Unit price calculator: compare up to four pack sizes by price per kg, litre, 100 g, ounce or item to see which is cheapest and by how much.
更新于 已验证的示例：5
Item 2 is cheapest at 5.99 per kg, 14.18% less than the most expensive option.
| Item | Pack | Price | Per kg | Dearer by |
|---|---|---|---|---|
| 1 | 500 g | $3.49 | 6.98 | 16.53 % |
| 2 | 1 kg | $5.99 | 5.99 | 0 % |
500 g = 0.5 kg.
1 kg = 1 kg.
Unit price is the price divided by the size, after every pack is converted to the same unit: per kg or litre, per 100 g or 100 mL, per ounce or fluid ounce, or per item for goods sold by count. For the same product, the pack with the lowest unit price is the cheapest, and the saving is measured against the dearest pack.
With the defaults, 500 g for 3.49 costs 6.98 per kg and 1 kg for 5.99 costs 5.99 per kg, so the larger pack is 14.18% cheaper per kilogram. Packs can be entered in different units: grams, kilograms, ounces and pounds are converted with 1 oz = 28.349523125 g exactly.
Only packs sold by the same kind of measure can be compared, since weight cannot be turned into volume without the product's density. A lower unit price saves money only if you use the larger pack before it spoils.
核验来源：Python decimal: 3.49/0.5 = 6.98 per kg; (6.98 − 5.99)/6.98 = 14.18%
核验来源：Python decimal with 1 oz = 28.349523125 g (NIST): 3.49/(500/28.349523125)
核验来源：Python decimal: 4.50/(16 × 0.028349523125 kg) = 9.92080…
核验来源：Hand calculation: 3/12 = 0.25, 6.90/30 = 0.23; 0.02/0.25 = 8%
Divide the price by the quantity in the unit you want to compare. A 500 g pack at 3.49 is 3.49 ÷ 0.5 = 6.98 per kg, or 3.49 ÷ 5 = 0.698 per 100 g. Convert every pack to the same unit first; setting a price per ounce against a price per 100 g gives the wrong answer.
No. Promotions on small sizes and multipacks can reverse the usual bulk discount, so check the unit price each time. In the eggs example, 30 for 6.90 is 0.23 an egg against 0.25 for a dozen at 3.00, an 8% saving; a half-price offer on the dozen would make it the better buy at 0.125 an egg.
In the US, the Uniform Unit Pricing Regulation in NIST Handbook 130, which states can adopt, requires stores that show unit prices to use one unit for every size of a product: per kilogram, 100 g, pound or ounce for goods sold by weight; per litre, 100 mL, gallon, quart, pint or fluid ounce for liquids; per item for counted goods. EU Directive 98/6/EC sets the unit price, including VAT, per kilogram, litre, metre, square metre or cubic metre.
28.349523125 grams exactly, because the avoirdupois ounce is 1/16 of the international pound of 0.45359237 kg; NIST SP 811 lists the factor. A US fluid ounce measures volume, 29.5735295625 mL, so a price per ounce and a price per fluid ounce can only be compared if you know the product's density.
准确性取决于输入值和方法的假设。十进制运算使用50位有效数字，但估算、数值方法和源数据的精度可能较低；显示时的舍入并不能消除这些限制。 已按独立来源核验的计算示例：5。 例如，“500 g for 3.49 against 1 kg for 5.99”根据Python decimal: 3.49/0.5 = 6.98 per kg; (6.98 − 5.99)/6.98 = 14.18%进行核验。
NIST Handbook 130 — Uniform Unit Pricing Regulation; NIST SP 811 — exact conversion factors (1 oz = 28.349523125 g).
此计算器包含 5 个已解示例，答案来自独立来源。这些示例会在测试套件中运行，你也可以在此运行验证。
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