Bigger isn't always cheaper
A larger box can cost more per ounce or item. Compare the unit price instead of trusting the displayed quantity.
Shop with the math done
Which Deal's Better?
Compare prices and sizes. Find the better deal in seconds.
Unit price calculator
Compare your deals
Enter each product's price, quantity, and unit. If it contains several items, turn on the multipack option.
Compare up to 5 deals
Enter the price and quantity for both deals to see which one wins.
The simple idea
How to compare unit prices
Unit price strips away quantity confusion. For a regular product, divide the price by its quantity. For a multipack, first multiply the number of items in the pack by the quantity per item.
Price ÷ total quantity = unit price
Multipacks made easy
Turn on the multipack option for 24 cans × 12 fl oz or 12 rolls × 150 sheets. Enter the number of items in the pack and quantity per item; we calculate the total.
Different units, normalized
Compare oz with lb, g with kg, and mL with L. Compatible measures convert automatically.
Real shopping situations
Comparing sale bundles
For “2 for $10,” enter $10 as the price, turn on the multipack option, and enter 2 as the number of items in the pack. Do the same for “3 for $14.” Enter how much each item contains under “Quantity per item.”
Compare like with like
The calculator compares compatible units and warns you when they describe different things. Weight cannot be fairly compared with volume, for example. Shopper-friendly units such as pods, rolls, sheets, bottles, and cans are treated as comparable individual items.
Questions, answered
Frequently asked questions
What is unit price?
Unit price is the cost of one standard unit—such as one ounce, item, or milliliter. It makes differently sized packages easier to compare.
How do I compare products with different quantities?
Enter the price, quantity, and unit for each option. For a multipack, turn on “This is a multipack,” then enter the number of items in the pack and the quantity per item.
Can I compare ounces and pounds?
Yes. Ounces and pounds are converted to a shared unit automatically.
Can I compare grams and kilograms?
Yes. Kilograms are converted to grams before the prices are compared.
Can I compare liters and milliliters?
Yes. Liters, milliliters, and U.S. liquid-volume units can be compared automatically.
Can I compare multipacks?
Yes. Turn on “This is a multipack,” then enter the number of items in the pack and the quantity per item. The calculator multiplies them automatically.
Can I compare more than two products?
Yes. Add up to five deals and the calculator will rank their unit prices.
Does a larger package always cost less?
No. Promotions, brand pricing, and package design can make a smaller option cheaper per unit.
Does the calculator save my shopping information?
No. Your calculator entries are processed locally in your browser and are not sent to our server. No account is required.