Unit Price Calculator
Enter a total price and a quantity to get the price per single unit and the price per 100 units — the shelf-label figure that lets you compare pack sizes at a glance.
Compare any pack size
Divide a pack's price by its quantity and you get a per-unit price that is directly comparable between a 500 g bag and a 1 kg box.
Match the units
Convert both packs to the same unit first — grams against grams, millilitres against millilitres — or the comparison is meaningless.
What is unit price?
Price reduced to a single unit
The unit price is how much one unit of a product costs — one gram, one millilitre, one sheet, or one piece. You find it by dividing the total price by the quantity in the pack. Because it strips away pack size, it lets you compare two products that come in different amounts and see which is genuinely cheaper.
Enter the price and the quantity to get the price per unit and the price per 100 units, ready to compare against any other pack.
Divide the total price by the quantity to get the price for one unit, then multiply by 100 for the per-100 basis that shelf labels use.
Unit price = Total price ÷ QuantitySay a bag costs 4.99 and holds 500 g. Dividing gives 4.99 ÷ 500 = 0.00998 per gram, or about 1.00 per 100 g. A rival pack at 2.99 for 250 g works out to 0.01196 per gram, or about 1.20 per 100 g — so the larger bag is the better value despite its higher sticker price.
The lower the unit price, the more product you get for your money, so when you compare two options you work out the per-unit (or per-100) price for each and pick the smaller number. The per-100 figure is usually the easiest to read because it avoids long strings of leading zeros, and it matches the "base price" (Grundpreis) printed on European shelf labels. A worked comparison makes the point: a 750 g jar at 3.49 comes to about 0.47 per 100 g, while a 400 g jar at 2.19 is roughly 0.55 per 100 g — so the bigger jar saves around 15% per gram. Watch for a gap that is too small to matter: if two unit prices land within a cent of each other, factors like freshness, brand, or storage space should decide the purchase instead.
Unit price is only one part of a buying decision.
Cheapest per unit isn't always the best buy
A lower unit price assumes you will actually use the whole pack — for perishable goods, a large bargain pack that spoils before you finish it costs more in practice. Keep the units identical on both sides of a comparison, and remember that quality, brand, and how much you really need all matter alongside the per-unit cost.