Unit price calculator: which package is the better deal?
Enter the price and size of two packages in the same unit. $12.50 for 8 units is $1.5625 each; $9.00 for 6 units is $1.50 each, so the second package is 4% cheaper per unit.
Inputs used by this calculator
Unit Price Calculator uses the fields below. The starting values reproduce the page example; replace them with values from the same units and time period before using the result.
| Input | Starting example | Accepted value | How it is used |
|---|---|---|---|
| Package A price | 12.5 | 0 or greater | Supplies the package a price quantity used by the published equation or result breakdown. |
| Package A quantity (ounces, count or any unit) | 8 | 0 or greater | Selects the unit or conversion path used by Unit Price Calculator. |
| Package B price | 9 | 0 or greater | Supplies the package b price quantity used by the published equation or result breakdown. |
| Package B quantity (same unit as A) | 6 | 0 or greater | Selects the unit or conversion path used by Unit Price Calculator. |
Why unit price matters
Packages come in different sizes, so the sticker price alone does not show which is cheaper. Unit price divides the price by the quantity to give the cost per ounce, per count or per pound. Many grocery shelves show unit prices, and NIST publishes a uniform unit pricing regulation that states can adopt.
How to compare two packages
Enter both packages in the same unit: ounces with ounces, counts with counts. The lower price per unit is the better value. The result shows how much cheaper it is per unit and what you save buying the larger quantity at the better price.
unit price = price ÷ quantityBigger is not always cheaper
Larger packages often cost less per unit, but not always, especially when a smaller size is on sale. Store brands, multipacks and coupons change the picture. Compare the unit prices, and only buy the larger size if you will use it before it spoils.
Match the units
Shelf tags sometimes show one product per ounce and another per pound or per count. Convert first: 16 ounces make a pound, and fluid ounces measure volume, not weight. Comparing mismatched units is the most common mistake.
Sales, coupons and multi-buy deals
Enter the price you will actually pay after discounts. For “2 for $5” offers, enter $5 and twice the size. If a coupon requires buying more than you need, include only the quantity you will use.
Price per ounce and per pound
| Package | Per ounce | Per pound |
|---|---|---|
| 12 oz for $3.49 | $0.291 per oz | $4.65 per lb |
| 18 oz for $4.99 | $0.277 per oz | $4.44 per lb |
| 32 oz for $7.99 | $0.250 per oz | $4.00 per lb |
| 64 oz for $16.49 | $0.258 per oz | $4.12 per lb |
Frequently asked questions
How do I calculate unit price?
Divide the package price by the quantity.
How do I know which package is the better deal?
Compare the unit prices; the lower one is the better value.
Is the bigger package always cheaper?
No. Sales and store brands can make a smaller package cheaper per unit.
What unit should I use?
Any unit, as long as both packages use the same one.
How many ounces are in a pound?
16 ounces (weight).
Should I include coupons?
Yes. Enter the price you will actually pay.
Why does the shelf tag differ slightly?
Shelf tags round unit prices; the calculator keeps full precision.
What to keep in mind
Use matching quantities when comparing packages. Discounts are included only if you enter the adjusted price.
Results are rounded for display in US format, with money in dollars and cents; CSV exports keep full calculation precision. This is a calculation summary, not an official certificate.