How to use this calculator
Enter at least two items you want to compare. For each item, type the name or label (optional but helpful), the total price, and the quantity or size. Select the appropriate unit from the dropdown.
Click Add Item to compare more options. The calculator instantly ranks all items from best to worst value and highlights the winner. You will also see the percentage difference between each item and the best deal.
Frequently asked questions
How do you calculate price per unit?
Divide the total price by the number of units. For example, $5.99 for 48 ounces equals about $0.125 per ounce. The lowest price per unit is the best value.
Is buying in bulk always the best deal?
Not always. Sales on smaller sizes, store coupons, and clearance items can beat bulk pricing. Always calculate rather than assume bigger means cheaper.
Can I compare items with different units?
You should convert to the same unit before comparing. For example, convert liters to ounces or kilograms to pounds first so the price per unit comparison is meaningful.
What about product quality differences?
Price per unit only measures value by quantity. Quality, brand reputation, ingredients, and personal preference all factor into whether the cheapest option is truly the best choice for you.
How much can unit price shopping save?
Consistent unit price comparison can save 15% to 30% on grocery bills. For a household spending $200 per week, that could mean $30 to $60 in weekly savings.