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Price Per Unit Calculator & Value Comparator

Instantly compare prices of products with different sizes, weights, and units. Identify the best value option and calculate savings percentages. Supports Mass, Volume, Length, and Count.

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About

In an era of fluctuating prices and "shrinkflation," determining the true cost of a product is increasingly difficult. Retailers often mask price increases by slightly reducing package sizes or using non-standard units (e.g., listing one detergent in fl oz and another in liters). This creates a cognitive load that makes mental comparison nearly impossible during a quick shopping trip.

The Price Per Unit Calculator eliminates this ambiguity by normalizing all products to a common base line. Whether you are comparing bulk grains (lb vs kg), liquids, or multi-pack items, this tool reveals the mathematical winner. By focusing on the Price/Unit ratio, you ensure maximum purchasing power efficiency.

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Reference Data

CategoryUnit NameSymbolBase Conversion (Approx)
MassKilogramkg1000 g
MassPoundlb≈ 453.59 g
MassOunceoz≈ 28.35 g
VolumeGallon (US)gal≈ 3.785 L
VolumeFluid Ounce (US)fl oz≈ 29.57 ml
LengthYardyd0.9144 m
CountGrossgr144 items
CountReamrm500 sheets

Frequently Asked Questions

Generally, no. Comparing a Liquid (measured in volume, like Liters) to a Solid (measured in mass, like Kilograms) requires knowing the density of the substance. However, for water-based products, 1 Liter is approximately 1 Kilogram. This tool categorizes units (Mass, Volume, Length) and will warn you if you attempt to compare mismatched categories.
Shelf tags often use arbitrary units (e.g., "Price per 100g" vs 'Price per lb'). This tool normalizes everything to a single base unit (like "Per 1 unit" or 'Per 1 kg') to give you a strictly mathematical "apples-to-apples" comparison that might differ from the store's simplified display.
Yes. If you have a "Buy One Get One Free" offer, simply enter the Total Price for one item (since you pay for one) but double the Quantity. For "Buy One Get One 50% Off", enter the combined price of both items and the combined quantity.
The "Best Value" is determined solely by the lowest cost per normalized unit. It does not account for product quality, expiration dates, or brand preference. It is a strictly financial metric.