Unit Price Calculator

Unit price tells you how much a product costs for one standardized unit of quantity. The basic calculation is:

For example, if four identical items cost 12:

The same idea applies to products sold by weight, volume or length. However, when package sizes use different units, those quantities must first be converted to the same measurement basis.

Looking only at the shelf price can be misleading. A larger package can cost more overall while still having a lower price per unit.

For example:

Product B has the lower unit price in this example even though its total purchase price is higher.

The comparison mode converts compatible quantities to a common unit before comparing them, so 500 g can be compared with 1 kg, 16 oz with 1 lb, or 750 mL with 1 L.

Compatible units can be converted for comparison. Count-based items cannot be meaningfully converted into weight, volume or length without additional product information.

Choose item when the package contains a known number of comparable individual units, such as 12 cans, 6 batteries or 24 bottles.

Choose a weight unit such as grams or kilograms when the meaningful quantity is product weight. This is often more useful for foods, ingredients and bulk materials.

For liquids, use milliliters or liters. For products sold by length, such as cable, rope, fabric or some construction materials, use centimeters or meters.

The best comparison basis is normally the quantity that represents what you are actually receiving.

• Comparing small and large supermarket packages
• Checking whether a bulk pack actually offers a lower unit cost
• Comparing different bottle or container sizes
• Evaluating multipacks sold at different total prices
• Comparing supplier quotations with different package quantities
• Checking price per kilogram, liter, item or meter
• Comparing sale prices when package sizes differ

For percentage reductions from a normal selling price, use the Discount Calculator.

A lower unit price tells you which option costs less for the same amount, but price is only one part of a buying decision.

A larger package may be cheaper per unit but still be unsuitable if you will not use the product before it expires, if storage is limited, or if you need to spend substantially more upfront.

Product quality, brand, specification, warranty, delivery cost, taxes, discount eligibility and other charges can also differ between products. Compare like with like before treating the lower unit price as the better overall purchase.

The currency selector changes how monetary results are labeled. It does not convert between currencies or use live exchange rates. Both products in comparison mode should therefore be priced in the same currency.

Measurement conversions are handled only between compatible units: grams and kilograms, ounces and pounds, milliliters and liters, or centimeters and meters.

The calculator does not convert weight into volume because that would require information such as the density of the specific product.

The unit-price calculation on this page is designed to run in your browser using JavaScript. Prices and quantities entered into the tool are used directly on the page to calculate and compare unit costs.

No account is required. For an actual purchase or procurement decision, confirm the current price, package quantity, taxes, delivery charges and product specifications with the seller or supplier.

Important: Unit price is a mathematical comparison of cost per quantity. It does not account automatically for product quality, expiry, shipping, taxes, rebates, membership discounts or other purchase conditions.