. Approving a 125% increase from the box prices alone would reverse the conclusion.
| Fictional coupling | Old file | New file |
|---|---|---|
| Pack price | $100 | $225 |
| Units per box | 10 | 25 |
| Cost per each | $10.00 | $9.00 |
Check the basis before trusting the answer
- Same item. Confirm the supplier SKU maps to the same product and specification. A substitute needs a separate decision.
- Same underlying unit. “Each,” “box,” and “hundred” are not interchangeable. Ask for the exact conversion when the file does not say how many sellable units the pack contains.
- Same cost definition. Include the multiplier if the quoted value is a list price. Keep freight, tax, and currency treatment consistent or flag them as separate changes.
- Valid denominator. A missing or zero pack quantity means the per-unit comparison cannot be calculated. Hold the line rather than substituting one.
Try your own numbers
The calculator starts with fictional sample values. Enter the actual list price, multiplier, and pack size from both files to see the per-unit difference. Verify the source rows before using any result in an approval.
Free calculator
What changed per unit?
Compare one supplier line on the same unit basis. The fictional example starts at $100 for 10 units and moves to $225 for 25. Your numbers are calculated in this browser.
Carry the result into the review
Keep both the quoted pack price and the normalized cost per unit in the decision record. The quoted number lets a buyer trace back to the supplier file; the normalized number lets the team judge the change. Add the pack quantity and UOM to the exported review so the next person can reproduce the math.
For a full file, start with the supplier price list comparison guide. If identifiers or pack fields are missing, use the supplier price list template to request the missing data. RowTune highlights pack and unit changes for a reviewer; it does not treat every higher box price as a cost increase.