Free Online Unit Price Calculator
Compare products by price per unit, ounce, gram, or liter.
| Product | Price | Quantity | Unit | Price per unit | Normalized price | Actions |
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Prices are treated as US dollars for display. Mixed weight and volume rows cannot be compared directly, so the best value is highlighted within each measurement type.
About the Unit Price Calculator
Unit price is the cost of one standard measure of a product. It is the fairest way to compare packages of different sizes, because the sticker price alone hides how much product you actually get. This calculator takes a name, price, quantity, and unit for each product, then computes both the price per entered unit and a normalized price per kilogram, per liter, or per item. The best value is highlighted automatically.
Why the sticker price is misleading
Two bags of coffee might cost $8.99 and $15.49. At first glance the smaller bag looks cheaper, but if the first contains 500 grams and the second contains a full kilogram, the larger bag costs $15.49 per kilogram while the smaller costs $17.98 per kilogram. The unit price reverses that conclusion. The same logic applies to cereal, detergent, rice, paint, printer ink, and anything else sold in more than one package size.
How normalization works
Weight units are converted to kilograms and volume units are converted to liters. One kilogram equals 1000 grams, one ounce equals about 28.3495 grams, and one pound equals about 453.592 grams. One liter equals 1000 milliliters, one US fluid ounce equals about 29.5735 milliliters, and a gallon contains 128 fluid ounces. The normalized price is the total price divided by the quantity expressed in the base unit. Items sold by count use a base of one item.
Comparing the same kind of product
Unit price only makes sense within the same dimension. Comparing dollars per kilogram with dollars per liter is meaningless unless you know the density of the product. This tool groups comparisons by dimension: weight rows compete with weight rows, volume rows with volume rows, and counted items with counted items. When only one dimension is present, a single winner is highlighted. When several dimensions are present, the cheapest option in each dimension is highlighted and the summary explains why they are not ranked together.
Accuracy and rounding
The calculation keeps full floating-point precision and rounds only the displayed values. Very small unit prices, such as a fraction of a cent per gram, are shown with extra significant digits instead of being rounded to zero. The savings figure compares the cheapest and most expensive normalized prices in the same dimension. It answers the question: how much would you save by choosing the best package instead of the worst one?
Frequently asked questions
What if the package has a discount or coupon?
Enter the final price you actually pay after the discount. The unit price is based on the entered price, so using the out-the-door price keeps the comparison accurate.
Can I compare fresh produce sold by weight with packaged goods?
Yes, as long as both use weight units. Enter pounds or ounces for each item and the calculator converts them to a common price per kilogram.
Why can't I compare coffee per kilogram with milk per liter?
Weight and volume measure different physical properties. Without a density conversion, one kilogram of coffee and one liter of milk are not equivalent amounts, so ranking them would be misleading.