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Find the cheapest price per unit — instantly

This free unit price calculator compares cost per unit across any number of products so you always pick the best value, not just the cheapest sticker price. Enter the price, quantity and unit for each product — grams, kilograms, ounces, pounds, millilitres, litres or count — and the tool highlights the cheapest option instantly in green.

It auto-normalizes across different units: a 400 g pack, a 1 kg bag and a 16 oz box can all be compared fairly without any mental arithmetic on your part. Switch the comparison base between per 100 g, per oz, per litre or per item in one click, and the percentage premium for every non-winning product is shown right on the card.

How unit price is calculated

The formula is simple: unit price = total price ÷ quantity. A 500 g box of pasta at $3.50 has a unit price of $3.50 ÷ 500 = $0.007 per gram, or $0.70 per 100 g. A 1 kg bag at $5.00 works out to $5.00 ÷ 1000 = $0.50 per 100 g — making the larger bag the better deal, despite costing more in total.

This calculator does that arithmetic for all your products simultaneously. Add as many products as you like, change any value, and the results update in real time — no submit button, no page reload, and nothing uploaded to any server.

Unit normalization: compare grams, kilograms, ounces and more

Different retailers label identical products in different units — one might sell olive oil in 750 ml bottles, another in 25.4 fl oz bottles. Without converting to a common unit first, a fair price comparison is impossible. Enter both products here, select the right unit for each, and the tool converts everything to the same base automatically.

Supported weight units: grams (g), kilograms (kg), ounces (oz) and pounds (lb). Supported volume units: millilitres (ml), litres (L) and fluid ounces (fl oz). A count mode (each/item) handles anything sold by the piece — batteries, tablets, sachets or rolls of paper towel.

Grocery shopping and the bulk-buy myth

Bulk packs often offer a lower price per unit — but not always. Premium brands sometimes charge more per 100 g in their largest size than mid-size alternatives at the same store. At warehouse clubs like Costco and Sam's Club, shelf labels frequently skip per-unit pricing entirely, leaving you to do the math in your head or trust that bigger means cheaper. It often doesn't.

Before reaching for the biggest size, enter both options here. The per-unit result and the percentage difference make the real saving (or lack of saving) immediately clear. For frequently purchased household staples, always choosing the lower unit price can add up to a meaningful annual difference.

How this compares to ShopSavvy, Basket, and store shelf labels

Apps like ShopSavvy and Basket are built for tracking a running grocery list or finding the same barcode across multiple stores — a different job from comparing pack sizes within one store. Neither app normalizes unit prices across sizes in the way this calculator does; to compare a 400 g vs 1 kg bag in Basket, you'd have to add both to separate lists and do the arithmetic yourself.

Store shelf labels are legally required to show unit prices in the EU, UK, and most of Australia, but US retailers apply this inconsistently. Labels sometimes use different base units for similar products (one brand might show 'per 100 g', another 'per oz'), making a direct comparison impossible at a glance. This calculator bridges that gap: enter any unit, get a normalized comparison in seconds, right from your phone browser — no app, no account, no barcode scanner needed.

Free, private and works offline

There's nothing to install and no account to create. Every calculation runs locally in your browser using JavaScript — your prices are never uploaded to any server, stored in a database, or shared with anyone. Once the page has loaded, the calculator works without an internet connection, so you can use it right at the supermarket shelf.

Bookmark this unit price calculator and reach for it any time you want to compare grocery prices, check whether a sale is actually a deal, or verify which pack size gives the best value for your household.

The psychology of pack pricing: anchoring, decoys, and shrinkflation

Retailers deploy several pricing techniques that exploit cognitive shortcuts. Price anchoring places an oversized value pack alongside standard sizes so the large pack feels like an obvious bargain — even when the unit price difference is marginal. The decoy effect is even more deliberate: in a three-tier range (small, medium, large), the medium is frequently priced so that the large appears to offer dramatically better value, steering most shoppers toward the highest-margin SKU. Once you calculate the actual price per 100 g across all three, the difference often shrinks to a few cents.

Loss leader unit pricing applies the same logic in reverse. A retailer may sell a staple like milk or eggs at a genuine per-unit loss to draw foot traffic, knowing that shoppers who enter for the loss leader will fill their basket with higher-margin items. The bargain on the entry product is real; the overall basket price may not be. Comparing unit prices item by item is the only defence.

Shrinkflation is a manufacturer's alternative to raising the sticker price: the package stays the same shape, the price stays identical, but the net weight quietly drops — from 200 g to 180 g, for instance. The unit price rises invisibly. Only someone tracking price per 100 g over successive shopping trips will catch it. Saving your benchmark unit prices from a previous shop and comparing them on the next visit is the simplest way to detect shrinkflation in products you buy regularly.

Unit pricing regulations: EU, UK and the patchwork US rules

In the European Union, EU Directive 98/6/EC requires retailers to display the selling price and the unit price for all products offered to consumers. The unit price must be expressed per kilogram, litre, metre, square metre, or cubic metre as appropriate — and it must appear in the same field of vision as the selling price. Member states that fail to implement the Directive face infringement proceedings, so compliance across EU supermarkets is generally high. The UK retained equivalent obligations after Brexit through the Price Marking Order 2004, which continues to require unit prices on most pre-packaged and loose goods sold from retail premises.

In the United States the picture is more fragmented. The federal Fair Packaging and Labeling Act mandates net quantity declarations on packaging but does not require retailers to display a unit price on the shelf label. A handful of states — including California, Connecticut, Massachusetts, New York, and Vermont — have enacted their own unit pricing laws, but requirements vary: which product categories must carry unit prices, what base unit to use, and whether online listings are covered all differ by state. The Federal Trade Commission provides guidance but no federal shelf-label mandate exists. This regulatory gap is precisely why a browser-based unit price calculator is more useful in an American store than anywhere else.

Australia sits between the two extremes. The Unit Pricing Code — mandatory for grocery retailers with floor space above 1,000 m² — requires a unit price expressed in dollars per kilogram, litre, or per unit for small items. Smaller independent retailers are exempt, which again creates gaps the shopper must bridge manually. Wherever shelf labels are inconsistent or absent, entering the price and weight from the front of the pack into this calculator gives you a trustworthy comparison in seconds.

Total cost of ownership and the bulk-buying risk for consumables

A low unit price is not always the full picture. Total cost of ownership matters most for consumables that come bundled with a durable: printer ink is the canonical example. A budget inkjet printer may cost $40 and seem excellent value, but its proprietary cartridges might yield 200 pages each and cost $18 a set — a cost per page of around $0.09. A mid-range laser printer at $180 uses toner cartridges that yield 2,000 pages at $25 each, dropping the per-page cost to $0.0125. Over a three-year lifecycle at 1,500 pages a year, the cheap printer costs $40 + (22.5 × $18) = $445; the laser costs $180 + (2.25 × $25) = $236. The higher upfront price is cheaper by hundreds of dollars once consumable unit costs are factored in.

The same logic applies to subscription vs one-time purchase comparisons. A razor sold as a handle-plus-blade starter kit may show an attractive unit price per blade, but a subscription auto-delivers blades at a premium that quickly exceeds the cost of buying multi-packs outright. Divide the annual subscription cost by the number of blades delivered, then compare that to the supermarket shelf unit price — the difference is often 30–60%.

Bulk-buying risk adds a dimension that pure unit-price arithmetic ignores. Perishable goods — fresh produce, dairy, bread — expire before a large household can consume them, turning paper savings into literal waste. Fashion or trend items bought speculatively in bulk (seasonal foods, craft supplies, specific flavours) carry the risk of changing preferences. The real unit cost of a 5 kg bag of flour that half-spoils is not $0.60 per 100 g; it is closer to $1.20. A realistic consumption estimate over the product's shelf life is the most important variable in any bulk-buy decision.

Weight, volume and count: when the unit on the label deceives

Not all unit prices can be compared directly even when they share the same unit type. Net weight vs drained weight is the most common trap with canned goods: a 400 g tin of chickpeas listed at 400 g may contain only 240 g of actual chickpeas once the brine or liquid is drained away. A competing brand might show 240 g net drained weight explicitly. On a raw-weight basis the first tin appears cheaper per gram; on a drained-weight basis the two are identical. Always check whether the weight on the label refers to the complete contents — including liquid — or just the edible solid portion.

Liquid concentrates present a mirror-image problem. A bottle of concentrated cleaning fluid or cordial that costs $4.00 for 500 ml looks expensive against a ready-to-use competitor at $2.50 for 1 L. But if the concentrate dilutes 1:4 with water to make 2.5 L of usable product, its effective unit price is $4.00 ÷ 2,500 = $0.16 per 100 ml — against the ready-to-use product's $2.50 ÷ 1,000 = $0.25 per 100 ml. Comparing the label volumes without accounting for dilution ratio inverts the true value relationship entirely.

Snack foods sold by weight add yet another layer: a 150 g bag of crisps and a 150 g bag of a competing brand carry identical weight-based unit prices, but one manufacturer may fill the bag with less product and more nitrogen cushioning. In this case count-based comparison — cost per crisp or per serving as declared on the nutrition panel — is a more honest measure. Whenever weight, volume and count are all plausible bases for comparison, choose the unit that most closely reflects how you actually consume the product, then apply that unit consistently across every option you're comparing.